320 THE CANADIAN" ENTOMOLOGIST. 



epistomal hair double or single, lower larger, single, both flattened, 



neither reaching to the anterior border of head. Anteantennal hair with 



five or six divisions, flattened. Thorax coarsely pilose along the anterior 



and lateral aspects. Abdomen finely pilose, more densely at the insertion 



of the lateral hairs and near the comb. Lateral hairs long, five on each 



side of the first segment, three on the second, paired on the hinder 



segments. Comb of lo-i 2 well-separated bars in a curved row, upper 



ones smaller, smallest about one-third length of longest. Each scale has 



a line of fine hairs on each side, most marked on the swollen basal portion. 



Air tube subconical, with a slight curve forward, about five times as long 



as broad (at the base). A pair of hooks at the tip, each with a fine curved 



tooth at the middle. Eight or nine pairs of long hairs along the posterior 



suiface, each with 4-5 divisions ; upj^er shorter, two pairs within the lines 



of insertion of the pecten teeth. Lines of pecten teeth insertions reach up 



one-quarter of the tube ; teeth about nine pairs, upper very long, tips of 



the highest approach the middle of the tube, each tooth narrow, flattened, 

 slightly curved, with many fine seta? along its inner border. Two pairs of 

 small compound hairs on each side of the tube, one near the middle, the 

 other within the upper quarter. Band ringing the anal segment about as 

 long as broad. Ventral group of hairs spring from a separate barred area. 

 Dorsal group of two pairs of very long simple, nearly equal, hairs. Anal 

 gills with prominent tracheae, elongated, narrow, unequal, lower pair 

 longest, half as long again as the ventral hair group. Pupa with rather 

 long, deeply-infuscated siphons. 



Observations. — The larva? of this species, belonging to Dyar and 

 Knab's interesting new genus, Adochlostyrax, were collected in the same 

 locality as the preceding. They were placed in a separate jar, with an 

 abundance of Crustacea and Infusoria, and developed rapidly. The usual 

 position of the larva was on its back at the bottom of the jar or hooked up 

 on the sides by its siphon. It apparently never rose to the surface except 

 just before pupating. The adults bear a strong superficial resemblance to 

 the small swamp mosquito, Melanoconian atrat7ts, Theo., the venation and 

 form of the wing scales being ])recisely similar. The description of the 

 adults was drawn up from freshly-killed specimens. 



Mailed Seplembei 7th, 1906. 



