the Lepidopterous Family Cossidae. 



165 



Fig. 19, 



-Lentagena Iristani, 

 Schaus. 



small. The connection between \b and lc of fore-wings 

 is not developed, the latter vein becoming obsolete before 

 it reaches the point of connection in Givira. 



Lentagena is remarkable for its minute areole, which if 

 not carefully looked for might 

 be thought to have been com- 

 pletely lost.* It well illustrates 

 the process by which the areole 

 becomes obliterated by coal- 

 escence of its upper and lower 

 enclosing vein-trunks. In the 

 fore-wings there is an oval 

 median cell of some size, but 

 in the hind-wing there is none, 

 and the unbranched median 

 vein has been displaced towards 

 the dorsal margin of the cell. 

 At first sight it looks as though 



the upper branch of the median had become obsolete, but 

 comparing it with Ingurimorpha, in which the termination 

 of the median above vein 5 shows that the upper branch 

 is represented, it seems to me at 

 least equally probable that the 

 median has become displaced 

 dorsally after coalescence of its 

 branches. In this genus the $ 

 antennae are dentate or shortly 

 bipectinate to apex, the palpi are 

 rather small, and there appear to 

 be no tibial spurs. 



I have not seen any example 

 of Trigena, Dyar, in which there 

 is stated to be no areole, but 

 there is certainly none in the 

 species tigrata, Schaus, which I am 

 unable to refer to any described 

 genus.f In this the neuration of the hind-wing is that 

 of Lentagena, excepting for the presence of a connecting 



* .Mr. Dyar. Proc. U.S. Nat, Mus., xxix, p. ITS (1906), describes 

 Lentagena as having no areole. This may, fur all I know, be the 

 case sometimes, 1ml 1 have examined one example each (all that 

 are accessible to me) of tristani, albicosta, and nudaridia, and found 

 it present in all of them, thoughin the last, which i.s the type species, 

 certainly very minute. 



f 1 propose for it the name Acytlara, gen. no v. 



Fig. 20. — Acyttara igraUt, 

 Schaus. 



