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PROCEEDINGS OF THE NATIONAL MUSEUM 



though the endomera and penis are almost identical. The figure given 

 of the genitalia of annulatus may not be entirely accurate as to shape 

 of para meres, since they were not clearly visible in the only male 

 available for examination. The basal plate also differs in shape, that 

 of acuticeps being slightly narrower in anterior portion, while the 

 reverse is true of annulatus. Summarizing briefly the differences be- 

 tween acuticeps and annulatus^ we have a larger prothorax in the 

 former, a decided difference in shape of head in females, but not in 

 the males, and lastly the male genitalia. Q. acuticeps should probably 

 be reduced to a subspecies of annulatus. 



Table 2. — Measurements of Quadraceps annulatus and Q. acuticeps 



QUADRACEPS BURHINOIDES, new species 



Figure 45, e, f 



Types. — Male and female adults, from Biirhinus superciliains, col- 

 lected by the author at Paramonga, Peru, February 16, 1932; in 

 collection of author. 



Diagnosis. — This species is larger than either annulatus or acuticeps 

 and has the head of a somewhat different shape, as shown in the figure. 

 The male genitalia resemble closely those of acuticeps in general shape, 

 with the difference in size very small. In the female, abdominal ter- 

 gite V is deeply incised medially, while in acuticeps and annulatus it is 

 entire ; in the male there is a slight median incision on tergite III, with 

 I and II divided medially as in acuticeps. The genitalia differ from 

 those of acuticeps in minor details. The basal plate is narrower 

 basally, with sides incurved, while the lateral chitinous margins are 

 differently shaped ; the base of the parameres is rounded, not angulated 

 as in acuticeps., and their shape is somewhat different along inner edge. 

 The endomera also differ slightly in detail. 



