344 SUPPLEMENT. 



SYMPYCNUS. 



Sympycnus, Loew, Neue Beitr. v. p. 42 (1857) . 



1. Sympycnus angustipennis, sp. n. (Tab. VI. fig. 20, wing of <? .) 



c? . Face extremely narrow below, white-dusted ; front purple in the middle. Antennae brownish-yellow, rather 

 elongate, slender ; the third joint rounded, with almost basal arista. Cilia of inferior orbit white. Dorsum 

 of thorax bluish-green, not distinctly marked with lines, but with scattered whitish dust. Scutellum of 

 the same colour. Pleura? bluish-green, with grey dust, the hind margin, a humeral spot, and a few faint 

 traces elsewhere, yellow. Halteres and tegulse yellow, the latter with yellowish cilia. Abdomen dark 

 bronze, the venter and the sides near the base yellow ; hypopygium protruding moderately behind, with a 

 distinct pair of pale yellow appendages. Legs, including the coxae, yellow ; the middle and hind coxae each 

 with a blackish bristle on the outer side ; tarsi but little infuscated. Pulvilli not enlarged. Middle 

 metatarsus as long as all the following joints. Wings subhyaline, so narrow that the outline behind is 

 almost symmetrical with that in front ; fourth vein ending at the apex. 

 $ • Pace quite wide ; the purple front very conspicuous ; wings considerably wider behind near the base. 

 Length 2*1 millim. 



Hab. Mexico, Orizaba (H. H. Smith). 

 One male and one female. 



2. Sympycnus varipes, sp. n. 



5 . Face slender, narrower below, covered with brownish dust ; front of the same colour, not shining. Antennse 



black, short ; third joint hairy, pointed, the arista arising near the base. Cilia of the inferior orbit white. 

 Dorsum of thorax opaque grey, with the bristles arising from brown spots and with a brown line down the 

 middle, where there is a scattered row of large acrostichal bristles. Scutellum bright blue above, somewhat 

 dusted around the margin. Pleurae opaque, grey, greenish below. Halteres and tegulae yellow ; cilia of 

 the latter of a rather neutral brownish colour. Abdomen bronze-green, the anterior part of each segment 

 purplish-bronze above ; hypopygium rounded, projecting behind, but not showing any appendages in the 

 only specimen seen. Pore legs, including the coxae, yellow : the last tarsal joint black ; this joint is enlarged, 

 and the pulvilli also. Middle coxae black, except at the tip, with white hairs in front ; middle legs 

 otherwise yellow, except the last joint of the tarsi, which is black, and the tips of the remaining tarsal 

 joints, which are slightly infuscated. Hind coxae black, except at the tip, with one long blackish bristle 

 on the outer side ; hind femora faintly infuscated above near the tip ; extreme tip of the hind tibiae and the 

 whole of the hind tarsi infuscated ; first and second joints of hind tarsus of nearly equal length. Wings 

 subhyaline, moderately narrowed at the base ; fourth vein ending at the tip. 

 Length 2*6 millim. 



Hab. Mexico, Omilteme in Guerrero (H. II. Smith). 

 One male. 



3. Sympycnus COXalis, sp. n. (Tab. VI. fig. 21, profile, 6 .) 



6 . Pace and front black, thinly dusted with grey. Antennae yellow (the third joint missing in the type), with- 



out any infuscation, short. Palpi brown. (Cilia of the inferior orbit entirely concealed in the described 

 specimen by the collapsing of the head.) Thorax and abdomen greyish-green, not very shining ; pleura 

 similarly coloured ; the hairs on the abdomen, especially near the tip, brown. Hypopygium thick, very 

 unsymmetrical, of a brown colour, closely applied to the abdomen, so that no appendages protrude. 

 There is a distinct notch in the ventral outline where the hypopygium begins, which is preceded by some 

 long brown hairs. The first two segments of the venter, as well as the hind margin of the pleura and a 

 humeral spot, are brown. Legs yellow, the base of the middle tibiae infuscated. Fore coxae wholly 

 yellow, with three or four extremely long blackish bristles, not all being at the tip ; fore tarsi not 



