332 DIPTERA. 
Hab. Costa Rica, Rio Sucio (Rogers).—Souru America, Argentina ’—Maperra ° ; 
S. Paut 1.6; Nicopar Is.6¢; Europe !~°. 
A single male specimen from Costa Rica, perfectly agreeing with our common 
European specimens. 
2. Homalomyia mexicana. 
Homalomyia mexicana, Bigot, Ann. Soc. Ent. Fr. 1885, p. 285 1; Gigl.-Tos, Mem. R. Accad. 
Scienze di Torino, ser. 2, xlv. (sep.) p. 27°. 
Hab. Mzxico12, Amula in Guerrero 6000 feet (H. H. Smith); Costa Rica, Caché 
(Rogers). 
Two male specimens. | 
They agree perfectly with Bigot’s description, except that the rufous colour of the 
knees and tibie is less conspicuous. This species is closely allied to H. canicularis, 
but may easily be distinguished from it by the narrower front (the eyes being nearly 
contiguous) and by the neuration of the wings. In H. mexicana the penultimate 
section of the fourth vein is much shorter than the terminal section (2:5), and also 
shorter than the posterior cross-vein; this latter is straight. 
HYDROPHORIA. 
Hydrophoria, Robineau-Desvoidy, Essai sur les Myodaires, p. 503 (1830). 
The principal characters of this genus are :—Kyes bare, in the male contiguous or 
subcontiguous ; arista plumose ; abdomen of the male elongate, the first segment longer 
than the following, and often appearing divided into two segments ; lower scale of the 
tegule extending beyond the upper; third and fourth veins parallel or slightly 
divergent towards the end; anal vein long, more or less distinctly reaching the border 
of the wing; axillary vein not curved towards the anal vein. 
I have distinguished the following species, all of which are described as new :— 
1. Legs black or piceous «ee ee ee ee es plumosa. 
Legs rufous or partly rufous © 6 6 ee ee ee ee es 2. 
9. Basal half of the antenne rufous. . «© 2) 6 ee ee et es collaris. 
Antenne wholly black 2. 6. 6. 6 6 8 8 ee eh ee ee 3. 
3. Palpi yellowish ; abdomen yellowish, with brown dorsal spots or dorsal line. flavipalpis. 
Palpi black ; abdomen grey, with dorsal stripe and transverse bands black . transversalis. 
1. Hydrophoria plumosa, sp. o., ¢. 
Cinereous ; three thoracic stripes, a dorsal stripe and transverse bands on the abdomen, antenne, palpi, and 
legs, black. 
Length 4°5 millim. 
Front triangular; eyes contiguous; face and cheeks whitish, the face shorter than the front ; inferior part of 
the cheeks narrow, with a row of bristles. Antenne black, inserted on the median line of the eyes ; 
