256 American Midland Naturalist Monograph No. 3 



occasionally double; second and third tufts usually double or triple and inserted 

 somewhat laterally; distal tuft small, usually double). Anal segment longer 

 than wide, completely ringed by the dorsal piste; lateral hair double, sometimes 

 single; dorsal brush consisting of a long lower caudal hair and a shorter 3- 

 branched upper caudal tuft on either side; ventral brush well-developed, con- 

 fined to the barred area; gills 4, as long as the segment or longer, each tapering 

 to a blunt point. 



distribution. — Eastern United States, north to Massachusetts and west 

 to Utah. Southern States: Alabama (170); Arkansas (30); Florida and Geor- 

 gia (96); Kentucky (140); Louisiana (96); Mississippi (97); Missouri (1); 

 North Carolina (166); South Carolina (64); Tennessee (97); Virginia (49). 

 Other States: Colorado (128); Connecticut (90); Delaware (106); District 

 of Columbia and Illinois (52); Iowa (155, 156); Kansas (128); Maryland 

 (19); Massachusetts (52); Michigan (88); Minnesota (131); Nebraska 

 (178); New Jersey (77); New Mexico (9); Oklahoma (159); Pennsylvania 

 (52); Rhode Island (99); Texas (108); Utah (142) ; Wisconsin (48). 



bionomics. — The adults are frequently found in outbuildings and other 

 daytime resting places. The females bite readily outdoors and occasionally enter 

 dwellings to bite. Larvae occur in grassy pools, either fresh or brackish water, 

 in ditches, ponds and occasionally in rain barrels. Larvae and adults of Culex 

 salinarius occur throughout the year in the extreme South, but are more com- 

 mon from April to October farther north (4th Sv. C. Med. Lab. records, 

 1942-1944, unpublished). 



Culex (Culex) tarsalis Coquillett 



Culex tarsalis Coquillett, 1896, Can. Ent., 28:43. 



ADULT FEMALE. — Medium sized species. Head: Proboscis dark scaled, with 

 a rather broad white band medially; palpus short, dark except for a few white 

 scales at tip and at apex of third segment. Scales of postero-dorsal region of 

 occiput narrow, white, arranged in a triangular patch projecting anteriorly on 

 the mid line; scales dorsally margining eyes narrow, white; scales of submedian 

 areas between the postero-dorsal patch and eye margins narrow, golden brown. 

 Lateral regions of occiput clothed with broad whitish scales. Erect forked scales 

 numerous on dorsal surface of occiput, those on central portion pale. Thorax: 

 Integument of scutum dark brown, clothed dorsally with golden-brown lanceo- 

 late scales, narrowly margined anteriorly and laterally with white lanceolate 

 scales. Prescutellar space mostly white scaled, bordered on either side by a 

 narrow submedian white line extending anteriorly to near middle of scutum 

 and terminating in a small white submedian spot (this line may be disrupted 

 near the submedian spot by brown scales) . Pleura with a few patches of broad 

 white scales. Abdomen: First tergite mostly pale scaled; remaining tergites 

 with prominent basal bands of white to whitish-yellow scales (these scales may 

 extend toward the posterior margin on the median line, particularly on second 

 segment) ; the terminal segments often with apical pale scaling as well as basal, 

 the eighth segment frequently entirely pale scaled. Venter pale scaled, with a 

 V-shaped marking of dark scales on each sternite, the base of the V at the 



