EENEST E. ACSTEN— DIPTERA. 95 



Wollaston, one of the members of the Ruweuzori Expedition, of which he has recently 

 published a fascinating account *. 



In spite of the variation exhibited by the series of specimens enumerated above, as 

 regards the presence or absence — partial or complete — of the spots on the abdomen 

 and the dark area on the anterior portion of the proximal half of the wing, it is 

 impossible to regard the differenced as anything more than individual. As regards 

 the abdominal markings, at any rate, somewhat similar differences are exhibited by 

 Dejeania capensis Eob.-Desv. (? = Dejeania {Stomoxys) homhylans Fabr.), a widely 

 distributed species in Central and South Africa, which can readily be distinguished 

 from B. wollastonii owing to the general chrome-yellow colour of the body, by contrast 

 with which the black abdominal spots are much more conspicuous. 



Sericophoromtia f , gen. n. 



Allied to Chaetolyga J Bond., but distinguished by the claws and joulvilli of the 6 not 

 being elongate, and by the special character of the thoracic hair, or a portion thereof. — 

 Stoutly built, thick-set flies, with densely hairy eyes, and thorax {dorsum or pleurae, or 

 both) thicMy clothed between the macrochcetce with fine, yellowish, silky hair, often 

 crinkled, especially on pleurae. Face more or less hairy ; scutellum se^ni-translucent ; 

 hind tibim ciliated. 



Head -. front moderately prominent, in 6 of moderate width or rather narrow ; 

 vertical bristles present in both sexes ; ocellar bristles directed forwards and outwards ; 

 S without, ? with 2 orbital (fronto- orbital) bristles on each side ; sides of face (para- 

 facials of Townsend) of moderate width, or rather narrow; depth of jowls one-eighth 

 to one-sixth or one-fifth of that of eye, lower margin of head straight ; facial angles 

 close to margin of buccal cavity, interspace not constricted ; facial ridges ciliated 

 on lower third, or to above middle ; third joint of antennce long, and of moderate 

 or considerable breadth, from three to four times as long as second, penultimate 

 joint of arista not elongate. Thorax : dorsum without distinct longitudinal stripes. 

 Abdomen -. macrochsetas marginal. 



Typical species : Tachina dasyops Wied. (Anal. Ent. p. 42, and Aussereuropaische 

 zweifliigelige Insekten, ii. 1830, p. 308 ; Chcetolyga dasyops Br. & v. Berg, Denkschr. 

 der math.-naturw. CI. der k. Akad. Wiss., Wien, 1891, p. 402); S. and E. Africa ; 

 Aden, Arabia. 



* ' Prom Euwenzori to the Congo. A Naturalist's Journey Across Africa.' By A. F. R. Wollaston. 

 With Illustrations. (London : John Murray, Albemarle Street, W. 1908.) 



t (77]piKo(j)6pos, silk-bearing (alluding to the character of the fine hair on the thorax) ; fivla, a fly. 



t In the ' Katalog der Palaarktisohen Dipteren,' Bd. iii., by Dr. M. Bezzi and P. Stein (Budapest : 1907), 

 p. 229, this genus is reduced to the rank of a section of the genus Winthemia Rob.-Desv. (' Essai sur les 

 Myodaires,' 1830, p. 173), which, however, was so briefly and imperfectly characterised by its author that 

 it cannot fairly be regarded as having beea described at all ; I therefore see no valid reason for allowing 

 CJiatali/ga Rend, to be superseded. 



