40 [February, 



$ $ only, it will follow that impregnation must take place in the 

 autumn. At that time, however, most, if not all, of the specimens 

 are ochreous, and thus it would appear that a change of colour must 

 occur during the winter. This is a matter, however, upon which 

 further observations are much needed. 



56, Cecil Park, Crouch End, N. : 

 January 4th, 1911. 



A NEW SPECIES OF ANTHOMYZA (A. BIFASCIATA). 



BY JOHN H. WOOD, M.B. 



A very eleo-ant and distinct species, with banded wings : — Thorax di\llisli 

 yellow, usually niaro-ined on each side of the back with a narrow black line ; 

 pleuraj with two conspicuous black bands, the upper one broad and running 

 the whole length, the under narrower and abbreviated in front ; scutelliuu 

 dusky yellow. Abdonaen of male brown, at the base more or less yellow above ; 

 of female yellow, with broad brown bands on the hind margins. Frons yellow, 

 bordered narrowly with white, jowls silvery white, two pairs of vibrissa. An- 

 tennae yellow, 3rd joint sometimes darkened on upper-side, arista sub-pectinate. 

 Wings milky-white, crossed by two dark grey bands ; the first, nearly in the 

 centre, is narrow at the two ends and wide in the middle, reaching as far in- 

 wards as the small cross-vein, the second covers the whole outer fifth of the 

 wing, there is also a dusky spot at the base of the basal cells. Legs yellow, 

 the outer half of the femora more or less distinctly blackened, especially in the 

 two hind pairs, and the tibiae of these same pairs somewhat dusky at the base ; 

 terminal joint of tarsi black. Front femora without the usual short black 

 spine beneath. 



The subpectinate arista, prettily banded wings, and partially- 

 darkened legs give it an appearance totally unlike the ordinary run of 

 an Anthomyza, and in these days of dividing and subdividing some 

 might perhaps advocate erecting it into a separate genus. But in all 

 essential points of form, structure, and chaetotaxy this species is an 

 Antliomyza, and there I would place it. 



[ have only met with A. bifasciata at one restricted spot. This is a 

 small pool, which was drained some years ago, but still remains swampy, 

 and is now overgrown with a rank and varied vegetation. Running 

 through it is a little boggy stream, which has its rise about 100 yards 

 off. For years this has been a favourite locality of mine, for it lies within 

 half an hour's walk, and has given me at one time or another many a 

 good thing. Yet all the while the existence of this striking little insect 

 remained unsuspected, and it was not until August 8th, 1910, that at 

 last it made itself known. On that occasion I took three specimens. 



