598 On Synthetic Types in Insects. 



chotes * (Fig. 2). Thus, so far as we know, this en- 

 largement of these two praescuta is unique in Gorgopis 

 among Lepidoptera, though common in the Neuroptera. 



There is also a strong resemblance in the flanks of the 

 three thoracic rings, which in both insects are vertical. In 

 this respect the Bombyces differ from the families below 

 them ; thus in the NoctucB they are a little inclined, still 

 more so in the Geomctrcc, and in the Tineidce they are in- 

 clined at a still lower angle, and are very slender. So the 

 Phryganidae, the analogues among Neuroptera, of the 

 Tineid.v, have their flanks inclined at a like angle, be- 

 sides being much slenderer than usual. In the large coxae 

 and small trochanters and general corres])ondence of the 

 size of the legs, Gorgopis agrees tolerably with its analogue. 

 But in the wings, and even to the neuration, the analogy is 

 well sustained : in the primaries of both insects the costa 

 is straight to near the apex, where it rounds slowly down- 

 wards, terminating in an obtusely pointed, somewiiat 

 produced apex ; the outer edge is very oblique, and the 

 inner angle in both insects is much nearer the middle of 

 the wing than usual. Also in the wings of both genera 

 the distance between the marginal and costal nervures 

 is greater tiian usual ; and what is an anomaly in Lepi- 

 doptera is the presence of a short recurrent nervule or 

 spur, (Fig. 3, «,) which the costal sends off from its base 

 across to the marginal nervure. The great number of 



* The outline of the wings of Gorgopis is well shown in Dr. Harris's fig. 202; 

 though in a fine species discovered by Mr. Scudder at the base of Mount Wash- 

 ington during the past summer the wings are still narrower and longer, approach- 

 ing still more exactly the form of those of rolysta>cliotes. This species, which 

 I have called ;^Mr/>«rascen5, differs from the other species, which is sable or lawny 

 brown, in being washed with a purplish tint. lUit the neuration of this genus 

 is very close to that of Ilepialus, of wiiicli I give a figure from a prejjaratiou in 

 the collections of the Museum of Comparative Zoillogy at Cambridge. 



Through Mr. Scuddcr's kindness T can give a figure to illustrate the anomalous 

 apipcarancc of the pra-scutum of the two hinder rings of tlic thorax in H.pnr- 

 pweisceiis, since the single specimen, otiicrwise well preserved, wsis denuded 

 upon the notum of the thorax. 



