416 
DIPTERA. 
BARYPLEGMA, gen. nov.* 
Front posteriorly broader than the eyes, narrowed towards the base of the antenne; face short, excavated 
oral margin slightly prominent; cheeks rather narrow. Antenne inserted on the median line of the 
eyes; second joint somewhat prominent; third joint elliptic, reaching to beyond the middle of the face; 
arista bare. Scutellum with four bristles. Ovipositor of the female conical, flattened, as long as the 
three preceding segments of the abdomen united. Front femora with a row of bristles on the underside ; 
hind tibie fringed with hairs on the outer side. Wings longer than the abdomen, with a yellow pattern, 
interrupted by several marginal incisions and some rather large hyaline dots on the disc; third and 
fourth veins straight and parallel; small cross-vein distinctly beyond the middle of the discal cell. 
The single species from which these characters are taken differs from all the 
described Trypetids in the coloration of the wings; it seems, therefore, to require a 
separate genus for its reception. 
1. Baryplegma gilva, sp.n.,¢. (Tab. XII. fig. 14, wing.) 
Head rufous; frontal bristles yellow. Thorax, scutellum, metanotum, and abdomen cinereous, ochraceo- 
pollinose ; the bristles of the thorax and scutellum yellow; hind-borders of the abdominal segments 
fringed with yellow hairs; ovipositor shining, brownish-red. Legs pale rufous; the bristles on the 
underside of the front femora and the hairs on the hind tibie black. Halteres rufous. Wings 
ochraceous, with the base hyaline ; stigma with a fuscous streak near the auxiliary vein; on the costa 
two hyaline spots before the stigma and two beyond it; round the tip and along the posterior margin 
several incisions of different sizes; three hyaline dots in the cubital cell, one in the first basal cell, and 
three in the first posterior cell; two hyaline spots in the discal cell; some of the incisions and dots more 
or less margined with fuscous; posterior cross-vein slightly undulate and narrowly bordered with brown. 
Hab. Mexico, Santiago Iscuintla in Jalisco (Schumann). 
A single female specimen. 
ENSINA. 
Ensina, Robineau-Desvoidy, Essai sur les Myodaires, p. 751 (1830). 
1. Small cross-vein not enclosed in the fuscous pattern of the wings . . . 2. 
Small cross-vein enclosed in the fuscous pattern of the wings. . . . . 8. 
2. Stigma black, without a hyaline dot . . . . . . .. . . . . . humilis, Liw. 
Stigma black, with ahyaline dot . . . . 2... 7...) peregrina, Low. 
3. The fuscous border of the small cross-vein separated from that of the 
posterior cross-vein . . woe toe. oe . . luculenta, v. d. W. 
The fuscous border of the small cross-vein connected with that of the 
posterior cross-vein. . . . woe ew ew ew A 
4, No hyaline spot in the first posterior cell above the posterior cross-vein . conspersa, v.d. W. 
A hyaline spot in the first posterior cell above the posterior cross-vein. . 5. 
5. Femora blackish . . 2. 2. 2 1. 2. 1 ew 1 1 ew... despecta, v. a. W. 
Femorarufous . . . . eee ee soe ee ew we 6, 
6. On the costa, between the stigma and the end of the second vein, two 
hyaline incisions . . . . . mediana, v. d. W. 
On the costa, between the stigma and the end of the second vein, three 
hyaline incisions. . . . 1 we ee ee ww we. guttularis, v. dW. 
* Gaps, coarse ;rhéypa, network. 
