Oct., 1914 Bulletin of the Brooklyn Entomological Society 81 



beneath. First joint of antennae subequal to length of head, 

 armed with a few small spines. Thorax longer than broad at 

 base, much narrowed anteriorly, spinose at the edges. Anterior 

 femora armed with short spines above and beneath ; posterior 

 simple ; intermediate and posterior tibiae simple. Abdominal seg- 

 ments one to six ampliated near basal angle into foliaceous spined 

 lobes ; spined on the connexival edge. 



This genus is somewhat obscure but it is Stenopodine in its 

 general facies and characters, and comes near Seridentns Osborne, 

 from which the foliaceous lobes at the basal angle of the ab- 

 dominal segments and the other characters given abundantly 

 separate it. 



Type: Achillas bicaudatus Bueno. 



Distribution : British Guiana. 



Achillas bicaudatus sp. nov. 



Head one-fifth longer than broad including the eyeS; which are 

 globose and prominent, situated nearer the base than the front. 

 Ocelli nearer to the eyes than to each other, not prominent. 

 Front with two short spines directed anteriorly ; head beneath 

 with three pairs of short simple setose spines, of which the 

 postocular pair is the longest, and that under the eyes the shortest. 

 The upper surface of the head is thickly set with an abundance of 

 short spines. Antennze: first joint stoutest, shorter than sec- 

 ond, set with short setigerous spines; second joint longest, sub- 

 equal to first joint and head taken together; third joint shortest, 

 fourth about one half longer; third and fourth joints taken to- 

 gether a little more than half as long as second, and shorter than 

 first. Prothorax narrowing anteriorly, over four times as long as 

 wide anteriorly and nearly four times as wide at the base as anteri- 

 orly, slightly sinuately, constricted about the middle and covered 

 with short spines, a few of those along the margins longer than 

 the others ; base rounded. 



Scutellum nearly parallel sinuately sided, abruptly coming to a 

 blunt semi-erect point, slightly tumid. Wings slightly narrower 

 than abdomen, leaving the foliaceous lobes exposed. Abdomen 

 four and a third times as long, including the lobes, as broad, nar- 

 rowing posteriorly, the sixth segment branching into two broad 

 flaring mucronate lobes. At the basal angle of each abdominal 



