Genus Culicada. 



369 



darker at the somewhat enlarged base and with a scanty tuft arising at 



the basal third. Labial plate broadly triangular, with twenty-five fine 



teeth. Thorax, lateral angles somewhat marked, and each bearing a group 



of compound, finely barbuled hairs. A 



similar group also occurs at the anterior 



angle, which is less sharply defined, and 



also on the dorsal surface. Hairs of body 



mostly simple, those on the first and 



second abdominal segments compound 



and weakly barbuled. Comb of eighth 



abdominal segment consists of fourteen 



to sixteen scales, each having a somewhat 



spatulate base and terminated by a stout 



spine, at the base of the latter on either 



side is a much smaller spine followed by 



a series of still smaller weaker ones. Anal 



segment, with a broad dorsal plate, 



extending nearly to the ventral line but 



not inclosing the segment. Air tube about 



two and a half times as long as broad 



tapering rather gradually to the apex 



with two posterior pecten, each consisting 



of about eighteen spines closely placed 



together and four others at a much 



greater distance. Each pecten tooth stout 



and with one or two denticulations ; dorsal surface of the air tube with a 



double row of hair-tufts, each consisting of about four tufts composed of 



a pair of weakly barbuled hairs. 



Habits. — This large species is a frequenter of woodland pools in the 

 vicinity of Albany, where it occurs with C. canadensis, C. imjpiger, 

 C. cantans, and Aedes fuscus. We believe the species winters in the 

 larval form (E. P. Felt)." 



Fig. 148. 



Air tube of Culicada cinereoborealis. 

 (After Felt.) 



The larva is said to resemble that of Culex impiger, but the 

 dorsal surface of the air tube has a double row of hairs, each row 

 consisting of about four tufts composed of a pair of weakly 

 barbuled hairs. It has been confused by Messrs. Dyar and 

 Knab (Ent. Soc. Wash. Proc. 6, 144, 1904) with that of 

 C. impiger with which it sometimes occurs. 



VOL. IV. 



2 B 



