( 321 ) 



The eighth tergite of the female, as seen in the mounted specimen, is 

 represented by fig. 12. The hairs are nnmerons. 



Length 2'0 mm. 



We received twelve specimens, 11 male and 9 female, of this interesting species 

 from Mr. G. F. Dippie. They were taken from Mi/odes lucifugus on July 2nd, 

 lOllO, near Waterloo, Outario, Canada. 



5. Ceratopsylla wolfiFsohni spec. nov. (PI. IX. fig. 13; PI. X. fig. 14—16). 



Head. — The anterior part of the head is shorter, and the second frontal flap 

 slenderer, than in C. insiynis. Tbe liead in other respects is similar to the head 

 of tliat species. 



Thorax. — The pronotal comb consists of from twenty-seven to twenty-nine 

 teeth. The mesonotnm has two slender bristle-like teeth on each side before 

 the aj)e.\. On the metanotum there are laterally at the edge two short strongly 

 chitinised teeth. Aliove these the segment is sinnate, so that the bristles of the 

 snbapical series become apical (fig. 13), resembling a comb as in insignis. The 

 epimernra of the metathorax has two or three proximal hairs, a longer hair 

 behind the stigma, another still longer placed farther down, and two more at 

 the hinder edge (fig. 13). 



Abdomen. — The first abdominal tergite resembles the metanotnm in strnctnre. 

 The dorsal apical bristles, however, are still more tooth-like. On the other tergites 

 the long bristles remain normal in position and length. The fourth, fifth and 

 si.'cth tergites have only two small hairs in front of tbe row of bristles. The 

 seventh tergite bears on each side one long apical bristle, which is sitnated on 

 a cone, and has on each side of it a very small hair. 



The sternites of the fourth, fifth and sixth segments have in the male one 

 hair and in the female four hairs on each side ; the sternite of the seventh 

 segment, however, bears a few more hairs in addition to these in both sexes. 



Iiegs. — The legs of this insect resemble those of C. insignis. 



Modified Segments. — The eighth tergite of the male is strongly rounded- 

 dilated anad, and bears a patch of bristles at tbe apex. At the upper edge of 

 "the dilated portion of the te]gite (fig. 14) there is a row of short hairs, while the 

 obliijne ventral edge is minutely serrate. The eighth sternite (fig. 15) is small and 

 gradually widened anad, bearing at the apical edge a row of bristles placed closely 

 together. Above this sternite there are two pieces of chitin, densely clothed with 

 long fine hairs, being brush-like in appearance. These brushes represent appa- 

 rently the ninth sternite. The clasper (fig. 16) is jirodueed into a somewhat 

 ellijitical process (P), which bears at the end two long bristles. The movable 

 finger (F) is not longer than this process, but much broader, being triangular, 

 with the ventral edge shortest and the hinder edge longest. The finger has no 

 long hairs, and is, in optical section, dorsal of the process of the clasper. 



Th(! eighth tergite of the female is similar to that of C. insignis, but some 

 of the hairs are absent. 



Length 2-1 mm. 



We have received a very large series of this flea from Mr. William Foster, 

 taken near iSa[iu(',ay, Paraguay (fg/ie), from various hosts — Mi/otis nigricans, M. 

 albescens, etc., etc. Mr. .1. A. Woltfsohn, in whose honour this species is named, 

 also forwarded us two female sjjecimens taken from Vespertilio nigricans at 

 Valparaiso, Chili. 



