LEPIDOPTERA 



603 



A. Anal veins of the fore wings united near the margin of the wing by a cross- 

 vein HY POPTIN^ 



AA. Anal veins of the fore wings not united near the margin of the wing by a 

 cross-vein. 

 B. Veins Rs and Mi of the hind wings stalked or close together at the end of the 



discal cell ; antennae of male pectinate throughout Cossin.e 



BB. Veins Rs and Mi of the hind wings widely separate; antennas of male 



pectinate on basal half only Zeuzerin^ 



Subfamily Hypoptin^. — The members of this subfamily are dis- 

 tinguished by the presence of the anal cross-vein near the margin of 

 the front wings . 

 Nearly one-half our 

 species belong to this 

 subfamily. They 

 have been described 

 from Florida, Texas, 

 Colorado, and west- 

 ward to California. I 

 have found no ac- 

 count of the early 

 stages of any of them. 



Subfamily Cos- 

 sin^. — This subfam- 

 ily is represented in 

 our feunaby six gen- Fig. 728.— Prionoxystus robinia, female, 



era including fourteen 



species ; but most of these are confined to the Far West and are known 

 only in the adult state. Our best-known species are the following. 



The locust-tree carpenter-moth, PrionoxystMs rohmics. — Figure 728 

 represents the female, natural size. The male is but little more than 

 half as large as the female. It is much darker than the female, from 

 which it differs also in having a large yellow spot, which nearly covers 

 the outer half of the hind wings. The moths fly in June and July ; 

 the larvae bore in the trunks of locust, oak, poplar, willow, and other 

 trees. It is supposed that the species requires three years to complete 

 its transformations. It is found from the Atlantic Coast to California. 



The lesser oak carpentev-worm, Prio7toxyshis macmurtrei. — This is 

 a slightly smaller species than the preceding. The lan^a bores in the 

 trunks of oak in the East. The moth has thin, slightly transparent 

 wings, which are crossed by numerous black lines. The male is much 

 smaller than that of P. rohinice, and lacks the yellow spot on the hind 

 wings. 



Subfamily Zeuzerin^. — ^Excepting three little-known species of 

 Hamilcara, found in Texas and Arizona, the following species is the 

 only representative of this subfamily in our fauna. 



The leopard-moth, Zeuzera pyrma. — This species is white, spotted 

 with nimierous small, black spots, which suggested its common name. 

 The adult has a wing-expanse of from 40 to 60 mm. It is a European 



