J. H. MERRILL 121 



segment. At the tip of the fifth is a pair of strong, well-developed, 

 incurved claws, between which is a large pulvillus. 



The middle coxa is larger than the fore coxa and is more cylin- 

 drical than conical. The middle femur is straighter and longer 

 than the foi'e femur. At its base it is narrow, but soon broadens 

 out and remains the same width for the rest of its length. The 

 middle tibia is longer than the fore tibia and also longer than 

 the middle femur. In all other respects the middle leg is like 

 the fore leg. 



The hind legs are the longest and in all respects they resemble 

 the middle legs rather than the fore legs. 



.4 bdomen 



The abdomen consists of nine visible segments. It is depressed 

 behind the propodeum but towards the end is mostly compressed. 

 It has lateral impressed lines on segments three to six, which 

 converge toward the middle of the base. The abdomen is some- 

 times finely, transversely- aciculated. The dorsal portion is 

 coriaceous. 



The first segment of the abdomen is the median segment or 

 propodeum, and has often been considered to be part of the 

 metathorax. Anteriorly it articulates with the metapostscu- 

 tellum and the metaepimeron. The latter extends along its 

 lower border. The sternum of this segment is either lost or 

 has fused with the metasternum. The pleural elements have 

 fused with the notum forming a single continuous plate. It is 

 usually smooth, but in some cases has a channeled groove along 

 its mid-dorsal line and may even be areolated. The presence 

 or absence of these areolations is used for generic distinction. 

 On either side it bears a large spiracle, these forming the largest 

 spiracles found in the abdomen. 



The actual second segment, usually rated as the first by sys- 

 tematists, is constricted at its base, joining the true first segment 

 or propodeum as by a stem. Its attachment is such that it is 

 enabled to articulate freely. Here as in all the rest of the seg- 

 ments, the pleura are fused with the notum. It is straight, with 

 its spiracles placed before the middle and closer to each other 

 than to the apical margin. These facts are made use of in 

 classifying to the tribe. At the base of this segment, the fused 



TRANS. AM. ENT. SOC, XLI. 



