168 Proceedings of the Biological Society of Washington. 



and several on sides. Color. — First and second antennal segments whit- 

 ish or tinged with brown, distal third of third segment light, remainder of 

 third and all of fourth segment brown. Head light except that portion 

 lateral to the posterior pair of spines which is dark brown. Prothorax 

 whitish except for posterior half of dorsal surface which is brownish, this 

 dark area is bisected by a broad, median, light stripe. Two central dark 

 areas on mesothorax on either side of a narrow, median light line broaden- 

 ing at its posterior end. Posterior edges of mesothoracic wing pads dark, 

 remainder white. Median, dorsal, portion of abdominal segments three to 

 nine, varying from light to dark brown (seventh segment sometimes white), 

 remainder whitish. Spines on head dark. Pair dark spines arising from 

 median light stripe on prothorax. Prominent spines on posterior lateral 

 edges of prothoracic expansions dark, other pro thoracic spines light. All 

 large spines on mesothorax and mesothoracic wing pads dark, others light. 

 Median dorsal spines on fifth, sixth, eighth and lateral spines on ninth ab- 

 dominal segments light brown to dark brown, remaining abdominal spines 

 whitish. Ventral surface whitish, except base and tip of rostrum and articu- 

 lation of femur and tibia and tip of tarsus which are brownish. 



