110 THE CANADIAN ENTOMOLOGIST. 



in posterior tarsi joint 5 equals 2, equals twice 4, and equals 

 one-half of i ; colour light brown; length: female, 2-2.5 mm.; male, 

 3 mm fasciatus. 



EE. Male claspers armed with short black teeth ; head evenly rounded 

 in female, flat above, rounded in front in male ; first row of bristles 

 on each side of dorsum of abdominal segments with 5 bristles, 

 second row with 6, ventral segments on each side with 3 or 4 ; 

 in anterior tarsi joint 5 as long or longer than 3 and 4 together ; 

 in middle tarsi joint 5 equals i or less, equals 2 or more, and 

 equals 3 and 4 together or less ; on hind tarsi joint 5 equals two- 

 thirds to three-fourths of 2, equals twice 4, and equals 3 or 

 more, 2 is less than three times 4, while i equals twice 5 or 

 more ; light brown, more or less dark dorsally on abdomen; length: 

 male, 1.75-2 mm.; female, 2.25-2.5 mm Howardii, n. sp. 



F. Bristles on second antennal joint shorter than joint 3; maxillary palpi 

 in male with joint 2 nearly as long as 4 ; head in male flat on top, 

 rounded in front; pronotal comb of iS spines; first two or three 

 abdominal segments without minute teeth on discs above; first and 

 second dorsal rows of bristles on segments of the abdomen each 

 with about 7 bristles on either side, ventral rows with about 4 on 

 either side; first claspers in male with long heavy bristles, but with- 

 out short black teeth ; in posterior tarsi joint 5 about equals 3, 

 while I is longer than 2, longer than 3 and 4 together and more 

 than three and a-half times the length of 5 ; head, thorax 

 and legs light brown, abdomen reddish brown ; length : male, 



3 mm coloradensis, n. sp. 



FF. Bristles on second antennal joint longer than joint 3; eye very small, 

 almost obsolete ; maxillary palpi in female with joint 2 as long as 



4 ; head in female evenly rounded from occiput to mouth ; pronotal 

 comb of 20 spines ; first two or three abdominal segments with 

 several short minute teeth on discs above ; bristles on abdomen as 

 follows: first row on dorsum of each segment with 12 to 14 on 

 either side, second row with 11 to 12 on either side, each ventral 

 row with about 6 on either side ; in posterior tarsi joint 5 is 

 shorter than 3, i nearly as long as 2 and 3 together and less 

 than 3 and 5 together ; uniform light brown ; length: female, 

 2,5 mm ignotus, n. sp. 



