30 



In Eupitkecia tniserulata, the terminal segment is large, square, and mem- 

 branous, much as in Lygris divcrsilineala; bul the large spatulate claspers 

 end on the upper edge in a ] < > i 1 lt , recurved, partly chitinous hook, meeting with 

 its fellow over the spine of the supra-anal plate. This last is membranous, 

 the edge solid, with a median solid portion from which the spine arises. 

 There is also a large sharp infra-anal mucronate chitinous plate. 



In Eupitkecia absyntkiata, (lie end of the abdomen is covered with a 

 conical membrane covered with scales, in which I could perceive no suture; 

 after removing the scales with a hair pencil, I was obliged to rupture the 

 membrane before laying open the geuital armature. The latter then appeared 

 covered with scales. From this it would appear that immediately previous to 

 copulation this membrane is ruptured and possibly east oil". The lateral 

 claspers are very large, long, pointed triangularly. The supra-anal plate is 

 short and broad, entirely dill'erent from that of E. miserulata; the recurved 

 spine is membranous, forked, and apparently immature The moth was very 

 fresh, and evidently was not sexually mature. 



In one E. subapicata which had not copulated, the terminal segment of 

 the abdomen is conical, with no suture above or beneath, but perforated at 

 the end, out of which projected the extreme tips of the lateral claspers This 

 membranous covering is evidently preputial in its function. The claspers 

 arc entirely different from those of the two other species, being widely and 

 unequally forked. The supra-anal plate is much as in E. miserulata, but 

 less membranous. The recurved spine is large and solid, with a broad 

 truncate tip. 



In an individual of Hydriomena Irifasciata, in which the parts of the 

 armature were separated, and the insect had evidently used them, they arc 

 much as in Lygris truncata; the lateral claspers arc, however, much broader 

 at bas:>, subtriangular at tip; the supra-anal plate is remarkably short, with a 

 median suture, and terminating in a square expansion, from which arise two 

 long spines, blunt, not much curved. Thus, here wc have a new character 

 added to separate this genus from Petropkora or Glaucopteryx ; i. r., the forked 

 supra-anal spine. In Eupitkecia only have I seen it separated, and then in an 

 immature individual. 



Not having farther time to spend on this subject at present, I will leave the 

 matter so far as relates to the Larentince, and go to another group, merely 

 remarking in passing that, after a study of (lie genital armature, it seems an 



