Family Dolichopsyllidae Baker 57 



Fifth tarsal segment of each leg armed with four pairs of 

 lateral plantar bristles, a basal and an apical submedian pair. 

 Movable finger of the male with two or three heavily pigmented 

 spiniforms. 



This genus is represented in the East by a single species 

 which seems to parasitize the flying squirrel in particular. 



Opisodasys pseudarctomys (Baker) 



(Plate XIV, figs. 68, 69, 72) 



1904 Ceratophyllus pseudarctomys Baker, Proc. United States Nat. Mus., 

 27:399, PI. XXIV, figs. 1-7. 



1905 Ceratophyllus pseudarctomys Baker, Proc. United States Nat. Mus., 

 29:133. 



1905 Ceratophyllus acasti Rothschild, Nov. Zool., 12: 168, PI. 7, figs. 19, 20. 



1928 Ceratophyllus pseudarctomys Stewart, Cornell Univ. Agric. Exp. Sta., 

 Mem. 101, p. 869. 



1929 Ceratophyllus pseudarctomys Jordan, Nov Zool., 35: 28, 176. 



1933 Ceratophyllus pseudarctomys Stewart, Jour. New York Ent. Soc, 



41:258. 

 1933 Opisodasys pseudarctomys Jordan, Nov. Zool., 39: 72. 



Male. Preantennal region of the head armed with an ocular 

 row of three long bristles; above this row near the antennal 

 groove are two or three weak bristles. Anterior and posterior 

 margins of the antennal groove armed with numerous small 

 setae. Posterior margin of the head with a row of about six 

 stout bristles; above the most ventral bristle of this row is a 

 single small bristle (Plate XIV, fig. 68) . Pronotum with a 

 single row of bristles and a ctenidium of about twelve spines 

 on a side. Meso- and metanotum each armed with three rows of 

 bristles anterior to which there may be a number of irregularly 

 scattered ones. Each abdominal tergite armed with two rows of 

 bristles. Anterior abdominal tergites further armed with two 

 or three stout teeth on a side. Three antepygidial bristles pres- 

 ent on a side, the outer two well developed, the middle aborted. 

 Modified segments: Movable finger long and curiously formed, 

 the upper and lower angles produced posteriorly; the upper 

 angle with a long curved spiniform, the lower angle with two 

 much smaller ones. Acetabular bristles situated on an elongate 

 process. Process of the clasper long and finger-like. Manu- 

 brium long and broad, reaching almost to the termination of the 

 penis, and ending bluntly. Penis broad, tapering to a point; 

 spring unusually short, not completing a turn. For further 

 details concerning the structure of the male genitalia, see Plate 

 XIV, fig. 72. 



