82 



ARCTIIDAE 



LITHOSIINAE 



Genus Illice Wlk. 



The species of this genus offer in the S genitalia excellent points 

 of differentiation which can in most cases be seen without removing 

 the abdomens as the sexual organs protrude ; we have made no slides 

 of these organs but an examination of the claspers under a lens is 

 sufficient to show that there are several distinct types, a study of which 

 clearly proves that our present arrangement is faulty. 



We have already (Contr. Ill, (3), 157) separated tcnuifascia 

 Harv. from miifascia G. & R., placing the former in the genus Oao- 

 dania Dyar which at least serves to call attention to the protruding 

 tuft of hair in the $ along the anal margin of the secondaries ; with 

 the types of both these species undiscoverable there is of course the 

 possibility of an error of determination on our part, but we have 

 made our determinations fit as closely as possible the rather inadequate 

 original descriptions and must leave the matter standing as it is for 

 the present. 



The clasper of uiiifascia is strongly bifurcate, showing a long 

 dorsal and a similar ventral prong; we have a series of a form from 

 the vicinity of Brownsville, Texas, which shows the same type of 

 clasper but differs in maculation in having the transverse band broken 

 into a small triangular costal spot and a similar larger one on inner 

 margin, the apices tending to meet in the center of the wing; an 

 ochreous streak along inner margin as in itnifascia; the ochreous por- 

 tions are rather paler than in uiiifascia and the pink of the secondaries 

 inclined toward flesh-color with generally a distinct dark costo-apical 

 spot ; the 9 's are rather smaller as a general rule and show a greater 

 tendency to have the band complete. As the form is quite readily 

 recognizable and in order to distinguish it from similar forms of tcnui- 

 fascia we propose for it the name of ruptifascia (PI. XIV, Fig. 5), 

 considering it for the present as a race of unifascia (Fig. 4) ; our 

 types are 8 S and 5 9 from Brownsville and San Benito, Texas, 

 captured on various dates from March to June, probably indicating 

 several generations. 



