21. 
23. 
24: 
25. 
26. 
DEJEANTIA. 
Cheeks very broad; eyes proportionately small; fourth vein 
not prolonged at its point of curvature Loe 
Cheeks narrow; eyes large; fourth vein prolonged at its 
point of curvature . 
. Eyes hairy ; scutellum and abdomen very densely beset with 
macrochete . . Soe ee ee ee . 
Eyes bare; scutellum and abdomen with normal macrochetze 
Proboscis very long and slender, its apical half turned back- 
ward; arista nicked re 
Proboscis of the usual form; arista not nicked . 
Abdomen elongate-conical or cylindrical; tarsi of the front 
legs notably longer than the tibie . . . 
Abdomen short-conical or ovate; tarsi shorter than the tibize 
Third antennal joint double as long as the second 
Third antennal joint more than double as long as the second. 
Lateral ridges of the face with a row of bristles; apical cell 
open Soe ee ee 
Lateral ridges of the face without bristles ; apical cell closed. 
DEJEANTA. 
Dejeania, Robineau-Desvoidy, Essai sur les Myodaires, p. 33 (1830). 
Baumhaueria, Meig. = 
Metopia, Meig. 
Lasiona, v. d. Wulp. 
23. 
Siphona, Meig. 
24, 
25. 
26. 
Myobia, Rob.-Desv. 
Hypostena, Meig. 
Degeeria, Meig. 
Clista, Meig. 
Dejeania and the following three genera (fHystricia, Saundersia, and Jurinia) agree 
in their general structure with Echinomyia; but differ in the very robust and spine-like 
macrochetz on the abdomen and scutellum, those on the latter being sometimes absent. 
Such spines are also to be found in the genus Belvosia; but this genus has not the 
Echinomyia-form, the head being broader and the third joint of the antenne more 
elongated. 
In the genus Dejeania the palpi are strongly developed, and extend horizontally 
forwards with the equally elongated proboscis. This and the further characters by 
which it is distinguished are clearly and rather amply indicated by Macquart (Dipt. 
Exot. ii. 38, p. 32). I have only to add that in all the species known to me the eyes 
are bare, the cheeks have a row of weak hairs between the facial ridges and the orbit 
of the eyes, and the legs (especially the tarsi) are long and slender; the front tarsi, 
however, in the female are a little enlarged ; the last joint of the tarsi in the male is 
surrounded by some long and curved bristles, and the claws and pulvilli in this sex are 
elongated. 
Six species are here enumerated from our region. 
N.B.—D. hystricosa, Williston (Trans. Am. Ent. Soc. xiii. p. 297), from New Mexico, 
Arizona, &c., doubtless inhabits Northern Mexico. 
