Family Dolichopsyllidae Baker 69 



setts, on "Megascops asio" in the United States National 

 Museum. 



Megabothris acerbus (Jordan) 



(Plate XVIII, figs. 91, 92, 93) 



1925 Ceralophyllus acerbus Jordan, Nov. Zool., 32: 111, fig. 43. 



1929 Ceratophyllus acerbus Jordan, Nov. Zool., 35: 170, fig. 5. 



1933 Ceratophyllus acerbus Stewart, Jour. New York Ent. Soc, 41: 255. 



1933 Megabothris acerbus Jordan, Nov. Zool., 39:77. 



1937 Megabothris acerbus Jordan, Nov. Zool., 40:284. 



Male. Preantennal region of the head armed with two rows 

 of bristles; the upper row consisting of about five, the lower row 

 consisting of three much longer and more robust ones. Posterior 

 margin of the antennal groove with about a dozen weak bristles. 

 Postantennal region with a marginal row of about five bristles, 

 anterior to which are three bristles of which one is much stouter 

 than the others. Pronotum armed with a single row of alter- 

 nating strong and weak bristles. Mesonotum armed with a 

 marginal row of long bristles, anterior to which are three rows 

 of much weaker ones. Metanotum and each abdominal tergite 

 with a marginal row of long bristles, anterior to which are one 

 or two rows of weaker ones. Metanotum and first four abdo- 

 minal tergites further armed with one or two teeth on a side. 

 Modified segments: Process of the clasper broad and short, 

 truncate, its apex with three weak bristles. Movable finger 

 about three times as long as broad with the anterior margin 

 produced into an angle at about the middle. Apex rounded, 

 with four or five weak bristles and two small heavily pigmented 

 spiniforms. Posterior margin armed with a long bristle. Penis 

 bladelike, acutely pointed; spring long, but not completing a 

 turn in the single specimen available. For further details con- 

 cerning the structure of the male genitalia, see Plate XVIII, 

 fig. 92. 



Female. Chaetotaxy of the head essentially as in the male 

 except that the bristles of the upper preantennal row may be 

 reduced in number (Plate XVIII, fig. 91) . Sternite VII divided 

 by a deep sinus into two more or less triangular lobes. Recepta- 

 culum seminis as in other members of the genus. For further 

 details concerning the structure of the female genitalia, see 

 Plate XVIII, fig. 93. 



Eastern host. Chipmunk (Tamias striatus lysteri 

 (Richardson) ) . 



Eastern localities. Massachusetts, Michigan, New York, 

 (Canada) . 



