246 SYRPHIDJ3, 



outstanding white hairs ; hind mai'gin of segment black. 3rd 

 segment with a similar pair of spots, but they are usually 

 smaller and are more or less distinctly separated in J » always 

 distinctly separate in 5 ; bind margin of segment wholly black. 

 4tb segment shining black, at each basal corner witli a small grey 

 spot which extends some way do\^n the margin and continues over 

 the side ; hind margin orange. All the spots in the 5 usually 

 smaller and more wliitish than yellowish. Genitalia in J rather 

 large, shining i)lack, basal section globular, uith minute white 

 hairs but not grey-dusted. Legs: coxae whitish-dusted, hind tro- 

 chanters shining black, with tiny spines; anterior legs mainly 

 orange, upper side of femora, and tips of tibiae, sometimes 

 blackish. Hind femora extremely incrassate, serrate below, the 

 serration being on the apical third situated on a ridge ; three or 

 four distinct small spines near tip ; generally shining black, orange 

 narrowly at base, and with an incomplete orange streak or ring of 

 varying width on under side about the middle. Hind tibiae 

 black, base and a ring beyond the middle, orange ; tarsi orange. 

 Legs in § more orange than in S • Wi)igs clear, subcostal cell 

 and stigma pale brownish-yellow ; squamae and halteres pale 

 yellow. 



Length, 8 mm. 



Described from a number of both sexes from various sources. 



This species is common and generally distributed in both hills 

 and plams in India. I have taken it myself at Mussoorie, 

 Dai'jiling and localities in the plains. Examples in the Indian 

 Museum are fi-om Mussoorie, Simla, Naini Tal and Agra. A 

 widely distributed species : Europe, Asia, Africa, Madeira and 

 Canaries, North America. 



191. Syritta orientalis, Macq. (PI. V, figs. 16, 17.) 



Syritta orieyitalis, Macquart, Dipt. Exot. ii, 2, p. 76 (1842) ; 



de Meijeiv, Tijd. v. Ent. li, p. 224, S 2 (1908). 

 Syritta illucidn, Walker, Proc. Linn. >Soc. iv, p. 121 (1860). 

 Senot/asfer Itdescens, Doleschall, Nat. Tijd. Ned. Ind. x, p. 410, 



pl.'xii, fig. 3(1856). 

 ? Syritta amboinensis, Dolescliall, op. cit. xvii, p. 97 (1858). 



This species differs from S. jjipiens by the abdominal spots on 

 the 2\\6. and 3rd segments being united to form respectively two 

 complete transverse bands, or else sejmrated by an indefinite, very 

 narrow, median black stripe on each segment. In many cases, 

 however, this median stripe is distinctly present and complete, 

 more especially in those specimens with wholly black hind femora, 

 and this fact tends to break down the barrier between orientalis 

 and inpiens. 



In specimens in which these median stripes are absent or very 

 indefinitely present, the hind femora are orange or brownish on 

 a considerable part of the under side up to the middle, where there 

 may or may not be an orange streak as in pipiens; but the whole 



