''Euproserpinus phaeton'', the Phaeton primrose sphinx moth, is a moth of the family Sphingidae. the species was first described by Augustus Radcliffe Grote and Herbert C. Robinson in 1865. It is found in North America from California south to

Baja California Sur Baja California Sur (; 'South Lower California'), officially the Free and Sovereign State of Baja California Sur ( es, Estado Libre y Soberano de Baja California Sur), is the least populated state and the 31st admitted state of the 32 federal ent ...

and further into Mexico. It has also been reported in south-western Arizona. The length of the forewings is 32–42 mm. The abdomen upperside has creamy white side-tufts and a discontinuous dorsal white band. The forewing upperside has a median area which is mainly lacking transverse lines. The hindwing upperside has a straight marginal black band with some black scales. The hindwing underside is lacking black basally. Adults fly swiftly and close to the ground over dry washes and flat areas in deserts. There is one generation with adults on wing from February to April. Adults nectar at flowers during the day. The larvae feed on various Onagraceae species.

References

Euproserpinus Moths of North America Lepidoptera of Mexico Fauna of the Colorado Desert Fauna of the Sonoran Desert Fauna of the Baja California Peninsula Natural history of Baja California Natural history of Baja California Sur Natural history of the California chaparral and woodlands Moths described in 1865 Taxa named by Augustus Radcliffe Grote Taxa named by Herbert C. Robinson {{Macroglossini-stub