SPHINGIDAE OF THE UNITED STATES OF AMERICA

Pachysphinx occidentalis

(Edwards, 1875)

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Common Name: Western Poplar Sphinx

Ecology and Life History: This moth is found from May through October through most of its range. In Arizona, it is associated with the July/August monsoon season. It is heavily attracted to light, with both sexes being attracted. Males seem to fly more readily to light. Males tend to be slightly smaller than females, but not excessively so. Eggs are laid in small clusters on either surface of a leaf (2). Larvae are solitary feeders, despite the egg laying habits of the adults.

Habitat and Searching for Larvae: Larvae are most easily encountered on Cottonwood (Populus fremontii) or Aspens (Populus spp.). Tuttle notes that searching streambeds for frass often reveals the location of larvae in adjacent Populus (2). This species likely has larvae that fluoresce under ultraviolet light.

Rearing Notes: Eggs are readily deposited in paper bags with no addition of hostplant needed. Reports of this species on Salix may be accurate, but most larvae refuse this plant in captivity (2). Larvae take well to being sleeved, and as such are easy to rear using that method (2). Pupation occurs fairly deep underground (2).

Adult Description: This is a large moth, forewings are between 51-71mm in length (2). The large scalloped forewings are light yellow-gray and brown with a white reniform spot. In the similar Pachysphinx modesta, the forewings tend to be a grayer color, and overall darker. The hindwings of this species are red with a blue marking in the anal angle. The blue marking is not very well defined and quite light. It appears bisected by two black lines. In Pachysphinx modesta, the anal angle is much darker blue and has a distinctive triangular black shape on the top rather than the bisected appearance of P. occidentalis.
​

Larval Description: This is a large green larva with 7 white diagonal stripes on the side. The stripes are just slightly above the red spiracles and the last stripe is thicker and leads to the white horn. The head capsule of this species is green with a thick white border. The similar in appearance Pachysphinx modesta is more blue-green and has a significantly shorter caudal horn. Pachysphinx modesta larvae are also stippled with white setae whereas P. occidentalis lacks these (2).

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Picture
(C) Eric Eaton
Picture
Picture
The gallery to the left contains photos of Pachysphinx occidentalis adults. If you have a photo that you would like to submit to us, please contact us.

The gallery to the right contains photos of Pachysphinx occidentalis larval and pupal stages. If you have a photo that you would like to submit to us, please contact us.
L3 - (C) Alex Baranowski
L1 - (C) Teá Montagna
L1 - (C) Teá Montagna
L2 - (C) Teá Montagna
L3 - (C) Teá Montagna
L4 - (C) Teá Montagna
L4 - (C) Teá Montagna
L5 - (C) Teá Montagna
L2 - (C) Teá Montagna
Pupa - (C) Teá Montagna
Pupa - (C) Teá Montagna
Pupa - (C) Teá Montagna

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Macroglossinae

Aellopos clavipes
Aellopos fadus
Aellopos tantalus
Aellopos titan
Amphion floridensis
Cautethia grotei
Callionima falcifera
Callionima parce
Darapsa choerilus
Darapsa myron
Darapsa versicolor
Deidemia inscriptum
Enyo lugubris
Enyo ocypete
Erinnyis alope
Erinnyis crameri
Erinnyis ello
Erinnyis guttularis
Erinnyis lassauxii
Erinnyis oenotrus
Erinnyis obscura
Eumorpha achemon
Eumorpha fasciatus
Eumorpha intermedia
Eumorpha labruscae
Eumorpha pandorus
Eumorpha satellitia
Eumorpha vitis
Eumorpha typhon
Eupyrrhoglossum sagra​
Hemaris diffinis
Hemaris gracilis
Hemaris thysbe
Hyles euphorbiae
Hyles gallii
Hyles lineata
Madoryx pseudothyreus
Pachylioides resumens
Pachylia ficus
Perigonia lusca
Phryxus caicus
Proserpinus flavofasciata
Proserpinus juanita
Proserpinus gaurae
Proserpinus lucidus
Pseudosphinx tetrio
Sphecodina abbottii
Xylophanes falco
Xylophanes pluto
Xylophanes libya
Xylophanes porcus
Xylophanes tersa

Smerinthinae

Protambulyx strigilis
Amorpha juglandis
Pachysphinx modesta
Pachysphinx occidentalis
Paonias astylus
Paonias excaecata
Paonias myops
Smerinthus cerisyi
Smerinthus jamaicensis

Sphinginae

Agrius cingulata
Ceratomia amyntor
Ceratomia catalpae
Ceratomia hageni
Ceratomia undulosa
Cocytius antaeus
Cocytius duponchel
Dolba hyloeus
Isoparce cupressi
Lapara bombycoides
Lapara coniferarum
Lintneria istar
Lintneria separatus
Lintneria eremitus
Manduca jasminearum
Manduca occulta
Manduca brontes cubensis
Manduca florestan
Manduca muscosa
Manduca quinquemaculatus
Manduca rustica
Manduca sexta
Neococytius cluentius
Paratrea plebeja
Sphinx canadensis
Sphinx chersis
Sphinx dollii
Sphinx drupiferarum
Sphinx frankii
Sphinx gordius
Sphinx kalmiae
Sphinx leucophaeata
Sphinx luscitiosa
Sphinx pinastri
Sphinx poecila 
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  • Home
  • Sphingidae Index
    • Macroglossinae >
      • Aellopos >
        • Aellopos clavipes
        • Aellopos fadus
        • Aellopos tantalus
        • Aellopos titan
      • Amphion >
        • Amphion floridensis
      • Callionima >
        • Callionima falcifera
        • Callionima parce
      • Cautethia >
        • Cautethia grotei
      • Darapsa >
        • Darapsa versicolor
        • Darapsa myron
        • Darapsa choerilus
      • Deidamia >
        • Deidamia inscriptum
      • Enyo >
        • Enyo lugubris
        • Enyo ocypete
      • Erinnyis >
        • Erinnyis alope
        • Erinnyis crameri
        • Erinnyis ello
        • Erinnyis guttularis
        • Erinnyis lassauxii
        • Erinnyis oenotrus
        • Erinnyis obscura
      • Eumorpha >
        • Eumorpha pandorus
        • Eumorpha achemon
        • Eumorpha fasciatus
        • Eumorpha satellitia
        • Eumorpha labruscae
        • Eumorpha intermedia
        • Eumorpha vitis
        • Eumorpha typhon
      • Eupyrrhoglossum >
        • Eupyrrhoglossum sagra
      • Hemaris >
        • Hemaris thysbe
        • Hemaris gracilis
        • Hemaris diffinis
        • Hemaris aethra
      • Hyles >
        • Hyles gallii
        • Hyles euphorbiae
        • Hyles lineata
      • Madoryx >
        • Madoryx pseudothyreus
      • Pachylioides >
        • Pachylioides resumens
      • Pachylia >
        • Pachylia ficus
      • Phryxus >
        • Phryxus caicus
      • Perigonia >
        • Perigonia lusca
      • Proserpinus >
        • Proserpinus juanita
        • Proserpinus flavofasciata
        • Proserpinus gaurae
        • Proserpinus lucidus
        • Proserpinus terlooii
      • Pseudosphinx >
        • Pseudosphinx tetrio
      • Sphecodina >
        • Sphecodina abbottii
      • Xylophanes >
        • Xylophanes falco
        • Xylophanes libya
        • Xylophanes pluto
        • Xylophanes porcus
        • Xylophanes tersa
    • Smerinthinae >
      • Amorpha >
        • Amorpha juglandis
      • Pachysphinx >
        • Pachysphinx modesta
        • Pachysphinx occidentalis
      • Paonias >
        • Paonias excaecata
        • Paonias myops
        • Paonias astylus
      • Protambulyx >
        • Protambulyx strigilis
      • Smerinthus >
        • Smerinthus jamaicensis
        • Smerinthus cerisyi
    • Sphinginae >
      • Agrius >
        • Agrius cingulata
      • Ceratomia >
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        • Ceratomia hageni
        • Ceratomia undulosa
        • Ceratomia catalpae
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        • Cocytius antaeus
        • Cocytius duponchel
      • Dolba >
        • Dolba hyloeus
      • Isoparce >
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      • Lapara >
        • Lapara coniferarum
        • Lapara bombycoides
      • Lintneria >
        • Lintneria eremitus
        • Lintneria istar
        • Lintneria separatus
      • Manduca >
        • Manduca brontes cubensis
        • Manduca jasminearum
        • Manduca muscosa
        • Manduca occulta
        • Manduca florestan
        • Manduca quinquemaculatus
        • Manduca rustica
        • Manduca sexta
      • Neococytius >
        • Neococytius cluentius
      • Paratrea >
        • Paratrea plebeja
      • Sphinx >
        • Sphinx canadensis
        • Sphinx chersis
        • Sphinx dollii
        • Sphinx drupiferarum
        • Sphinx franckii
        • Sphinx kalmiae
        • Sphinx leucophaeata
        • Sphinx luscitiosa
        • Sphinx poecila
        • Sphinx gordius
        • Sphinx pinastri
  • Final Instar Larva Key
  • Hostplant Index
  • Parasitoids and Predators
  • Range
  • General Information
  • Sources and Acknowledgements
  • Other Resources
    • Sphingidae Publication Library
  • Store
  • Donations