Photo Courtesy of Jason Williams

Photo Courtesy of Jason Williams

Medium to large size mosquito

Proboscis: dark-scaled, except for a very wide yellowish-white median band;

Palpi: short, dark, apical half of segment 4 white.

Head: Occiput clothed dorsally with narrow white to pale-violet scales and numerous black erect forked scales; a dorsolateral patch of broad flat dark scales followed by broad dingy-white to light-brown scales laterally. Tori light-brown, inner surface darker and clothed with grayish-white scales.

Thorax: Integument of scutum dull black; scutum clothed with fine narrow bronze-brown to blackish scales, except for lavender-tinted narrow white scales on the prescutellar space, the anterolateral angle of scutum, a streak on scutal angle, a patch above wing base, and a small submedian spot near middle of scutum. Scutellum with long narrow whitish scales and dark setae on the lobes. Pleura with patches of broad appressed whitish scales.

Abdomen: 1st tergite with a median patch of grayish-white scales; remaining tergites dark, with white to pale-yellow-scaled apical markings, triangular in shape on 2 and 3, divided into paired submedian patches on 4 to 7. Venter with intermixed dark and pale scales.

Legs: Femora dark-brown to black-scaled, liberally speckled with white scales, posterior surface largely pale-scaled; each femur with a narrow subapical white-scaled ring; knee spots white. Tibiae black, with numerous small white-scaled spots on outer surface. Hind tarsi with a broad basal white ring on each segment, first segment with a median white ring as well; front and middle tarsi similarly marked, but with white rings reduced or lacking on segment 4, absent on 5.

Wings: length 4.0 to 4.5 mm. Scales rather broad, speckled dark brown and white, the white scales in no definite pattern; fringe entirely dark.

Bionomics: The females lay their eggs on damp soil subject to flooding by rainfall or overflow from streams and irrigation canals. They overwinter in egg stage. Rank low-growing vegetation is ideal oviposition site. The larval period is usually 4 to 10 days. The adults are attracted to light and flight range is 1 to 5 miles. They take blood meals from man, medium and large size animals (cows, horses, pigs, dogs etc.). They are persistent biters and will attack day or night and even in direct sunlight. It is sometimes called the dark rice-field mosquito because they are so abundant in and near rice fields.