312 APPENDIX. 



transverse one on each cheek above ; thorax confluently 

 punctured, margined, and with three longitudinal impress- 

 ed lines distant before ; ivings fuliginous; abdomen bright 

 rufous; first segment above blackish ^feet piceous-black. 



Length more than half an inch. 



The abdominal colour of this species distinguishes it at 

 once from any other. In dromedarius the middle seg- 

 ments of the tergum are rufous, but the terminal and three 

 basal segments, are black, and there is a series of whitish 

 lateral spots. 



2. X. tibialis. Black ; four lateral spots of the abdomen, 

 first tarsal joint and base of the tibia white. 



Inhabits Pennsylvania. 



Stethidium rough with confluent punctures, immacu- 

 late ; wings hyaline, nervures dark fuscous ; feet black ; 

 tibia white, fuscous at tip ; tarsi, first joint white ; abdomen 

 black, three middle segments and penultimate segment, 

 each with a white spot on each side. 



Length more than two-fifths of an inch. 



This species resembles the cam,elus, Fabr. and Uro- 

 CERUs annulatus, Jur., but is less than half the size of 

 either, and the former, according to authors, has ferrugi- 

 nous feet and a smooth thorax ; the latter has a lateral 

 white spot on each of the abdominal segments excepting 

 the penultimate one. 



TARPA, Fabr. Le Peletier. 



T. scrijjta. Black, with white lines and spots ; abdomen 

 rufous. 



Inhabits North-west Territory and Arkansa. 



HypostoTna on its anterior margin, m^andibles ^nA palpi, 

 whitish ; line upon the orbits extending from near the an- 



