220 American Midland Naturalist Monograph No. 3 



single; trans-sutural (f) double or triple; supraorbital single or double. Body 

 spiculate. Upper lateral abdominal hairs single on segment III to V. Comb of 

 eighth segment of about 18 to 25 thorn-shaped scales in a patch; individual 

 scale with apical spine about twice as broad and generally about one and one- 

 third times as long as subapical spinules. Siphon about twice as long as wide; 

 pecten of numerous evenly spaced teeth, usually extending beyond middle of 

 siphon; subventral tujt multiple, inserted beyond pecten; dorsal preapical spine 

 less than half as long as apical pecten tooth. Anal segment wider than long, 

 completely ringed by the dorsal plate; lateral hair single; dorsal brush consist- 

 ing of a long lower caudal hair and a shorter multiple upper caudal tuft on 

 either side; ventral brush well-developed, confined to the barred area; gills 4, 

 longer than the anal segment, each tapering to a point. 



DISTRIBUTION. — Southern Canada; United States, south to South Carolina 

 and Louisiana, west to Colorado and Montana. Southern States: Arkansas 

 (31); Georgia (148); Kentucky (140); Louisiana (54); Missouri (1); North 

 Carolina (97); South Carolina (27); Tennessee (97); Virginia (49). 

 Other States: Colorado (89); Connecticut (21); District of Columbia 

 (52); Illinois (42); Indiana (76); Iowa (155, 156); Kansas (128); 

 Maine, Maryland and Massachusetts (52); Minnesota (131); Montana 

 (112); Nebraska (178); New Jersey (77); New Mexico (52); New York 

 (162); North Dakota (127); Oklahoma (159); Pennsylvania (8); Rhode 

 Island (99); Texas (108); West Virginia (54); Wisconsin (48); Wyoming 

 (129). 



BIONOMICS. — The females are fierce biters, attacking during daylight hours 

 when their haunts are invaded. Owen (131) states that the bite of this mos- 

 quito is the most painful he has experienced from any species in Minnesota. 

 Larvae of A. trivittatus occur mostly in flood-water pools along rivers and in 

 woodland pools. This species passes the winter in the egg stage and larvae may 

 be found any time during the summer following rains. 



Aedes (Finlaya) atropalpus (Coquillett) 



Culex atropalpus Coquillett, 1902, Can. Ent., 34:292. 



ADULT FEMALE. — Medium sized species. Head: Proboscis long, slender, 

 dark scaled; palpi short, dark. Occiput dorsally with a median patch of yellow 

 lanceolate scales, the patch broad posteriorly, narrowed anteriorly and project- 

 ing forward between the eyes; this dorso-median patch bounded submedially 

 by a large area of broad appressed white scales which extend far down the 

 sides, enclosing a lateral patch of broad dark scales. Pale erect forked scales 

 numerous on central portion of occiput. Thorax (Fig. 121C) : Integument of 

 scutum black, clothed dorsally with a very wide irregular longitudinal stripe 

 of fine dark bronzy-brown scales; this longitudinal dark stripe broadly margined 

 and partially interrupted by a lateral area of narrow pale-yellow to golden- 

 yellow scales; the lateral area of pale scales extends from the anterior margin 

 of the scutum to near the wing base and projects medio-posteriorly from the 

 region of the scutal angle along the prescutal-scutal suture. Prescutellar space 



