216 DOLICHOPID^. 



segment. Ungues of the fore tarsi whitish, slightly lengthened. Feyn. 

 Hypostoma as broad as the front, short, hoary, with a transverse 

 suture in the middle. Palpi black, with ferruginous tips, larger than 

 in the male. Ungues short. 



Rare. (E. I.) 



2. obscurellus, Ztt. i. 1. 706. 2. d. s. 492. 2 (1843). Nigro- 

 ceneiis, antennis hypodomate lialteribus pedibusque nigris, alls hyalinis ad 

 costam subfumatis. Long. 1—1^; alar. 2|— 3 lin. 



Black, dull. Thorax in certain aspects loitli a slight brassy hue, especially 

 on the hinder part, slaty-black beneath. Wings smoky-brown towards 

 the costa. Halteres black. Legs brownish-black. Male. Abdominal 

 appendages very short. Ungues of the fore tarsi a little longer than 

 the others. 



Rare. In Mr. Haliday's collection. (E. I.) 



Genus XIII. CHRYSOTUS. 



Chkysotus, Mg. zw. iv. 40 (1824); Mq.; Ztt. Dolichopiis ^.,Yh. 

 s. a. ; Wd. ; Fin. Musca p., Fb. 



AntenncB articulo tertio patellceformif arista apicali. Oculi fronte dis- 

 tantes, infra antennas contigul in mare. ■ Alee dlvaricatcB, vena trans- 

 versa a marg'me distante. Hypopygium maris subimmersum, subtus 

 appendicibus binis oblongis dejiexls. Tibice sphmlosce. 

 Antennce short, the first three joints nearly of equal length, the first 

 naked, the third joint broader than long, rounded, with the arista at the 

 tip. Eyes almost glabrous, distant on the front, meeting below the an- 

 tennae in the male, divided by a rather narrow face in the female. Proboscis 

 short and obtuse. Wings divaricated in repose, the discal transverse 

 vein very distant from the hind margin, lying usually rather nearer the 

 base than the tip of the wing, the long suljapical vein nearly straight 

 and parallel with the cubital. Abdomen rather conical ; in the male 

 compressed behind, with the sixth segment exserted ; the small hypo- 

 pygium. partly imbedded xlvAqx the tip of it, armed behiad with some 

 very short spines, and beneath with a pair of oblong deflected appendages. 

 Tibia, at least the posterior ones, armed tvith some spines. 



The species of this genus are among the smallest of the family ; 

 the body is usually of an uniform bright metallic hue. They 

 chiefly frequent the leaves of trees, in the sunshine, and are 

 active and restless. The few species at the end, wliicli have the 

 bristles of the thorax yellowish and the abdomen at least partly 

 yellow, seem to compose a distinct group, but from their extreme 

 tenderness they shrivel up so much when dried, that it is difficult 

 to make out the characters. 



