AQUATIC INSECTS IN NEW YORK STATE 415 
are slight constant differences in the form of the air trumpet 
and in the number and arrangement of the abdominal hairs. 
Fresh specimens should however be examined in order to char- 
acterize them correctly. 
The arrangement of the bristles on the abdomen is about the 
Same in all the species examined. On the dorsal surface of the 
first abdominal segment are a pair of conspicuous stellate hairs, 
the remaining segments each have about three pairs of lateral 
discal hairs, and two pairs of small, branched, marginal ones; 
one of the marginal pairs of the eighth segment being many 
branched. Besides these there are usually a few scattered 
hairs. 
Much has been written about the species of this genus, but 
the fact that most of the older descriptions are inadequate 
renders the synonymy much involved. Coquillett has done the 
best and most recent work on the North American species; and 
the reader is referred to his papers published by the United 
States Department of Agriculture, or, better still, to his table 
given in Howard’s book on mosquitos, for the determination of 
the adults. In the last mentioned work will be found a most 
complete description of the life history of several species of 
mosquitos. The recent work of Theobald is a monograph of the 
Culicidae of the world. 
Dr Dyar has recently published in the Proceedings of the 
Washington Entomological Society (1902 and 1903) and in the 
Journal of the New York Entomological Society (1902 and 1903) 
the descriptions of the larvae of a number of species of Culex, 
together with keys for their identification. The following key 
is adapted from one given by him, modified to include species 
more recently described. 
KEY TO SPECIES OF CULEX LARVAE 
1 Without a longitudinal row of spines on the air tube; hair 
tufts of anal segment confined to the barred area; seventh 
segment with a round dorsal plate incised anteriorly...... 
signifer Coq. 
With a longitudinal row of spines or hair on the air tube...........-(2) 
2 Air tube at least four times as long as its breadth at the 
MEL EOMSUAR ENTS ORUAE Ate thet A GMa. goes acé cde re. vd’ eater a aow aout aay 9) aC inreb ai hi eime gay, ela teust AVES (8) 
Air tube less than three times as long aS DrOAd.......cacreevnvcees (9) 
3 Antennae with hair tuft beyond the middle of the joint.............(4) 
The antennal tit at or'before the middle... cc. terwcrncs visu vvnsen (8) 
4 Air tube six or more times as long as broad; antennae white 
Ge eer ee TR er Mya ae able wigud Kile np Oarw NAIR D A A KUO RO RE bags i659 take (5) 
