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SMJ'IIf AND GROSS BECK— MOSQUITO /.ARISE 
DESCRIPTIONS OF SOME MOSQUITO LARV.R, WI TH NOTES 
ON THEIR HA BETS. 
HY JOHN [!. SMITH ANI> JOHN A. ORC^SSBKCK. 
The larvEe here described are figured with structural details in a forthcoming 
report of the New Jersey Eixperiment Station, on the “Mosquito Investigations”; 
but as that report will appear later than was expected, it is deemed best to give a 
few notes with descriptions of heretofore undescribed larva; in advance. 'The 
descriptions were drawn up by Mr. Grossbeck from office material: the notes and 
comments are by the senior author. 
Ct/Tx Coq. 
Larva; of this species were first taken in .April, 1903, by Mr. Grossbeck near 
Paterson, N. ]., in woodland pools associated with Culex canadensis. 'They were 
recognized as distinct from any other that we had met with, but were not bred. 
May and., of the following year Mr. Van Deursen, another assistant, brought in a 
lot of what were accepted as full grown C. canadensis larva;, collected in the woods 
near New Brunswick, N. J. Pupation began May 3rd, and adults commenced to 
issue May 7. May 9, a male sijnatniger was found with the canadensis, and an 
examination of the breeding jar resulted in the discovery of one squamij^er larva 
and its identification with the Paterson form. No other adults hatched from the 
pupa;. .Another collection was made May i6, mostly pupa; of canadensis, but 
amongst them were some very large ones. From this lot 3 S and 2 9 squamiger 
emerged May 17; 5 $ and 4 9 May 18, and 2 $ , the last of the lot, on May 19. 
( )ther collections in the same locality were made at intervals throughout the 
season; but no more larvae were found. 'This indicates a single brood; further- 
more, adults were taken up to the middle of July, the late ones being so worn as to 
be almost unrecognizable. 
The larva in general appearance resembles Cnlex canadensis-, but is much 
larger, measuring 12-14 mm., in length, exclusive of the anal siphon. It is dirty 
gray in color, excepting the head and siphon. 'The head is almost as broad as 
long, widest immediately below the eye.s, tapering without curve to beyond the 
base of the antenna, flattened in front, light brown in color, and with four small 
black spots near the base of the vertex. On the anterior part of the vertex are 
four apparently single hairs, each arising from separate pits; the pits so placed 
as to form a square, slightly narrower in front; directly opposite the posterior pair. 
