Carpenter et al.: Mosquitoes of Southern U. S. 227 



MEDICAL importance. — Laboratory experiments performed by the Har- 

 vard Medical School during 1939 showed that A. tnseriatus can transmit the 

 eastern variety of equine encephaHtis. Bennett et al. (16) were able to transmit 

 the virus of yellow fever experimentally with this species, but it is unimportant 

 as a vector since its range of distribution is outside the present endemic zones 

 of the disease. 



Aedes (Stegomyia) aegypti (Linnaeus) 1 



Culex aegypti Linnaeus, 1762, Hass. Pal. Reise, p. 470. 



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

 palpi short, dark, tipped with silvery-white scales. Clypeus and tori with broad 

 appressed silvery-white scales. Occiput clothed dorsally with a rather narrow 

 longitudinal stripe of broad white scales, extending anteriorly between the eyes; 

 this median stripe bounded on either side by a large submedian patch of broad 

 dark scales (the anterior margin of the submedian dark patch with a line of 

 narrow silvery-white scales bordering the eye) ; lateral region of occiput clothed 

 with a patch of broad white scales, the patch interrupted near its middle by a 

 smaller patch of dark scales. Erect forked scales pale, restricted to the dorso- 

 posterior portion of occiput. Thorax: Integument of scutum dark brown to 

 black, covered with narrow dark bronzy-brown scales except for a small patch 

 of narrow white scales at the middle of the anterior margin and a conspicuous 

 lyre-shaped pattern of pale scales. (The outer frame-work of the "lyre" con- 

 sisting of a pair of strong lines of rather broad silvery-white scales; these lines 

 broader, curved outward and crescent-shaped on the anterior half of scutum; 

 these lines narrower, submedian in position and straight on posterior half of 

 scutum and extending to posterior margin. The "strings" of the "lyre" con- 

 sisting of a pair of narrow straight submedian lines of slender yellowish-white 

 scales originating at the anterior margin of scutum and extending nearly to 

 prescutellar space) . Anterior pronotal lobe, posterior pronotum and lobes of 

 scutellum clothed with broad appressed white scales. Abdomen: Tergites dark 

 scaled, with narrow basal white bands dorsally and silvery-white basal patches 

 laterally. Venter white scaled except for the last two segments, which are prin- 

 cipally dark. Legs: Legs dark scaled, but with white knee spots, white streaks 

 on femora, and white-scaled basal rings on tarsal segments. Basal rings of hind 

 tarsi broad on segments 1 to 4; segment 5 entirely white. Basal rings of fore- 

 and mid-tarsi narrower than those of hind tarsi, present on only segments 1 and 

 2. Wing: Scales rather narrow, dark. 



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

 125E). Lobes of ninth tergite (IXT-L) large, triangular, clothed apically with 

 a few very small setae. Tenth sternite (X-S) prominent, moderately sclero- 

 tized, blunt apically, bearing a short ventral branch at basal third. Phallosome 

 (Ph) conical in dorsal view, a little more than twice as long as basal width, 

 open ventrally, closed dorsally at apical third; each plate with a row of strong 

 ventral teeth beyond middle, those at tip more numerous and projecting dor- 

 sally to form a crown at the apex of the phallosome. Claspette absent; inter- 



1 Stegomyia fasciata of authors. The reader is referred to Dyar (1928) and 

 Edwards (1932) for synonymy and references to this species. 



