DIPTEKA. 321 



on the posterior part of all the segments ; the first, third, fourth, and fifth broadly black in front, the 

 sixth wholly black-haired. 



Hab. Mexico, Atoyac in Vera Cruz (Schumann). 



Two examples, male and female, apparently referable to the same species. I give a 

 name to this insect with some hesitation, since, as Osten Sacken has already remarked 

 (antea, p. 189), the identification of species in this genus from among the many 

 descriptions is a very difficult, or almost impossible, task. Extensive collections and 

 patient study will be needed to determine the limits of variation and the sexual 

 differences. 



9. Mallophora breviventris. 



? Mallophora breviventris, Macq. Dipt. Exot., Suppl. iv. p. 77, t. 7. f. 1 \ 

 Hab. Mexico, Rio Papagaio in Guerrero (H. II. Smith). — Brazil 1 . 



Nine specimens, including both sexes. The males have the scutellum partly 

 covered with yellow pile, no vestige of which is visible in the female. The identity 

 of the Mexican species with that described by Macquart is of course more or less 

 doubtful. It must resemble M. beelzebul, Schiner, but is distinctly smaller. Length 

 15 millim. 



PROMACHUS (p. 192). 



Promachus cinctus (p. 193). 



To the localities given, add : — Mexico, San Lorenzo, near Cordova (M. Trujillo). 



A single female specimen. It has the bristles of the face wholly white, and the 

 hair at the base of the abdomen also white, not yellowish. 



Promachus forfex (p. 194). 



Promachus quadratics, Bellardi, Saggio etc. ii. p. 27, t. 2. f. 3 x (nee Wiedem.). 

 Promachus forfex, O. Sack, antea, p. 194 2 . 



To the locality given, add :— Mexico 1 , Atoyac in Vera Cruz (Schumann). 



A single male specimen. The bristles of the face are yellow, save at the upper 

 part. I have no doubt of the synonymy, of which O. Sacken did not feel certain, 

 P. quadratus being included by him amongst the unidentified species at the end of 

 the genus (antea, p. 197). 



Promachus anceps (p. 194). 



To the localities given, add :— Mexico, Atoyac in Vera Cruz (Schumann). 



One female specimen, agreeing well with the description. 

 biol. centr.-amer., Dipt., September 1901. 2 * 



