312 SCENOPINIDvE. 



front margins of some of the middle segments white in the rf ; 

 genitalia in <S large. Legs short, stout, bare ; fore femora shorter 

 and thicker, a few bristly hairs at tips of tibiae ; two small 

 pulvilli, empodiam reduced to a bristle. Wings with a reduced 

 venation ; costa ending before tip of: wing, ambient vein dying away 

 beyond the tip; auxiliary vein short; 1st and 2nd veins normal; 

 3rd beginning at middle of wing, widely forked at half its length ; 

 anterior cross-vein at middle of discal cell ; 4th vein with upper 

 branch ending before wing-tip, lower branch forming basal and 

 hinder sides of discal cell ; discal cross-vein closing discal cell ; 

 5th vein forked, upper branch very short, ending in lower inner 

 angle of discal cell; lower branch turned down rather suddenly, 

 meeting anal vein at some distance before border, closing anal 

 cell ; 1st basal cell much longer than 2nd; two submarginal, three 

 posterior cells, 1st narrowed at tip; alulae well developed; alar 

 squama? small, thoracic pair hardly developed ; halteres small, 

 knobs large. 



Range. Europe, Egypt, India, Surinam, Hawaii, N. America. 



Life-history. See S. fenestralis. 



249. Scenopixms fenestralis, L. * 



Musca fenestralis, Linne, Syst. Nat. ed. x, p. 597 (1758). 

 Scenopinns fenestralis, auctt. 



Head, in S , dull black, densely and coarsely punctate ; frons 

 elongate triangular, almost bare; eyes bare, contiguous for some 

 distance, upper facets larger than and sharply divided from 

 lower ones ; vertex practically bare ; face reduced to a narrow 

 margin owing to the very small mouth-opening ; antennas 

 brownish yellow or nearly blackish, inserted in a small depression, 

 1st joint very short, 2nd short, transverse, almost bare, 3rd 

 subulate, four times as long as 1st and 2nd together, slightly 

 narrowed at its blunt tip, where there is a small depression or 

 pit. In 5 , frons one-fifth of the head, roughened by coarse 

 punctation and striae radiating from the lower ocellus ; generally 

 an impressed vertical median line and minute pale pubescence; 

 eye-margins very distinct, rather puffed out behind on upper part, 

 shining black, sometimes grey-dusted ; eyes with a transverse 

 purple band across the middle in life ; occiput very concave. 

 Thorax dull black, with minute scale-like greyish pubescence ; 

 humeri and posterior calli more or less chestnut-brown ; pleurae 

 comparatively shining, due to finer punctation, and bearing 

 longer pubescence; both these characters more conspicuous on 

 the sternopleurae ; pteropleurae shining black, bare. Scutellum 

 like dorsum of thorax, generally a little dark chestnut-brown on 

 underside. Abdomen longer than thorax, shining black ; 2nd seg- 

 ment twice as long as any other ; extreme basal margins in the 



* For a very long list of references to this species and for twelve synon)m3, 

 see Kertesz, Kat. Dipt, v, p 172 



