118 ZYG.ENID.E AND BOMBYCID^ 



B0MBYCID5;. 

 ARCTIINjE. 

 Genus LEPTARCTIA. (N. G.) 



Head prominent ; vertex fiat, clothed with long hairs directed for- 

 ward between the antennae, which are moderately long, closely bipec- 

 tinate in 5 , subsimple in ? . Front broad hairy. Palpi long, slen- 

 der, projecting beyond the front nearly half their length, basal joint 

 clothed with long fringy hairs. Body parts smooth. Patagia small. 

 Abdomen slender in $ , terminating in a small anal tuft. 



Anterior wings twice as long as broad. Costa straight; apex slightly 

 rounded; outer margin oblique, slightly convex; inner angle distinct; 

 inner margin straight, very convex at the base. Costal vein reaching 

 the costa beyond the middle ; subcostal 5-branched. 1st subcostal 

 short, going rapidly to the costa ; 2d rises a little beyond the discal 

 vein, very short ; 3d rises just beyond 2d and forks midway of its 

 length, both branches going to the costa ; 4th contiguous at its base to 

 the 3d and goes to the outer margin ; 5th rises on a short stalk at the 

 discal vein, which is nearly obsolete. Median vein 4-branched. ist 

 and 2d nervules with common origin, 3d slightly removed from 2d, 

 4th distant. 



Secondaries triangular. Costa slightly convex; outer angle rounded; 

 outer margin nearly straight ; anal angle rounded ; inner margin 

 straight and very long. Costal vein long, united at base to the sub- 

 costal. Subcostal vein bifurcate at the discal vein. 3d median ner- 

 vule as far from the 2d as 2d from ist. Submedian vein distant long. 

 Internal vein long. 



In the shape of the wings as well as in their coloration, this genus 

 shows great variation in what are undoubtedly the same species, and 

 appears to be extremely susceptible to local influences. Although I 

 suspect that Platardia modesia, Packard, belongs to this genus, and is 

 not properly located, the following insects cannot be referred to Pla- 

 larciia, which Mr. Packard describes as having the anterior wings pro- 

 portionally broad, and the outer margin of the secondaries parallel 

 with the costa. The present genus differs from Nemeophila in having 

 longer palpi ; the head and prothorax are more prominent ; the head 

 of Nemeophila is smooth and not crested in front, while the thorax 

 and patagia are more hairy in the latter genus. In Nemeophila two 



