Dolichopodidae. 



31 



ocular hairs white, the uppermost very short, black; the lower part 

 of occiput covered with white hairs, Antennæ yellow, the third joint 

 and the arista brown or blackish brown. Thorax metaliic green, 

 somewhat densely greyish or brownish pruinose, dull; it is most 

 densely pruinose anteriorly, and indistinctly striped. Scutellum less 

 pruinose. The acrostichal hairs are stronger than in platypterus^ black 

 like the other bristles; there are three supraalar bristles, the hind- 

 most longest. Scutellum with two black bristles, and on each side a 

 small hair. Pleura grey, metaepimera yellowish. Abdomen metaliic 

 green, slightly pruinose, the incisures forniing brown transverse bands, 

 lying mainly at the anterior margin of the segments. Abdomen 

 clothed with short, black hairs, at the sides anteriorly they are longer 

 and yellow; at the hind margin of the segments are black bristles, 

 they are long on the first segment, and also here black. Venter 

 yellow, with yellow hairs; the 

 yellow colour may stretch in 

 on the side margins of the 

 first segments. Jrlypopygium 

 somewhat small, and quite 

 different from that in platyp- 

 terus: the eighth segment grey, 

 sparingly covered with pale 

 hairs; the hypopygium has 

 somewhat triangular, yellow 

 middle ventral lobes, and long, 

 styliform posterior ventral lobes ; these latter are curved towards each 

 other, they are yellow with black apex; at the base of each a long, 

 thin hair is seen. The outer lamellæ are united to a small, yellow 

 median lobe, with long, black hairs at the apex, and pale hairs above. 

 Below the said lobe lies a vertically placed, somewhat rhomboidal, 

 yellow piece, which bears two haired styliform processes at the apical 

 corner, and two brushes of curved hairs at the ventral corner ; I have 

 not been able to decide, whether the rhomboidal piece is paired or 

 single, but 1 think the whole answers to the inner lamellæ.^ The 

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

 the front coxæ whitish, the four last tarsal joints on the posterior 



Fig. 6. Hypopygium of S. Wiedemanni. 



1 I think the above interpretation of the parts of Ihis curious hypopygium is 

 coirect. as the piaces, from which the parts issue, seem to me to allow no 

 other interpretation; moreover the structure is then in accordance with the 

 figure of the hypopygium of S. {Gnamptopsilopus) filipes given by Snodgrass 

 (PI. XXXIII, figs. 4—6) in the work cited in the introduction, but this species 

 seems to have no inner lamellæ. 



