Family Dolichopsyllidae Baker 43 



on a side. Males with one long antepygidial bristle and one or 

 two minute ones; females with two antepygidial bristles of 

 which the lower is the shorter. Other structural details essen- 

 tially as in Ceratophyllus Curtis. 



This genus is represented in the East by a single species 

 which occurs rather commonly on ground squirrels. 



Opisocrostis bruneri (Baker) 



(Plate XI, figs. 50, 51, 53) 



1895 Pulex bruneri Baker, Can. Ent, 27: 131. 



1896 Pulex bruneri Osborn, United States Dept. Agric. Div. Ent., Bull. V 

 (n.s.), p. 149, fig. 82. 



1898 Pulex bruneri Baker, Jour. New York Ent. Soc, 6: 55. 



1904 Ceratophyllus bruneri Baker, Proc. United States Nat. Mus., 27:413, 

 PI. XXV, figs. 1-5. 



1905 Ceratophyllus bruneri Baker, Proc. United States Nat. Mus., 29:135. 

 1914 Ceratophyllus bruneri C. Fox, United States Public Health Ser. Hyg. 



Lab., Bull. 97, Pi X, fig. 9; PI. XVII, fig. 35. 

 1930 Oropsylla bruneri Wagner, Konowia, 8:313. 

 1933 Opisocrostis bruneri Jordan, Nov. Zool., 39:73. 



Male. Preantennal region of the head with two rows of 

 bristles; lower row with three robust bristles, upper row with 

 one to three much more slender ones. Posterior margin of the 

 antennal groove with a series of small setae. Postantennal 

 region armed with a marginal row of four or five bristles and 

 one or two stout bristles near the second and third antennal 

 segments (Plate XI, fig. 50). Pronotum with a single row of 

 alternating stout and weak bristles. Mesonotum armed with 

 two or three rows of bristles; metanotum armed with about 

 five rows. Each abdominal tergite with two rows of bristles. 

 Metanotum and the anterior three or four abdominal tergites 

 each armed with one or two short stout dorsal teeth on a side. 

 Modified segments: Process of the clasper more or less 

 rounded, not prominent, moundlike, with three slender bristles 

 apically and two stouter ones at the side. Movable finger large 

 and heavy, anterior margin concave, posterior margin with one 

 long bristle and five or six shorter ones distally. Manubrium 

 curved, finger-like, blunt distally. Penis broad, ending in a very 

 short process; spring long but barely completing a single turn. 

 For further details concerning the structure of the male geni- 

 talia, see Plate XI, fig. 51. 



Female. Chaetotaxy of the head and general structure es- 

 sentially as in the male. Head of the receptaculum seminis 

 more or less rounded, much wider than the long tail. For 



