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PROCEEDINGS OF THE NATIONAL MUSEUM 



ending in a clear circle, which increases in size posteriorly. In the 

 male sternites IV to VII seem to be fused into a solid plate, as shown 

 in the figure, but in the female they are separated by narrow hyaline 

 bands, except VII and VIII, where the genital plate covers all of 

 VII and anterior half of VIII. The chaetotaxy of the genital plate 

 is similar in the four species I have seen, differing only in size, length, 

 and number of spines, but the shape of the plate itself differs, as 

 may be seen from the figures. 



The type series of the species consists of four males and two females, 

 with one male and three females from other individuals of the same 

 host. 



Figure 44. — Acidoproctus 



a-c, Acidoproctus rostratus (Rudow): a. Front of head of male; b, male genitalia; c, genital 



plate of female. 

 d-g, A. hopkinsi, new species: d, Male; e, front of head of male;/, male genitalia; g, genital 



plate of female. 



