TANYPEZA. 363 
Closely allied to the preceding species (7. claripennis), but differing from it in the rufous coloration of the 
body. Front deep black; a spot behind the ocelli and two triangular spots above the antenna silvery- 
white; in the male the front is a little broader than in the corresponding sex of 7. claripennis. Face 
and cheeks pale rufous, the cheeks and posterior orbits with silvery-white reflections. Antenne, 
proboscis, and palpi rufous. Thorax, scutellum, and abdomen rufous, somewhat shining ; on the pleure 
a white oblique band extends from the shoulders to the middle coxe; second abdominal segment with 
bristly hairs at the sides. Legs very slender, rufous; middle and hind tibiw (save a ring beneath the 
middle) and the tip of the front femora brown; the fore legs with the tibia and the basal half of the 
first tarsal joint white and the rest of the tarsi black; middle and hind tarsi wholly black; hind tibie 
slightly curved near the base; hind tarsi with a small projection at the base (also present in T. claripennis 
and other species). Halteres pale rufous. Wings hyaline, with a slight yellowish tinge. 
Hab. Mexico, Sierra de las Aguas Escondidas 7000 feet, and Omilteme 8000 feet, 
both in Guerrero (H. H. Smith). 
One male and two female specimens. 
Three other Mexican species of Tanypeza have been previously described :— 
Tanypeza pallidipennis, Bigot *, Ann. Soc. Ent. Fr. 1886, p. 380. no. 8. 
ornatipes, Bigot, loc. cit. no. 9. 
mexicana, Gigl.-Tos, Mem. R. Accad. Scienze di Torino, ser. 2, xlv. (sep.) 
p- 61. 
T. pallidipennis is probably nothing more than a small specimen of I. claripennis, 
Schin., and 7. mexicana may be identical with 7. ornatipes, Big. 
The genus Tetradiscus, Big., based upon a Mexican species, 7. notatus, Big. (Ann. 
Soc. Ent. Fr. 1886, p. 374), most likely belongs also to the Tanypezine. 
Group CALOBATINZ. 
Flies of moderate or small size and of slender form. Head rounded or elongate, 
more or less broad; front with only some weak and short bristles; vibrisse absent. 
Abdomen of the female prolonged into a cylindrical tube, which is curved down to 
the venter. Legs rather long, but with the tarsi shorter than the tibie; tibie without 
a preapical bristle. Third and fourth veins convergent towards the tip of the wing; 
inferior basal cells of different sizes, the third sometimes prolonged into a point. 
The following genera are represented in the Mexican collections under examination :— 
1. Arista apical or subapical . . 2. 1 ee ee ee ee wee ~Nerius. 
Arista dorsal a ~ 2. 
2. Second basal cell not closed by a cross-vein and united with the discal cell . Micropeza. ° 
Second basal cell as usual closed by a ccross-vein. . . . . «©... » 8 
8. Auxiliary and first veins always distinct; femorasimple . . . . . . . Calobata. 
Auxiliary and first veins very short, pressed against the costa, and less con- 
spicuous ; intermediate and hind femora swollen in the middle . . . Cardiacephala. 
* Bigot gives the generic name as Twniaptera, but evidently in mistake for Tanypeza, as may be deduced 
from his descriptions. 
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