214 American Midland Naturalist Monograph No. 3 



medially; terminal claw (Ds-C) slender, about one-sixth as long as dististyle. 



larva. (Fig. 116). — Head broader than long. Antenna nearly as long as 

 head, slender, curved, spinose; antennal tuft multiple, inserted near middle of 

 shaft, reaching tip. Inner preclypeal spines long, slender, lightly pigmented, 

 separated by more than the length of one spine. Head hairs: Preantennal (A), 

 lower (B), and upper (C) multiple, barbed, inserted nearly in a straight line; 

 sutural (e) long, single; trans-sutural (f) and supraorbital 2-branched. Upper 

 lateral abdominal hairs 3 to 4-branched on segments I and II, double on seg- 

 ments III to VI. Comb of eighth segment of more than 20 scales in a patch; 

 individual scale fringed with fairly stout spines, the apical spine somewhat 

 longer and stouter. Siphon about four and one-half to five times as long as 

 wide; pecten of numerous evenly spaced teeth not reaching middle of siphon; 

 subventral tuft 5 to 7-branched, inserted beyond pecten. Anal segment longer 

 than wide, nearly ringed by the dorsal plate; lateral hair single; dorsal brush 

 consisting of a long lower caudal hair and a shorter multiple upper caudal tuft 

 on either side; ventral brush well-developed, with two or three small tufts pre- 

 ceding the barred area; gills 4, somewhat shorter than the anal segment. 



DISTRIBUTION. — Southern United States west to Texas. Southern States: 

 Alabama (170); Arkansas (30); Florida (125); Georgia (96); Kentucky 

 (140); Louisiana (24); Mississippi (54); Missouri (52); North Carolina 

 (166); South Carolina (125); Tennessee (35). Other State: Texas (141). 



BIONOMICS. — The adults of this species are found during the spring in 

 thickets and woodlands near their breeding places and are fierce biters, attack- 

 ing even at midday. Hollow stumps and tree cavities are favorite resting places 

 for the adults. Larvae are found in the hollow bases of gum trees following the 

 flooding of lowland areas. Carpenter (30) states that he has found larvae of 

 A. thibaulti in other kinds of trees on only two occasions. It is believed that 

 very few trees, other than gum, have the type of cavities favorable for their 

 breeding. Larvae of A. thibaulti have been collected from December to May in 

 the South (4th Sv. C. Med. Lab. records, 1942-1944, unpublished). 



Aedes (Ochlerotatus) TORMENTOR Dyar and Knab 



Aedes tormentor Dyar and Knab, 1906, Jour. N. Y. Ent. Soc, 14:191. 



ADULT FEMALE. — The female cannot be separated at this time from Aedes 

 atlanticus. 



ADULT MALE. — Coloration similar to that of female, terminalia (Fig. 

 117). Lobes of ninth tergite (IXT-L) about three-fourths as broad as long, 

 separated by slightly less than the width of one lobe, each bearing several short 

 spines. Tenth sternite (X-S) prominent, heavily sclerotized beyond middle. 

 Phallosome (Ph) about three-fifths as broad as long, stoutly conical, rounded 

 apically, open ventrally, closed dorsally. Claspette stem (Cl-S) pilose basally, 

 glabrous toward apex, slender, sinuous, extending a little beyond middle of 

 basistyle; claspette filament (Cl-F) about two-fifths as long as stem, striated, 

 curved and tapered at apical third. Basistyle (Bs) about four times as long as 



