( l-' ) 



the tibia measnred along the ventral edge. The longest apical bristle of the second 

 segment does not reach to the apex of the third. The fifth segment of all the 

 tarsi bears fonr lateral bristles and one snbventral basal pair in between the first 

 lateral pair. The measurements of the mid- and hindtarsi are as follows ; — 



Modified Segments.— ;?. The eighth sternite (Pi. IX. fig. 28, viii. st.) is 

 large and almost comjiletely divided in the mesial line, each lobe bearing two rows 

 of long bristles ventrally at the apex and a number of short ones at the dorsal 

 apical edge. The process of the elasper (PI. IX. fig. 28, p) is triangular, 

 obtuse, bearing one bristle at the apex, another further down, and a few short ones 

 on the back. There are no bristles at the juncture of the elasper with the finger. 

 The latter is triangular, being widest at the apex. It bears two heavy long spines 

 in the npper third, and between them several short bristles (PL IX. fig. 28, f). 

 At the distal apical angle there is one long bristle, and in the middle of the upper 

 edge a second smaller one. The ninth sternite (ix. st.) is slender, bearing a number 

 of short hairs, as shown in the fignre. 



? . The apex of the seventh sternite is rounded (PI. IX. fig. 32, vii. st.). 

 The eighth tergite bears a row of bristles above the stigma and a patch of bristles 

 on the lower half as shown in the figure. At the apical edge there are two bristles 

 at the lower corner, and obliquely above them two short ones. The stylet is long 

 and slender, being at least five times as long as it is broad. At the corner of 

 the anal tergite just below the insertion of the stylet there is one single bristle. 



Length: c?, 2-2 mm. ; ?,2'8mm. 



We have four specimens of this species, collected by Mr. G. F. Dippie : — 



1 cJ, Red Deer, Alberta, Canada, August 21st, 1001. Microtus diummoixH. 



3 ¥?, „ ,, „ „ 28th, „ Ecotomi/s saturatiis. 



10. Ceratophyllus telegoni (PI. IX. figs. 27, 30). 



This species is closely related to ('. charlotti'nsis Baker, bnt difters in many 

 details, as described below. 



Head. — While C. charlottensis has a row of three bristles close to and in front 

 of tlie vestigial eye, and a dot (possibly the point of insertion of a small bristle) 

 just below the vestigial eye, the present species has a single l)ristle before the eye, 

 and further forward two rows of four or six bristles, the more frontal row ending at 

 the frontal corner of the head as in charlottensis, and the second row being more 

 distant from the vestigial eye than in that species. 



Thorax. — The mesosternnm and mesomernm have more bristles than in 

 charlottensis. On the episternnm of the metathorax there is a vertical row of 

 three bristles standing rather close together, while charlottensis possesses only 

 two widely separated bristles. The long bristle on the metasternum is accompanied 

 in charlottensis by a short one standing above it. In the j)resent species the 

 additional bristle is longer than in charlottensis, and there is another also below the 

 long bristle. 



