68 Fleas of Eastern United States 



Male. Preantennal region of the head armed with two rows 

 of bristles; the upper row consisting of about six bristles, the 

 lower row consisting of three long and stout ones. Genal proc- 

 ess acutely pointed posteriorly. First antennal joint with about 

 ten small setae; second antennal joint with about five bristles, 

 some of which may exceed the third joint in length. A series of 

 about a dozen irregularly arranged bristles along the posterior 

 margin of the antennal groove. Postantennal region armed with 

 a marginal row of about six bristles; anterior to this is another 

 row of about six bristles which are sometimes irregularly ar- 

 ranged; above this row there is usually a single bristle close to 

 the antennal groove. Pronotum armed with two rows of bristles. 

 Meso- and metanotum each armed with three or four rows of 

 bristles, the bristles of the posterior row being long and robust, 

 the other small and weak. Each abdominal tergite with two or 

 three rows of bristles; the anterior tergites further armed with 

 one to three stout dorsal teeth on a side. Modified segments: 

 Process of the clasper much longer than in other species of the 

 genus, tapering gradually to a blunt termination where it is 

 armed with two small bristles. Movable finger with two short 

 spiniforms at the apex and a longer, more robust one at the 

 outer angle. Manubrium short and broad, not ending in a point. 

 Penis long and slender, ending in a curved process; spring not 

 long, completing* one or two large circles about the distal third 

 of the penis. Sternite VIII expanded apically and armed with 

 a number of slender curved setae and two large bristles. For 

 further details concerning the structure of the male genitalia. 

 see Plate XVII, fig. 85. 



Female. Chaetotaxy of the head essentially as in the male 

 (Plate XVII, figs. 88, 89) . Sternite VII divided by a broad sinus 

 into two lobes, of which the upper is rounded and extends 

 further distad than the pointed lower lobe. Head of recepta- 

 culum seminis oval, less than twice as long as wide. For further 

 details concerning the structure of the female genitalia, see 

 Plate XVII, fig. 86. 



Records. MASSACHUSETTS— Edgartown, October 2, 1937, 

 on Microtus pennsylvanicus pennsylvanicus (Ord) , two males: 

 Chilmark, on same host, September 2, 1937, male and female 

 (C. N. Smith) . 



Eastern hosts. Meadow-mouse (Microtus pennsylvanicus 

 pennsylvanicus (Ord) , Screech Owl ("Megascops asio") . 



Eastern localities. Iowa, Massachusetts, New York. 



Type material. Female holotype from Wellesley, Massachu- 



