376 DIPTERA. 
The mediastinal cell is inconspicuous, owing to the auxiliary and first veins being very 
short and closely pressed against the costa. 
The species belonging to it have an ant-like aspect. Calobata arthritica, Wiedem. 
(Aussereur. zweifl. Ins. ii. p. 546), described without indication of origin, is evidently 
a Cardiacephala. | 
I have examined two species from Central America :— 
Legs yellowish ; tibie: simple ; small cross-vein infuscated . . . - « « myrmex, Schiner. 
Legs brown or black ; tibiee flattened ; small cross-vein not infuscated . . nigra, Schiner, 
1. Cardiacephala myrmex. (Tab. IX. figg. 31, 3; 31a, abdomen, ¢; 
32, abdomen, 2° .) 
Cardiacephala myrmex, Schiner, Dipt. Novara Reise, p. 254. 7 1‘; Gigl-Tos, Mem. R. Accad. 
Scienze di Torino, ser. 2, xlv. (sep.) p. 63. 67 *. 
Hab. Mexico 2, Medellin and Atoyac in Vera Cruz, Teapa in Tabasco (H. H. Smith). 
—Sovurn America }. 
Five males and three females. 
2. Cardiacephala nigra. 
Cardiacephala nigra, Schiner, Dipt. Novara Reise, p. 255. 72°. 
Hab. Mexico, Medellin near Vera Cruz (H. H. Smith); Guatema.a, San Gerénimo 
(Champion).—Sovutn AMERICA}. 
Two males and three females. 
The following species of Calobatinew have also been recorded from Mexico :— 
Nerius xanthopus, Schiner, Dipt. Novara Reise, p. 247. 48 (S. America); Gigl.- 
Tos, Mem. R. Accad. Scienze di Torino, ser. 2, xlv. (sep.) p. 64, 69. 
v plurivittatus, Bigot, Ann. Soc. Ent. Fr. 1886, p. 372. 
Micropeza pectoralis, Wiedem. Aussereur. zweifl. Ins. ii. p. 540. 13 (Calobata). 
divisa, Wiedem. loc. cit. p. 540. 14 (Calobata). 
According to Loew (Berl. ent. Zeitschr. 1868, pp. 393, 394) these two 
species belong to Micropeza. | 
incisa, Wiedem. loc. cit. p. 547. 2; Gigl.-Tos, loc. cit. p. 64. 69. 
Syn. Micropeza appendiculata, Schiner, loc. cit. p. 250. 55. 
Calobata calosoma, Bigot, loc. cit. p. 379. 7 (Teniaptera) ; Gigl.-Tos, loc. cit. p. 63, 
N.B.—Teniaptera pallidipennis, Big., and T. ornatipes, Big., belong to Tanypeza 
(see antea, p. 363); Megamerina fulvida, Big., to the Psiline (see p. 362). 
