NYMPITALID.R 5 



the tibiae are obsolete ; tlie spines and sometimes tlie spurs of the tarsi are also 

 absent ; in some males the tarsi are not even divided into joints and tliej are always 

 unarmed. Anal segment of the male entire above, the upper organ generally stout, 

 with or without lateral arms, and provided with an elongate, tapering, pointed 

 median hook, or if bifurcate only minutely excised at tip ; clasps forming lateral, 

 lamellate, more or less convex plates very variable in shape, proportion, and armature. 

 Forewings with the costal vein terminating near the middle of the costal border ; 

 subcostal vei]i five branched, at least one of which is emitted before the end of the 

 cell ; the discoidal cell may be either closed or partially open ; median vein three 

 branched ; internal vein, when present, very short and running into the submedian 

 vein. Hindwiiigs with the costal vein terminating between the middle and the tip of 

 the costal border, emitting from near the base an upward-directed bifid branch 

 (=precostal) ; subcostal vein three branched; discoidal cell either open or closed; 

 median vein three branched ; submedian vein usually terminating at the anal angle, 

 sometimes on the outer border ; internal vein usually terminating on the inner border, 

 sometimes at the anal angle. Inner margin expanded, embracing the abdomen 

 beneath. 



Egg. — Globular or dome shaped, the surface marked either with polygonal cells 

 (whose walls may be either slight or prominent), or else furnished with a number of 

 raised longitudinal ribs, usually extending over the whole egg, but sometimes 

 confined to the upper half and with much more delicate cross ridges. 



Cateepillak at Birth. — Head generally larger, never smaller, than the thoracic 

 segments, and usually roughened, always with a greater or smaller number of hair- 

 emitting papillse ; never encroached npon by the integument of the first thoracic 

 segment. Body cylindrical, often tapering from the front backward, but rarely if 

 ever from the middle forward, furnished with longitudinally ranged cuticular appen- 

 dages of various shapes, generally longer than the segments and often more or less 

 clubbed, some of the series shifted in position in passing from the thoracic to the 

 abdominal segments ; first thoracic segment with no distinct corneous dorsal 

 shield. 



Adolt Caterpillar. — Head free, furnished to a greater or less extent with hairs 

 and sometimes with spinous processes. Body nearly or quite cylindrical, long and 

 slender, equal or tapering toward either or both ends ; or, single segments may be 

 swollen wholly or in part, and then the caterpillar becomes distinctly moniliform; 

 simply furnished with short hairs or bristles arising from minute papilla, or else 

 supplied with unequally or regularly distributed spines or fleshy tubercles ; 

 spiracle of the eighth abdominal segment on a line with the others. 



Chrysalis. — Either suspended by the posterior extremity only, head downward. 



