PTEROCALLA. 399 
with a narrow hyaline border; second vein slightly undulate near its end; fourth vein undulate beyond 
the small cross-vein. 
Hab. Mexico, Teapa in Tabasco (H. H. Smith). 
A single female specimen. 
8. Pterocalla ocellata. (Tab. XI. fig. 2, wing.) 
Dictya ocellata, Fabr. Syst. Antl. p. 330°. 
Trypeta ocellata, Wiedem. Aussereur, zweifl. Ins, ii. p. 495°. 
Platystoma ocellata, Macq. Dipt. Exot., Supp. 1, p. 206, t. 18. fig. 4°. 
Pterocalla ocellata, Rond. Studi Entom. pp. 86, 102 (1848)‘; Schiner, Dipt. Novara Reise, p. 286 *s 
Gigl.-Tos, Mem. R. Accad. Sci. di Torino, ser. 2, xlv. (sep.) p. 40°. 
This species, which may be regarded as the type of the genus, is of somewhat larger size than the two 
preceding (Wiedemann gives 23 lines, the Mexican specimen before me is 6 millim. in length). The 
yellowish-grey front has no black dots, but two indistinct rufous stripes; the antenne are brownish- 
rufous, the third joint oval, darker towards the tip; the arista is microscopical pubescent. The thoracic 
dorsum is not punctured, yellowish-grey, with two indistinct brownish stripes; on the sides of the 
thorax and round the scutellum are small black dots, each emitting a bristle; pleura with blackish 
stripes. The fuscous coloration of the wings does not reach the hind margin, its outline there being 
several times incised; in the whole central part, and also in the discal cell, are numerous black transverse 
stripes, but they are wanting in the large mediastinal cell; near the tip of the wing are three eye-like 
spots—one in the cubital cell and two in the first posterior cell, the latter placed close under the third 
vein; the second vein near its end and the fourth vein beyond the small cross-vein are distinctly 
undulate. 
Hab. Mexico ®, Atoyac in Vera Cruz (H. H. Smith).—Sovuta America 12°, Colombia °, 
Brazil ¢. 
A male of this species has been received from Atoyac. 
4. Pterocalla tarsata. (Tab. XI. figg. 38, wing, ¢; 4, wing, 2 .) 
Pterocalla tarsata, Schiner, Dipt. Novara Reise, p. 287'; Gigl.-Tos, Mem. R. Accad. Sci. di 
Torino, ser. 2, xlv. (sep.) p. 40°. 
This species is easily recognizable by the peculiar form of the hind tarsi in the male. Giglio-Tos remarks that 
the four dilated joints, as well as the terminal one, are silvery. The broad clearer central streak in the 
wings of the male is absent or scarcely indicated in the female. The thorax and abdomen are black- 
punctured; on the hind border of the thorax is a row of black dots, and there is a similar row of dots on 
the front borders of the abdominal segments; the first joint of the ovipositor of the female is broad, 
cinereous, and black-punctured, the second and third joints being shining black, cylindrical, and very 
thin. Halteres yellowish. ‘The black spots and stripes in the fuscous portion of the wings are arranged 
in rather regular rows, and they extend over the discal and first posterior cells; the three eye-like spots 
are placed triangularly—two of them in the first posterior cell in an oblique direction to each other, the 
internal one just above the fourth vein, the outer one close under the third vein; the mediastinal cell is, 
especially in the male, very large, and reaches far beyond the small cross-vein ; the second vein towards 
its end and the fourth vein beyond the small cross-vein are undulate. 
Hab. Mexico ?, Teapa in Tabasco (H. H. Smith) —Soutu America }. 
Several specimens of both sexes. 
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