194 American Midland Naturalist Monograph No. 3 



(52); Georgia (96); Kentucky (140); Louisiana (52); Mississippi (96); 

 Missouri (128); North Carolina (166); South Carolina (64). Other States: 

 Texas (108). 



bionomics. — The females are vicious biters, attacking during the day in 

 or near wooded areas. They are occasionally encountered at night near dwell- 

 ings, but seldom enter houses. Larvae are found in temporary pools following 

 rains. Larval and adult collections have been recorded from March to Decem- 

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 records, 1942-1944, unpublished). 



Aedes (Ochlerotatus) mathesoni Middlekauff 



Aedes mathesoni Middlekauff, 1944, Proc. Ent. Soc. Wash., 46:42. 



adult female. — Medium sized species. Head: Proboscis long, slender, 

 black with faint purplish iridescence; palpi short, black, with purplish irides- 

 cence. Scales of postero-dorsal region of occiput white, lanceolate, arranged in 

 a sub-triangular patch projecting anteriorly on the mid-line; scales of submedian 

 areas between the postero-dorsal patch and eye margins black, lanceolate; later- 

 al region of occiput clothed with broad appressed yellowish-white scales sur- 

 rounding a small patch of broad appressed dark scales. Dark erect forked 

 scales numerous on central portion of occiput. Thorax: Integument of scutum 

 dark brown, clothed with narrow bronzy-black scales except for the following 

 markings : A very narrow median longitudinal line of fine slender golden-brown 

 scales; a narrow elongate patch of lanceolate yellow-white scales on the anterior 

 angles and a similar patch laterally near middle; a few lanceolate yellowish- 

 white scales laterally just above wing base; a few lanceolate yellowish-white 

 scales on prescutellar space. Abdomen: Tergites uniformly purplish-black 

 dorsally, with small triangular basal white-scaled patches laterally. Sternites 

 white scaled basally, black scaled apically. Legs: Hind leg black scaled with 

 purplish reflection except for pale inner surface of femur; a white knee spot; 

 narrow white rings basally and apically on tarsal segments 1 and 2, basally on 

 segment 3. Fore and middle legs each similarly marked, but with pale area on 

 inner surface of femur usually less extensive and with tarsal rings restricted to 

 the base and apex of segment 1 and base of segment 2. Wings: Scales narrow, 

 purplish-black. 



ADULT male. — Coloration similar to that of female. TERMINALia. The 

 male terminalia appears to be identical with that of A. canadensis (Fig. 90). 



LARVA. — Unknown. 



distribution. — Known only from a few specimens collected in Florida 

 (123). 



bionomics. — Nothing is known of the habits of this species. Melanistic 

 forms of A. canadensis nearly as dark as A. mathesoni have been recently 

 collected in Florida. It may be possible that A. mathesoni represents an extreme 

 in melanism of A. canadensis; therefore its validity is questionable until addi- 

 tional specimens are available. 



