Dideopsis aegrota (Fabricius) (=Asarcina aegrota (Fabricius), Asarkina aegrota (Fabricius))

Diptera: Syrphidae: Syrphini

Adult medium to large in size. Eyes dark reddish, glabrous, holoptic in male. Mesonotum black and shiny, anteriorly with a distinct collar of long, erect, bright yellowish hairs. Scutellum yellowish, anterior and median areas translucent, with a median pair of thin yellowish stripes; subscutellar fringe of hairs present. Abdomen dorsally convex and broad, with a strong margin; with a black and yellow pattern as follows: tergite 1 black, tergite 2 with a pair of oblique oval, yellowish spots on either side of middle, tergite 3 with anterior half yellowish and posterior half black; tergite 4 similar but with narrower yellow band, posterior margin yellow; tergite 5 black; hairs on abdomen black except on anterior portions of tergites 2 and 3. Fore and middle legs with coxae dark brown, remaining parts more or less yellowish, except tarsi darker, brownish; hind legs completely blackish brown.

Wings without sclerotised dots on posterior margin; with a characteristic, broad, dark band across middle, apical portion hyaline. Halteres yellowish. Vein R4+5 straight. Metasternum bare. Hind coxal tuft of hairs present.

   Adult male
     Larva
     Pupa

Widely distributed allover India (Arunachal Pradesh; Assam; Kerala; Karnataka; Meghalaya; Manipur; Madhya Pradesh; Sikkim; Tamil Nadu; Uttar Pradesh; West Bengal) (Ghorpade, 1994). Sri Lanka. Bangladesh. Nepal. China.

Aphis spiraecola (as A. citricola), A. craccivora, A. gossypii, Pentalonia nigronervosa, Rhopalosiphum maidis, Toxoptera aurantii, T. citricida, T. odinae, aphids on  citrus and Artemisia vulgaris (Ghorpade, 1981).