Dolichopodidae. 27 



pruinosity 'especially dense in front, the posterior part and scu- 

 tellum less pruinose, slightly shining; there are generally three less 

 pruinose and tlius more green stripes. The acrostichal hairs are 

 small and yellow anteriorly, longer behind; the bristles black ; there 



Fig. 4. Antenna of S. platijpterus. X (Jo. 



are two supraalar bristles. Scutellum with two black bristles and on 

 each side a smaller hair. Pleura grey or slightly greenish grey, a 

 little pale just below the hmiieri and above the middle coxæ, and 

 the part of the hypopleura above the hind coxæ (metaepimera) yel- 

 low. Abdomen metallic green, less pruinose than thorax and thus a 

 little more shining; the incisures form brown, transverse bands, the 

 brown colour lying mainly at the anterior margin of the segments. 

 Abdomen is clothed with hairs, which are mainly black above, yel- 

 lowish at the sides and above anteriorly; at the hind margin of the 

 segments there are long, black, bristly hairs, which are strongest on 

 the two last segments; on the first segment they are yellow and very 

 long. Venter yellow or brownish yellow, palest towards the base, 

 with yellow hairs. Hypopygium of moderate size, somewhat rect- 

 angular in contour, black; the anterior part is metallic shining, the 

 posterior part fmely, longitudinally striated; the eighth segment is 

 somewhat pruinose, pale-haired at the upper part; the hypopygium 

 is rather deeply incised on the dorsal side, so that the outer lamellæ 

 issue somewhat dorsally; these latter are small, narrow and curved 

 downwards or outwards at the apex; they are brown and brownish 

 hairy at the margin; the inner lamellæ are almost quite hidden. The 

 sheath of the penis reaches to the end of the hypopygium. Legs 

 yellow, front coxæ and femora whitish; the hind femora may be very 

 slightly darkened at the tip above, hind tibiæ likewise very slightly 

 darkened in the middle, and hind tarsi towards the tip, the last joint 

 black. The front metatarsus is shorter than the four following joints; 

 the middle tarsi have the third and fourth joints somewhat com- 

 pressed, snow-white. the fourth black at the apex and the fifth joint 

 black; the metatarsus is longer than the other four joints; the hind 

 metatarsus as long as the four following joints. The front coxæ have 

 longish, white hairs and a row of bristles on the anterior side; the 

 posterior coxæ whitish hairs on the outer side, and each with a 

 stronger bristle; for the rest the legs have short, black or brownish 

 black hairs, only the front femora have yellow hairs beneath, which 



