. Diptera Brachycera. Brachycera. GERON.—USIA. 281 proboscis black ; autennje black, relative length of joints as in arf/entifrons, tips of first two joints narrowly pale, with greyish hairs ; occiput black, with long yellow liairs above and greyish ones below ; hind margin of eyes with small white scales. Thorax velvet-black, dorsum covered with bright yellowish hairs, wliich are greyish on the grey shouldei's ; underside ash-grey, with long- grey hairs and some grey scales ; scutelluni black, yellow-haii'ed. Abdomen black, with minute bright yellow fine scales and hairs; hind margins of segm
. Diptera Brachycera. Brachycera. GERON.—USIA. 281 proboscis black ; autennje black, relative length of joints as in arf/entifrons, tips of first two joints narrowly pale, with greyish hairs ; occiput black, with long yellow liairs above and greyish ones below ; hind margin of eyes with small white scales. Thorax velvet-black, dorsum covered with bright yellowish hairs, wliich are greyish on the grey shouldei's ; underside ash-grey, with long- grey hairs and some grey scales ; scutelluni black, yellow-haii'ed. Abdomen black, with minute bright yellow fine scales and hairs; hind margins of segments with long defiexed grey hairs ; whole dorsum with long thin greyish pubescence, which is denser at the sides ; venter wholly covered with small silvery-white scales and long grey hairs. Ler/s with coxse and fore femora black, former with grey hairs ; posterior femora and all tibije pale tawny ; tarsi black, middle metatai'si more or less pale at base; legs almost. Fig. 18.—Gcron albescens, Bnin., wing. bare except for a few short hairs below femora and the usual minute tibial bristles. Wiii(js quite clear, Aeins pale yellowish on basal half; halteres yellowish, knobs bright pale yellow. Leii(/th, 5-S nun. liedescribed from the original type from Balugaou, Puri Distr., Orissa, 14. xii. 1908 {Caunter), and a second J fi'om Tambi, Satara Distr., JBonibay, 2100 it., 22-2(J. \v. W12 {Gravehj), both in the Indian Museum. ^.i-vThe only definite character by which this species differs from arffentlfrons seems to be the pale posterior femora in the 6 and the larger size. Geuus USIA, Latr. Usia, Latreille, Hist. Nat. Crust. Ins. xiv, p. 300 (1804). Volucella, Fabricius {nee Geoft'.), ]nt. Syst. iv, p. 412 (1794); id., Syst. Antl. p. 114 (1805) ; Meigen, Kla.*s. i, p. 194 (1804). Genoxype, Volucella jlovea, Y. (Europe); by Eondani's desig- nation. Rather small bare or nearly bare flies, sometimes of metallic ground-colonr, sometimes with yellow and black markings. Head hemisphei'
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Keywords: ., bookcentury1900, bookcollectionbiod, bookdecade1920, bookyear1920
