the short, alnost tailless, female- type spirac\alar plate of the 

 male H. schulzei that is usually surrounded by numerous hairs. 

 This type of spiracular plate is found in the male of no other 

 species in the genus. ^An approach to this spiracular form 

 occurs in "H. scupense " ; see page /U-S^ In other characters, 

 these two species are similar. 



Females of these two species are also superficially similar 

 but the genital apron of H^ schulzei is considerably different 

 and the scutum (of available specimens) is slightly more elongate 

 than that of H. droraedarii. The genital apron is subrectangular 

 with slightly"~convex anterior and posterior margins and rovinded 

 junctxrres; this convexity is increased with extreme engorgement. 

 In profile, the apron is flat when unengorged but after feeding 

 it protrudes and is markedly depressed posteriorly. The female 

 is illustrated herein in the APPHTOIX (PLATE XIXC) inasmuch as 

 distinguishing features were recognized only near the termination 

 of the present study after other illustrations had been numbered. 

 Delpy and Adler and Feldman-l'tuhsam did not describe the female 

 genital apron of the meagre aiODunt of material available to them. 

 The short, wide scutal outline with a bluntly rounded posterior 

 margin, as illustrated, is similar in all available specimens 

 and corresponds to that delineated by Pomerantzev (1950). Other 

 workers however, have shovm it as more elongate and with the 

 posterior margin gradually converging to a fairly narrow point. 



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