396 
Cinereous, black-punctured; front, antenne, and legs rufous; 
DIPTERA. 
5. Pterocalla costalis, sp.n.,¢ 9. (Tab. XI. figg. 5, wing, ¢; 6, wing, 2.) 
wings fuscous, reticulated, with the hind 
margin, two or three small costal dots, and three eye-like spots near the tip, hyaline, the costa enlarged 
in the middle in the male. 
Length 5 millim. 
Front short-haired, dark rufous, as broad as the eyes, enlarged towards the vertex, with some brown dots ; 
face yellowish-grey ; orbits of the eyes whitish. Antenne brownish-rufous; third joint oval; arista 
microscopically pubescent. Proboscis and palpi brown. Thorax, scutellum, and abdomen brownish- 
cinereous, black-punctured and spotted, nearly in the same manner as in P. guadrata. Legs yellowish- 
rufous; femora with two brown spots on the outer side; tibie with two brown rings. Halteres yellowish. 
Wings fuscous, the hind margin subhyaline; the outline of the dark coloration undulate and incised in 
several places; a black double spot at the end of the second vein and some other spots near the tip of 
the wing; the rest of the fuscous portion not black-spotted and striped, as in P. ocellata and other 
species, but reticulated, and with many less obscure dots, which are mostly rounded and in regular rows 
between the veins; there are two or three hyaline dots on the costa and three eye-like spots near the tip, 
these latter arranged as in P. ocellata. In the male the middle of the costa is enlarged, the mediastinal 
cell thus becoming very broad, though not reaching beyond the small cross-vein ; the second vein towards 
its end and the fourth vein beyond the small cross-vein are distinctly undulate. 
One male and one female. 
EUXESTA. 
Euzesta, Low, Berl. ent. Zeitschr. xi. p. 297 (1867). 
two only of which appear to have been described :-— 
1. 
a 
. Abdomen reddish-brown, with the sides only metallic: 
Face not metallic 2. 2... we ee 
Face metallic (wings with four more or less complete cross-bands) 
. Wings with only two costal spots; legs rufous; head much broader 
than high . . . soe . toe 
Wings with four cross-bands, the first, second, and fourth abbreviate ; ; 
legs blackish; head of usual shape, not broader than high . . . . 
Second and third cross-bands much enlarged towards the posterior 
margin . . . . Lo 
Second and third cross-bands + not or but little enlarged towards the 
posterior margin. . . - 
Legs rufous ; the fourth cross-band on ‘the tip of the wing br oader than 
the hyaline space between the third and fourth cross-bands . 
Legs black ; the fourth cross-band on the tip of the wing narrower than 
the space between the third and fourth cross-bands . . ... . 
. The third and fourth cross-bands separated, or at most united by a 
very narrow infuscation at the costal vein . 
The-third and fourth cross-bands connected at the costa . . 
larger species 
(length 75 millim.). 2. 2... 1 1 we ee ees 
Abdomen metallic blackish-green : smaller species (length 4 millim.) . 
. Head with a velvety-black spot between the antenne . . . 
Head without a black spot between the antenne . . . ... . 
Hab. Mexico, Chilpancingo and Amula, both in Guerrero (H. H. Smith). 
Hight species of this genus are represented in the Mexican collections before me, 
2. 
3. 
laticeps, v. d. W. 
nigricans, v. d. W. 
4. 
latifasciata, v. d. W. 
fascipennis, v. d. W. 
6. 
7. 
major, v.d. W. 
alternans, Low. 
stigmatias, Low. 
conserta, v. d. W. 
