NATURAL SCIENCES OF PHILADELPHIA. 217 



In the hind wings the costal nervure has a rather long fork. The intercos- 

 tal branch exterior to the cell and extremely short, and from this point poste- 

 riorly the stalks of the two nervures are almost in contact. The median ner- 

 vure four-branched, the superior on a moderate peduncle. 



The structural differences between this and the foregoing genus are : the 

 labial palpi slenderer ; third joint very short, about one-third as long as the 

 second, which is squamous beneath. Maxillary palpi slender, smooth, por- 

 rected ; with tips equal to the end of the second joint. Tongue scaled at the 

 base, at least one-half as long as the body. The length of the middle tibiae and 

 tarsus equal to that of the body ; the hind tibiae and tarsus exceeding the 

 length of the body. 



H. ? formosalis . Fore wings pale yellow, with three white patches on 

 the disk, the two nearest the base small and slightly margined with fuscous, 

 the one on the end of the disk margined internally by an oblique fuscous line ; 

 a white patch on the nervules behind the disk, margined externally by a fus- 

 cous line convex toward the base of the wing and hooked at each end, with a 

 white patch at the tip and one beneath it at the inner angle, both margined 

 externally by a submarginal curved fuscous line. In the middle of the sub- 

 median interspace is a nearly oval white patch encircled with fuscous. Hind 

 wings white, pale yellowish beyond the middle, with a fuscous line near the 

 base from the inner margin, not extended to the costa ; a wavy double line of 

 the same hue rather external to the middle, and a white spot near the tip and 

 one about the middle of the hinder margin, both margined externally with a 

 fuscous line. On the disk is a pale yellowish spot. 



Lake Teedyuscong. Imago, July. 



Cataclysta Herrich-Schaffer. 



Fore wings with the first subcosto-marginal vein and medio-posterior oppo- 

 site at their origins. The apical vein runs into the costa before the tip, and 

 gives rise to a marginal branch at its basal and apical third. The post-api- 

 cal runs into the produced tip of the wing and gives origin to the discal ner- 

 vure. Hind wings, the costal is shortly forked near the tip. The subcostal 

 arises from the costal within the disk and is not produced toward the base. 

 The median is three-branched. Head without ocelli. Antenna? of the rj 1 densely 

 pubescent. Tongue as long as the thorax beneath. 



The structure of the posterior wings in the species described below forms 

 very nearly a parallel case to C. d i 1 u c i d a 1 i s described by M. Gueme. The 

 costal nervure ofdilucidalis is not, however, represented bifid, and the 

 branch which corresponds to the costal nervure does not arise within the cell 

 and give origin to the discal, but exterior to the disk and the discal nervure 

 arises behind it from the costal. They both concur in the absence of the dis- 

 cal, or independent nervule, and in the median being three-branched. May 

 not dilucidalisbean American species ? I cannot determine the question, 

 as M. Guenee's description is imperfect, from the fact that it was drawn from 

 badly preserved specimens. 



C. fulicalis . Fore wings white, fuscous at the costal portion of the base, 

 with a broad band near the base and a narrow wavy fuscous line crossing the 

 middle of the disk, sending from the median nervure a curved line to the in- 

 ner margin, convex exteriorly. The space between these lines is frequently 

 dusted with fuscous. From an elongated fuscous patch limited below by the 

 subcostal nervure, on the middle of the costa, departs an oblique ochreous 

 band, inclined to the inner angle and margined along the discal nervure on 

 both sides, with fuscous ; and from the posterior end of the costal patch, a 

 curved line joins the external dark margin of the band enclosing an oval spot 

 of the general hue. A subterminal band tapers to the inner angle, leaving on 

 each side of it two converging tapering bands of the general hue. Hinder 

 margin ochreous, margined internally with fuscous. Hind wings white, with 

 I860.] 14 



