( clii ) 



complex organs of the lower orders where the anus in the 

 tergite has its own armature and the sedoeagus in the sternite 

 has its own armature, though of course both must be correlated 

 with each other.) The separation of the sternite and tergite 

 sections being articulated generally only at the rear is perhaps 

 the most evident atavic character. 



LasiocamjM quercHs, L. 



The cingula in the tergite is a broad collar, quite simple, 

 through which passes the anus ; the sternite section is angled 

 backwards and is developed into two powerful lateral tusk- 

 like sclerites, evidently movable vertically and to some extent 

 laterally ; these apparently are more or less aids to the harpa- 

 gones, which are placed more medially and are broadish lateral 

 plates rounded on the upper costa, but cuneate in front ; the 

 sedoeagal trough is composed of a deeply hollowed sclerite, with 

 largish lateral plates (open above), each having a broad digitate 

 frontal process ; in this hollowed area the sedoeagus rests, it is 

 a fair-sized straightish tube to a third from the tip, where it is 

 suddenly excised, the upper portion of the tube being as it 

 were cut off, though the tip itself is tubular and terminates in a 

 point ; the vesica is emitted through the excised portion, and is 

 armed with a certain number of teeth, behind which it is 

 finely shagreened. ' 



Macrothylacia ruhi, L., 



has the cingula sectioned as in Lasiocampa, the tergite part 

 being very ample indeed, narrowly bridged as in the previous 

 genus at the rear, and produced forwards at the upper fore 

 apex into curved prominent teeth ; the tegumen is absent ; 

 the harpagones, medially placed, consist of two long arms, 

 below which are two largish lobes whose lower margins are 

 produced into longish apical digitate processes ; the sedoeagus 

 is very similar to that of querctls, but narrower. 



Epicnaptera ilicifolia, L., 



has the cingula composed of two almost quadrangular 

 plates at the base of the sternite, with a smallish saccus ; the 

 tergite section is a narrow collar with a long narrow tegumen 

 tapering to a point and hollowed out below ; the harpagones 



