I30 AN ACCOUNT OF BRITISFT FLIES. 



times in a straight line. Abdomen cylindrical, with large anal 

 segment and small hypopygium, short ovipositor, and two strong 

 lamellae. Legs long, stout, and strong. Wings longish and rounded. 

 The costa passes beyond the apex of the third longitudinal. The 

 upper and lower branch of the first longitudinal form together one 

 transverse veinlet. The fourth longitudinal vein is forked, and the 

 fork has a short petiole ; sixth longitudinal vein very short. The 

 larvae live in fungi and rotten wood. 



A. defecfa, Wlk. 



The perfect insect is black. Testaceous palpi. Antenna i6- 

 jointed, sub-moniliform, a little longer than thorax. Abdomen 

 testaceous at the tip. Wings nearly limpid, first longitudinal vein 

 joining costa before one-third length of wing, united by a little trans- 

 verse veinlet with the second longitudinal vein, at some distance 

 from its tip ; the second is united to the third by a veinlet, which is 

 a little beyond the base of the fourth vein ; third joining the costal 

 near the tip of the latter ; fourth and fifth slight, the former forked 

 near its base. Legs testaceous ; trochanters partly black ; spurs 

 long ; tarsi blackish, minutely setose beneath. Length, i lin. 



This species seems only to be described by Walker, from whom 

 this account is compiled. 



A. nitidicollis, Mg. 



Black with shiny hairs, thorax shiny ; hypopygium and lamella; of 

 ovipositor yellowish; antennae i6-jointed, brown; palpi yellowish. 

 Legs testaceous ; tarsi brown ; base of legs brown. Wings brownish ; 

 base and veins brown. Length, i\ lin. 



A. aincena, Wtz. 



This is a yellowish species also found in England. Length, 2 lin. 



Genus. — Glaphyroptera, Wtz. 



Most of the species in this genus seem to have been placed in the 

 old genus Leia, and many of them are described under this head by 

 Walker and Meigen. Head roundish, flat above ; proboscis short ; 

 palpi 4-jointed ; fourth joint very long — as long as the three 

 preceding ones together. Antennse i6-jointed. Eyes oval ; ocelli 

 three, in a semicircle ; central one small ; lateral ones large near the 

 eyes. Thorax very convex. Abdomen with seven segments, slender, 

 short anal segment and small genitalia ( (^ ). Legs fairly thick ; 

 tibise with long spines. Wings generally with spots or bands. Fourth 

 and fifth veins forked. 



