480 SUPPLEMENT. 
2. Gymnocheta subviridis. 
Gymnocheta subviridis, v. d. Wulp, Tijdschr. voor Ent. xxxv. p. 194°. 
Thorax and scutellum metallic green, with grey tomentum; abdomen violet; head whitish; antenne and legs 
black ; palpi rufous. 
Length 9 millim. 
Resembles G. reinwardti, 9 , but differs in the much less metallic coloration, the thoracic dorsum and the 
scutellum only having a metallic-green ground-colour, which, however, for the most part is covered by a 
grey tomentum ; the abdomen is neither green nor steel-blue, but dark violet. The front is grey, without 
any conspicuous metallic ground-colour ; the face and cheeks are whitish ; the eyes clothed with a dense 
yellowish-grey pile. Antennz wholly black; third joint twice as long as the second; arista thickened 
to a little beyond the middle; palpi rufous, curved upwards and slightly thickened towards the tip. The 
macrocheete of the abdomen are long. The legs are very bristly, especially on the outer side of the middle 
tibia, where the bristles are long. The curvature of the fourth vein forms a right angle (in G. retnwardti 
it has an acute angle); the posterior cross-vein is nearly straight. 
Hab. Mexico ! (coll. Bellardi). 
A single female specimen. 
8. Gymnocheta alcedo. 
Gymnocheta alcedo, Liéw, Dipt. Amer. Sept., Cent. viii. no. 61°. 
Hab. Norra America!.—Mexico, Atoyac in Vera Cruz (Schumann), Teapa in Tabasco 
(H. H. Smith). 
Two females, agreeing with Léw’s description, which gives the third antennal joint 
as elongate (nearly twice as long as the second). In one of our specimens the antenne 
are not entirely black, but partly rufous. 
DISTICHONA (p. 44). 
Distichona varia (p. 44). 
In the four additional specimens (two of each sex) received from Omilteme, Mexico, 
the apical cell of the wings is closed, and the hind tibiz are more or less rufous. 
CNEPHALIA (p. 45). 
Brauer and von Bergenstamm (Denkschr. Akad. Wissensch. Wien, lvi. p. 100, and 
Ivili. p. 8353) have divided their group “ Goniide” into two sections—one with the 
arista three-jointed, and the other with it two-jointed. In the first section they include 
Gonia, Meig., and Pseudogonia, Br. & v. B. (Gonia cinerascens, Rond.); in the second 
Onychogonia, Br. & v. B., Spallanzania, Rond., and Cnephalia, Rond., the three latter 
genera differing only in the relative length of the antennal joints and in that of the 
joints of the arista. ‘These last-mentioned characters, however, seem to me to be 
insufficient for generic separation. I therefore prefer to include, at least for the 
present, all the forms with a two-jointed arista in the one genus, Cnephalia. 
