NO. 1361. REVISION OF AMERICAN SIPHONAPTERA— BAKER. 407 



to those, and a third I'ow of throe. Abdominal t(M-jifitos each with two 

 transverse rows of ])ristlos, tiie posterior of sixteen or eighteen larger 

 ones, the anterior of fewer and smaller bristle.s. Metanotum and first 

 four abdominal tcM-gitos eaeh with a small tooth on either side, Anto- 

 pygidial spines three on oacii side, the middle one of each group 

 searccly extending ovoi- pygidium. Beneath pygidiiim on either .side 

 stand two short bristles. Hind margin of lateral portion of eighth 

 segment with tvvo stout bi-istl(\s and anterior to these two smaller ones. 



Style twice longer than wide at tlie somewhat swollen base, narrow- 

 ing to a tip, where there is a long ))ristlo; back of tip there is a l)ristle 

 on upper margin and also one on lower mai'gin. 



Hind coxa without minute teeth on inner surface. Hind femur 

 with one small l^risth* on side. Apical spines on second hind tarsal 

 joint shorter than third joint. First pair of spines on last hind tarsal 

 joint inserted nearly in a line with the others, ))ut somewhat liont in- 

 ward. Lengths of mid tarsal joints in the proportions 1<)-13-T. 5-5-11. 



Length, 3.25 mm. Color, clear brown. 



Tyjje.— Cat. No. 6912, U.S.N.M. 



CERATOPHYLLUS CANADENSIS, new species. 

 Plate XX, figs. 1-4. 



Several years ago Dr. J. Fletcher sent me a single female specimen 

 from Ottawa, (^anada, which could not })e placed with any described 

 species. I was loath to descril)e it at that time, not having made 

 special studies of the female sexual characters, and especially because 

 the host was not given. It is characterized here in the hope that the 

 host will soon be determined and the male found. 



Head rapidly roundly sloping from occiput to frontal notch, which 

 IS rather low down on the front. Eye large, nearly elliptical in out- 

 line. Gena with a lower row of three stout bristles,, the middle 

 smallest; the second row is represented by two small })ristles in a line 

 above upper bristle of lower row. Gena below eve o])tusely pointed 

 posteriorly. Antennal groove reaching two-thirds the depth of the 

 head, rather strongly narrowed below, with a number of scattering 

 minute hairs along the posterior margin. The bristles on second 

 antennal joint are about five in number and nearly equal third joint. 

 On disk of vertex back of antennal groove stands one stout ])ristle. 

 Hind margin of head with the usual l)ri.stlos, but with a single stout one 

 at lower angle. Labial palpi nearly equaling antei'ior trochanters. 



Pronotum with a transverse row of a))out twelve ])ristles on pos- 

 terior third, the hind margin with a ctenidium of about twenty stout 

 spines. Meso- and metanotum each with two distinct rows of bristles 

 and some scattering small bristles in front of these; the post(M-ior vow 

 contains about twelve larger ])ristles, the m^xt more and smalliM- ones. 

 Metanotum with two small teeth on eith<>r side of hind margin, the 

 Proc. N. M. vol. xxvii -03 27 



