1910] North American Pauiscini 191 



thoracic pleuron, and the metathoracic epimeron, while the base 

 of the triangle lies dorsally below the furrow of the post scutel- 

 lum. 



The metathoracic epimeron is a large plate bordered on its 

 dorsal side by the median segment, anteriorly by the meta- 

 thoracic episternum above, and the mesothoracic pleuron below, 

 while posteriorly it bears the coxa of the hind leg. 



The median segment is a large arched plate distinctly 

 striate above covering the area between the post scutellum, in 

 front, and the petiole behind, and extending transversely from 

 the metathoracic pleuron of one side to that of the other. A 

 short distance behind the angle where the median segment, 

 epimeron and episternum of the metathorax meet is an oval 

 stigma on each side. Near the hinder margin of the plate, on 

 each side, is a crescentic elevation, immediately behind which is 

 a depression of the surface. Extending forward from this cres- 

 cent to a point near which the median segment meets, the pos- 

 terior dorsal angle of the metathoracic episternum is an elevated 

 area, just below which is situated the dorsal edge of the stigma. 

 This elevated area may be used for convenience as indicating the 

 division between the dorsum and the sides of the median seg- 

 ment, though there is no evidence of a separation of these 

 portions into separate plates. 



At the extreme posterior end of the median segment there 

 is a semi-circular carina which is quite prominent. The median 

 segment is marked by fine, distinct, transverse striations and 

 the metathorax, as a whole, is pubescent, and very finely 

 punctured. 



ABDOMEN. 



This portion of the body has more or less of a russet brown 

 color varying from a light yellowish brown, in some specimens, 

 to a reddish brown, in others. The abdomen is composed of 

 eight segments in both male and female, and is compressed 

 laterally, more so ventrally than dorsally. The segments, as a 

 general thing, decrease somewhat in length after the second one 

 which is only about half as long as the first, but rapidly increas- 

 ing in height up to the sixth inclusive, but the seventh and eighth 

 are smaller. 



The median segment has been included with the description 

 of the metathorax. While it is undoubtedly the first segment of 

 the abdomen, for convenience of description, we may consider 



