410 DIPTERA. 
1. Polionota mucida. (Tab. XII. fig. 1, wing.) 
Acrotoxa mucida, Gig].-Tos, Mem. R. Accad. Sci. di Torino, ser. 2, xlv. (sep.) p. 58, fig. 21’. 
Head, antenn, proboscis, palpi, legs, and halteres yellowish-rufous; thorax rufo-cinereous, with a short yellow 
pilosity ; scutellum black, with the hind-border broadly yellowish-white ; abdomen shining black. Wings 
fuscous, with the following hyaline portions: a complete transverse cross-band near the base; immediately 
beyond the stigma a trigonal costal spot, the tip of which includes the small cross-vein; three deep 
incisions at the end of the posterior margin, the exterior one extending to the first posterior cell; a 
smaller incision on the hind margin, under the discal cell; and a large oval dot in the proximal half of 
the discal cell and a dot upon the end of the sixth vein. 
Hab. Mexico}, Chilpancingo in Guerrero 4600 feet (H. H. Smith). 
A single male specimen of this species has been received from Guerrero. 
2. Polionota radians, sp.n. (Tab. XII. figg. 2, wing; 2a, abdomen, ? .) 
Very like the preceding species, but differing as follows: the thorax more obscure cinereous ; the wings without 
a hyaline cross-band near the base; the blackish stigma with a small clear dot; the antenne a little 
shorter; the oral margin less prominent; the inferior portion of the cheeks larger. The abdomen of the 
female is slender; the ovipositor very long, its basal segment flattened, shining black, the second 
lanceolate, rufous, appearing three-jointed. 
Hab. Mexico, Sierra de las Aguas Escondidas 9500 feet (H. H. Smith). 
One male and two females. 
\ 
? ACIURA. 
a 
Aciura, Robineau-Desvoidy, Essai sur les Myodaires, p. 773 (18380). 
1. Aciura insecta., (Tab. XII. fig. 3, wing.) 
Trypeta insecta, Léw, Monogr. Dipt. N. Amer. i. p. 72, t. 2. fig. 8°; iii. p. 268, t. 10. fig. 8%. 
Aciura insecta, Schiner, Dipt. Novara Reise, p. 265’. 
Hab. Mexico, Orizaba (H. H. Smith & F. D. Godman), Tierra Colorada in Guerrero, 
Atoyac and Medellin in Vera Cruz, Teapa and Frontera in Tabasco (H. H. Smith).— 
CoLomBIA?; Braziu; ANTILLES, Cuba! 2, Haiti. 
Several specimens of both sexes. The extension of the black coloration on the 
abdomen, as well as the pattern of the wings, is somewhat variable. Some examples 
seem to agree with the Brazilian A. phenicrura, Léw (1. ¢. ill. p. 269), but there are 
many transitions, and the essential differences between the two species are not quite 
clear in his descriptions. 
POLYMORPHOMYITIA. 
Polymorphomyia, Snow, Kansas University Quarterly, ii. p. 165 (1894). 
A single species from Mexico is referred to this genus. In the shape and pattern of 
the wings it approaches the N.-American P. basilica, Snow, the only Polymorphomyia 
hitherto described. 
