208 [Pebniary, 



I^.Jlavescens, L., the knobs of the halteres are dark brown above, the 

 tarsi, especially the hindmost, whitish-yellow, and the male genitalia 

 with yellow hooks only a little tinged with brown. It was not at all 

 uncommon last June near Tunbridge "Wells, but I unfortunately did 

 not then suspect its being distinct from E.flavescens, L. Loew de- 

 scribed it in 1871 from Silesia, and had seen one specimen from St. 

 Petersburgh. 



E.Jlavescens, L., is also all yellowish, but the palpi are darkened 

 yellowish, never approaching black, the abdomen is shorter and thicker, 

 and the hooks on the male genitalia black or blackened at their ends ; 

 I have taken it from Lymington to Inveran. 



E. lutea, Mg., I do not clearly know, it is smaller and darker 

 than E.flavescens, and with greyer wings ; I believe I possess it, but 

 my specimens are in very bad condition. 



E. tcenionofa, Mg., is a very common and widely spread species, 

 but as no continental writer seems to clearly recognise it, I append 

 the following notes. It is smaller than E.flavescens, the middle of 

 the thorax is brown, often almost blackish, forming a continuous line 

 up to the very base of the antennas ; if this middle line becomes very 

 dark or broad, indistinct side lines begin to appear, and in one male I 

 possess the w^hole central disc of the thorax might be described as 

 blackish, leaving the sides ochreous and the pleurae yellow (in this 

 specimen the upper-side of the abdomen is also all brownish) ; the 

 colJare is whitish ; the antennae all dirty-yellowish, if bent back not 

 quite reaching the scutellum, the joints elongate, bearing on one side 

 a hair considerably longer than the joint itself ; frons ochreous, dusky 

 on the middle ; knob of halteres blackish. The two forks on the wing 

 nearly equal, or the lower one a little the shorter, the last vein very 

 much twisted. The male genitalia yellow, the lamellae long and rather 

 narrow", intercrossing at ends with blackish toothed hooks. I have 

 met with it from Bickleigh Yale to Inchnadamph, the specimens from 

 Inchnadamph being very dark on the thorax and the three lines 

 coalescing ; it is abundant about a sort of sewage drain in a paddock 

 near my house, and specimens wei'e brought me once which were 

 literally crowded together by hundreds on the under-side of a stone 

 opening into a sewer. 



Beyond these four there is certainly another British species with 

 a curiously forked end to the hooks on the male genitalia, but I have 

 never yet found it in abundance, and have failed to identify it with 

 any described species. 



