62 Journal New York Entomological Society, t"^ o^- xxv. 



Coremata of the type that occur in the Xanthorhoe group are ab- 

 sent, but there are usually small ones nearer the tip of the abdomen. 



37. There remains a considerable mass of species with what may 

 be called the typical Hydriomenid structure, without strong secondary 

 sexual characters except in the male antenns. Below I have grouped 

 our species, so far as I have seen them, as well as a few of the Euro- 

 peans, on what characters I could find. Those from the antennae 

 are generally clean-cut but often separate very closely related species, 

 and the same is true of the single or double accessory cell. The 

 genitalic characters are striking and seem to form natural groups, but 

 I have seen only the eastern species as a rule. The long and bent, or 

 short and straight middle discocellular of the hind wing is widely use- 

 ful, but in ccFsiata and aurata it separates closely related species; in 

 fact our aurata appears in the list as cccsiata, which seems really con- 

 fined to the old world. Coremata or membranous eversible organs 

 near the end of the abdomen are general in the group with short 

 middle discocellular, but are rudimentary in silaceata, which is also 

 aberrant in markings, and belongs to a mainly Indian group whose 

 genitalia have not been examined. 



Of the genera which would run out here the following are the 

 most definable : 



Heterusia, of South America, has simple markings above and com- 

 plex below as in Stamnodes, in part of the species the front is smooth 

 and the structure becomes like Stamnodes. 



Eurhinosea: fore wing broad, subfalcate, one ace. cell. Male an- 

 tennae strongly serrate and fasciculate; pale yellow (flavaria only). 



Ortholitha: Male antennae pectinate or rarely subpectinate, mdcv. 

 straight, short; moth brown with characteristic markings similar to 

 Monotaxis, which it also resembles in having the costa of the hind 

 wing much longer than the inner edge of the fore wing (Palsearctic). 



Oligopleura: fore wing produced at apex and sometimes at R,, in 

 that case truncate at tip, also at M3 and concave between, hind wing 

 with M3 and Cu^ stalked, or in macrocephala united (South America). 



Anchiphyllia: Hind wing strongly falcate on M^, male abdomen 

 with side-tufts, otherwise like Ersephila, markings of Monotaxis (S. 

 America). 



Priapodes : Second joint of palpus very long and cylindrical, closely 

 scaled, third joint short; fore legs very long, folded on sides of neck 



