DIPTEEA. 



323 



Erax anomalus (p. 199). 



Efferia anomalis, Coquillett, Canad. Entom. xxv. p. 175 l . 



To the localities given, add :— Mexico, Tepetlapa in Guerrero (H. H. Smith). 



A single specimen. Mr. Coquillett l has proposed the generic name of Efferia for 

 this and other species of Erax having three submarginal cells, but, as I have shown 

 (Entom. News, v. p. 137), the genus is not tenable, since it must include a number of 

 heterogeneous forms having this character in common ; if it is regarded as valid, the 

 name Eichoichemus, Bigot, has priority. 



Erax maculatus (p. 200). 



To the localities given, add :— Mexico, Guerrero &c. (H. II. Smith). 



Erax cinerascens (p. 202). 



To the localities given, add. :— Mexico, Guerrero &c. (H. II. Smith). 

 Thirty-five specimens of this very widely distributed insect are contained in the 

 Mexican collection before me. 



Erax prolificus (p. 202). 



To the locality given, add:— Mexico, Venta de Zopilote in Guerrero (H. H. Smith). 



Ten specimens, agreeing with Osten Sacken's description. There is, however, some 

 long white hair on the first three abdominal segments, not mentioned by him. 



8 (a). Erax concinnatus, sp. n. 



S Closely allied to E. prolificus, but with the hair of the face, occiput, beard, posterior part of the 

 mesonotum, and scutellum quite yellow (not white), and the second and third abdominal segments 

 without a grey-pollinose band posteriorly. The tips of the tibiae, and the tarsi for the most part, 



are black. 

 9 Like the male, but with the abdomen black, with the lateral margins of the segments 2-6 broadly grey, 

 the grey coloration expanding narrowly across their posterior margin. Ovipositor and wings as in 

 E. prolificus. Length 20 millim. 



Hob. Mexico, Acaguizotla and Rincon in Guerrero (H. H. Smith). 

 Ten specimens. 



8 (b). Erax carinatus. 



? Erax carinatus, Bellardi, Saggio etc. ii. p. 36, t. 2. f. 9 \ 



Hab. Mexico x , Acaguizotla and Kincon in Guerrero (H. H. Smith). 



Fifteen specimens. These insects agree with Bellardi's description, except as 



Z t -i 



