Lepidopterological Contributions, 375 



internal margin short and straight, a little more than half as long 

 as the costal edge. Posterior wings, reduced, roundedly sub-qua- 

 drate ; anal angle bluntly exserted. All the nervules long and 

 straight, or but slightly curved. The m. nervure of the primaries 

 throws out four m. nervules ; of these the second and third are 

 thrown off together from one point before the discal cross vein 

 which closes the cell; the fourth well removed from the third; a 

 sub-median fold. The costal nervure of the secondaries is basally 

 arched. 



The position of this genus is intermediate between Oeceticits, 

 Guilding, and Lacosoma, Grote. It possesses close structural 

 affinities with Lacosoma, resembling this genus also in colora- 

 tion and in the style of squamation. The analogies of Psy- 

 chocampa are with the Ceratocampidae, and, when we compare 

 the genus with Anisota, Ilubner, (Dryocampa, Harris), these 

 become quite striking, so that at first sight we should be 

 inclined to refer it in the immediate vicinity of Hiibner's genus, 

 before weighing the characters and separating those which are 

 of analogy from those which are of affinity. It is evident, that 

 those that are more clearly superficial, are those that would 

 decide the position of Psychocampa among the Ceratocampidae. 

 And, indeed, those characters which would influence this latter 

 reference, i. e. the shape of the wings and the close squama- 

 tion, are shared in a hardly different, but somewhat less 

 exaggerated degree, by certain other Psychid genera heretofore 

 alluded to. It is the exaggeration of these correspondencies 

 that renders Psychocampa interesting as an intermimetic form. 



Psychocampa concolor, n. s. 



(Plate 14, fig. 5, $ .) 



Entirely dull olivaceous brown, with a slight cupreous reflection. 

 There are faint traces on the primaries of a blackish inner line and 

 median discoloration, and of a common outer line crossing both 

 pair on the upper surface, and which is roundedly angulated on 



