THE CANADIAN ENTOMOLOGIST. 187 



of 3 to 5 spines on either side ; pronotum with a comb, abdo- 

 men without any G. 



AA. Head elongated and slender ; maxillae quadrangular ; head comb 

 of two thick blunt spines on either side ; pronotum with a 

 comb, abdomen usually with one or more ; in middle tarsi joint 



2 as long as 3 and 4 together ; in hind tarsi joint 2 as long as 



3 and 4 together, and 3 as long as 5 ; living on bats B. 



B. Abdomen without combs; pronolal comb of 10 spines on either 



side ; metanotum with 2 very small teeth on either side ; tarsal 

 joints all very narrow ; in anterior tarsi joint i as long as 2 and 

 3 together, 3 as long as 5 and somewhat more than one-half as 

 long as 2, which is one-third shorter than i, while 4 is one-half 

 as long as 2 ; in hind tarsi joint i as long as all remaining joints 



together and as long as tibiae ; length, 3 mm unipectinata. 



BB. Abdomen with one or more comb-bearing segments C. 



C. Abdomen with i to 5 comb-bearing segments D. 



CC. Abdomen with 7 comb-bearing segments; first 4 with 9 spines on 



a side, last 3 with 5 on a side ; each segment bearing a single 

 row of bristles ; eyes entirely absent ; antennal groove in hinder 

 half of head ; maxilte narrow, almost rectangular ; joint i of 

 maxillary palpi longer than either of last three ; pronotal comb 

 of 14 spines on either side ; metanotum with 12 short teeth on 

 either side ; legs slender and thin, proximal end of first femora 

 with 7 very small teeth ; in anterior tarsi joint 4 is the shortest, 



2 is as long as 5, but much more slender, 3 about as long as i ; 

 in middle tarsi joint 5 is longer than 2 ; in posterior tarsi joint 

 I is one-third longer than 5, which is as long as 2 and as long as 



3 and 4 together ; male claspers lamellar and rounded on upper 

 edge; colour, yellowish-brown ; length, 2.5-3 'cax^'^- • octactemis. 



D. Abdomen with i comb-bearing segment F. 



DD. Abdomen with 3 or 5 comb-bearing segments E. 



E. Abdomen with 5 comb-bearing segments; 3 of the abdominal 



combs with 12 spines on either side; pronotal comb of 12 

 spines on either side; metanotum with 7 teeth on eiiher side ; 

 all other details same as in odadenus ; length, 2 mm., hexadenus. 



EE. Abdomen with 3 (the first, second and seventh) comb-bearing 

 segments, each comb with 10 to 12 spines -on a side; those on 

 first and second short and thick, on the seventh thin and sharp; 



