394 | DIPTERA. 
clearer, and the second and following joints of the hind tarsi are 
dilated). 2. 2. 6. 1 1 ee ee ee ee ee 
End of the second vein with a black spot; cubital cell with three black 
spots beyond the eye-like spot; the fuscous portion of the wings not 
spotted, but reticulated (in the male the costa is enlarged at the middle). cosfalis, v. d. W. 
tarsata, Schin. 
1. Pterocalla fenestrata, sp.n.¢ 92. (Tab. X. fig. 30, wing.) 
Brownish-cinereous, black-punctured; antenne and legs rufous; wings fuscous, the apical portion yellowish, 
with three hyaline eye-like spots; a row of hyaline spots in the first basal cell. 
Length 4-5 millim. 
Head yellowish-cinereous ; front short-haired, as broad as the eyes, slightly attenuated towards the points of 
insertion of the antenne, with three brown dots on each side; bristles on the vertex only; the orbits 
of the eyes whitish. Antenne brownish-rufous; third joint longer than the basal joints, reaching to a 
little beneath the middle of the face; arista microscopically pubescent. Proboscis brown; palpi black. 
Thorax, scutellum, and abdomen dark cinereous, black-punctured, the punctuation on the thorax here and 
there becoming closer and forming small spots, and on the abdomen more regular spots on the front 
borders of the segments; ovipositor shining black, terminating in a fine point. Legs yellowish-rufous, 
the femora more brownish. Halteres yellow. Wings with more than their basal half fuscous, the 
remaining portion yellowish, the fuscous coloration not covering the subhyaline basal part of the hind 
margin; on the costa are two hyaline spots—one, punctiform, at the end of the auxiliary vein, the other, 
larger and somewhat trigonal, at the end of the first vein; in the yellow portion are three rounded hyaline 
eye-like spots, these having a brown outline—one in the cubital cell and two in the first posterior cell; in 
the first basal cell is a row of rounded hyaline spots; the small cross-vein with a narrow hyaline border ; 
at the end of the second and third veins there are some small brown spots: the external eye-like spot in 
the first posterior cell is connected by a brown, oblique stripe with the end of the fourth vein; second 
vein undulate towards its end; fourth vein slightly curved. 
Hab. Mexico, Atoyac in Vera Cruz and Teapa in Tabasco (H. H. Smith). 
Two males and two females. 
2. Pterocalla quadrata, sp.n. ¢. (Tab. XI. fig. 1, wing.) 
Cinereous, black-spotted and punctured ; antenne and legs rufous; wings fuscous, with many black stripes 
and spots, the hind margin, two small costal dots, and four eye-like spots quadrangularly arranged near 
the tip, hyaline. 
Length 4 millim. 
Front short-haired, a little broader than the eyes, slightly narrower towards the points of insertion of the 
antenne, cinereous, with some black dots in two transverse rows; on the vertex some weak bristles ; 
face whitish-grey. Antenne brownish-rufous; third joint short-ovate, nearly rounded; arista micro- 
scopically pubescent. Proboscis brown; palpi rufous. Thorax and scutellum cinereous, with blackish 
points and dots, the latter forming a row along the sides and round the scutellum, and stripes on the 
pleurze; abdomen also cinereous, black-punctured, with a row of black spots on the front borders of the 
segments ; ovipositor shining black, terminating in a point. Legs yellowish-rufous ; the fore and middle 
femora brownish ; the hind femora brown at the base, and with a brown spot on the outer side before 
the tip. Halteres yellowish. Wings fuscous, with the hind margin hyaline, the hyaline border undulate 
and several times incised; the fuscous portion with many black spots, these being somewhat irregular 
along the costa—in the cubital cell they form a row of small dots and in the first basal cell a row of 
transverse stripes (in the discal cell they are wanting); there are two small hyaline dots on the costa, 
at the termination of the auxiliary and first veins; near the tip of the wing are four eye-like spots in 
an oblique quadrangle—one in the cubital cell and three in the first posterior cell; the small cross-vein 
