316 DIPTERA. 
pairs also with a few bristles; foot-claws and pulvilli elongate, the pulvilli yellowish. Tegule whitish. 
Wings brownish-grey ; small cross-vein slightly infuscate, under the end of the first vein and beyond the 
middle of the discal cell; posterior cross-vein distinctly undulate. 
Hab. Mexico, Sierra de las Aguas Escondidas in Guerrero 9500 feet (H. H. Smith). 
A single male specimen. 
5. Hyetodesia abacta. 
Hyetodesia abacta, Gigl.-Tos, Mem. R. Accad. Scienze di Torino, ser. 2, xlv. (sep.) p. 20 - 
Hab. Mexico}, Sierra de las Aguas Escondidas in Guerrero 9500 feet (H. H. Smith). 
A single male specimen. The pilosity of the eyes is longer than in any of the 
preceding species; the arista is also long-plumose. 
MYDAA. 
Mydea, Robineau-Desvoidy, Essai sur les Myodaires, p. 479 (1830). 
This genus is closely allied to the preceding, only differing from it in having the 
eyes bare. Schiner and Rondani have united it with the following, Spilogaster. From 
this latter it may be known by the broader form and by the want of symmetrical 
markings on the abdomen. 
Six species from Central America are represented in the collections before me :— 
}. Palpirufous 2. 2... 6 ee ww ew ee we ee 
Palpi black. 2. 2. 1. 1. ww ee ee ee ee ee ee 
2. Fulvous species . . . . 6. 2 6 © ew we ew ee et ee pansa, Gigl.-Tos. 
Cinereous or black species. . . - . 38. 
3. Third and fourth veins distinctly divergent towards ‘the end . a obscura, v. d. Wulp. 
Third and fourth veins nearly parallel towards the end . . . . 4 
4, Legsrufous. 2. 2. 2. 1. 1. 6 we ew we we we ee CONCINNA, V. d. Wulp. 
Legs piceous or black . . . . . . » 2 2 e «© 6fasciventris, v. d. Wulp. 
5. Antenne black ; vibrissze inserted above the oral margin . . leucocephala, v. d. Wulp. 
Antenne rufous ; 3 vibrisse inserted at the oral margin . . . . confinis, v.d. Wulp. 
1. Mydza pansa. (Tab. VIII. figg. 2, 6; 2a, 9; 26, head in profile, 9.) 
Spilogaster pansa, Gig].-Tos, Mem. R. Accad. Scienze di Torino, ser. 2, xlv. (sep.) p. 24’. 
Fulvous ; thorax with four black or brown stripes, in the male cinereous; hind borders of the second and 
third abdominal segments brown; antenne, palpi, and legs rufous. 
Length 9 millim. 
Front whitish-grey—in the male very narrow, scarcely separating the eyes, with the blackish frontal band 
reduced to a thin line—in the female as broad as the eyes, with the frontal band black, bifid on the 
vertex. Face and cheeks fulvous, with white reflections, the face perpendicular; vibrisse inserted at the 
oral margin, which is not prominent; behind the vibrissz is a row of shorter bristles ; lower part of the 
cheeks under the eyes narrow; beard yellow. Antenne yellowish-rufous ; second joint with some 
bristles ; third joint linear, three times as long as the second, and reaching to near the vibrisse; arista 
fulvous, short-haired. Proboscis brown; palpi yellowish-rufous, cylindrical. Thoracic dorsum in the 
male cinereous, with four distinct black stripes, of which the two lateral are prolonged behind the trans- 
