282 Transactiona . — Zoology. 



only as long as the head and thorax together, somewhat com- 

 pressed, 2+14 jointed ; joints of the scapus distinct, cyathi- 

 form, setose at the apex; flagellar joints cylindrical, with 

 downy puhescence. Thorax highly arched, oval. Scutellum 

 small, semicircular. Metathorax acclivous. Halteres with 

 an oblong club. Abdomen slender, with seven segments, 

 narrowed at the base, generally claviform, especially in the 

 male, somewhat flattened posteriorly; in the male terminating 

 in a short forceps, in the female in a short non-projecting 

 ovipositor with two terminal lamellae. Legs long ; femora 

 with a fringe of hair on the lower side ; tibiae spurred, the fore 

 pair with two, the hind pair with three ranges of lateral 

 spines, of which those on the inner side are particularly short 

 and delicate ; coxae elongated, the fore pair hairy on the front, 

 the intermediate pair only at their apex, the hind pair with a 

 row of setaceous hairs on their outer sides. In the male of 

 some species the coxae of the intermediate legs have on the 

 inner side a long arcuated spine ; these spines terminate in a 

 double hook-shaped curved point, usually of a dark colour. 

 Wings microscopically pubescent, longish-oval, with rounded- 

 off base, a little longer than the abdomen. Tip of the costal 

 vein uniting with the tip of the second longitudinal vein at 

 the apex of the wing, rarely before it ; auxiliary vein termi- 

 nating in the costa not beyond the anterior branch of the 

 second longitudinal vein ; base of the second posterior cell 

 l\ing either before, under, or beyond the origin of the third 

 longitudinal vein, but alwavs before the base of the third sub- 

 marginal cell, and never so far forward as to come under the 

 anterior branch of the second longitudinal vein ; fifth longi- 

 tudinal vein incomplete, usually broken off opposite the 

 middle of the second posterior cell, sometimes disappearing 

 before the base of the second posterior cell. 



Sciophila fagi, sp. nov. Plate X., fig. 1. 



Size of body, 0-174 x 032; expanse of wing, 0-132 x 

 0-074. 



Joints of scapus short, not more than half their length, 

 light-yellow, with a few black hairs; first joint of flagellum 

 yellow but clouded, subsequent joints black, length about four 

 tunes their breadth, covered with very fine glistening black 

 hairs. Palpi long and slender, clouded straw-colour; first joint 

 short, slightly hairy ; second joint about twice the length of 

 first, scattered black hairs on its surface ; third joint more 

 slender and twice the length of the second ; fourth joint still 

 more slender and darker in colour, about half as long again 

 as the third. Vertex almost black. Thorax yellow, marked 

 with tawny ; two lateriil rows of black hairs inclined to 

 one another and meeting before the scutellum, also a median 



