80 Bulletin of the Brooklyn Entomological Society Vol. IX 



Ty^e : Riituba perpugnax Bueno. 

 Distribution : British Guiana. 



Rutuba perpugnax sp. nov. 



Head including genal spine twice as long as broad at the eyes 

 which are globose and set midway of the head. Ocelli nearly con- 

 tiguous to the eyes and centrally behind them. Antenniferous 

 tubercles with a sharp semi-erect spine pointing forward. Anten- 

 nas setose beneath ; third joint shortest, one-third as long as fourth ; 

 second joint longest, longer than the head, but shorter than the 

 head and first joint taken together. First joint longer than the 

 head, with a long apical spine. Prothorax narrowing anteriorly, 

 three times as long as wide anteriorly, less than one-third longer 

 than wide at base, armed with a small blunt spine slightly above 

 basal angle, and another longer about one-third from the base ; 

 base slightly sinuate. Scutellum longer than wide at base, tumid, 

 sides slightly rounded. Wings as wide as abdomen, semi-mem- 

 branous throughout, leaving two-thirds of the last abdominal seg- 

 ment exposed ; membrane with three simple longitudinal nervures. 

 Abdomen five times as long, including the spines, as broad, sub- 

 parallel, basal angle of abdominal segments one to four produced 

 into a small black spine ; fifth segment into a long pointed outwardly 

 diverging spine ; sixth segment produced into two long acute spines, 

 two-thirds as long as the body of the segment, first to fourth seg- 

 ments keeled. Middle pair of legs shortest, femora and tibiae 

 simple in second and third pair. First pair spined, as in generic 

 description. 



Dimensions : Head, long. 4 mm. with genal spines ; lat. 2 mm. 

 with eyes. Prothorax, long. 4.5 mm., lat. at base 3.5 mm.; an- 

 terior margin, 1.5 mm. Scutellum, long. 1.5 mm.; lat. 1.25 mm. 

 Abdomen, long. 17 mm.; lat. 3.5 mm. Total length, 2.5 mm., 

 greatest width, 3.5 mm. 



Described from one ^ from Tumatumari, Rio Potaro, British 

 Guiana, taken in April by J. M. Geddes. 



Achillas* gen. nov. 



Head little more than half as long as thorax, anteocular part 

 shorter than postocular, which is furnished with setigerous spines 



* The murderer of Pompey. 



