DIPTEKA. 273 



12. Exoprosopa pavida, sp. n. 



6 ■ Face conical ; proboscis with the tip of the labella protruding beyond the oral margin ; third joint of the 

 antennae elongate-conical, the style equal to about one-third the length of the joint, short. Front tibiae 

 without spinules ; front tarsi with erect pile. Wings brown in front, the brown including the base of 

 the second basal cell ; basal veins of the second, third, and fourth posterior cells, the outer submarginal 

 cell, the posterior veins, and the anterior end of the inter-submarginal vein, with conspicuous dark brown 

 clouds ; first posterior cell open. Legs black. Length 12 millim. 



Hah. Mexico, Chilpancingo in Guerrero (H. H. Smith). 



One specimen. The abdomen has black and white tomentum. A second, larger, 

 example, from Amula, has the spots of the wings smaller, and those on the posterior 

 veins absent ; the third antennal joint shorter, the style two-thirds of its length ; and 

 the second abdominal segment with a complete white band. Omer specimens, from 

 Acaguizotla, are rather smaller than the first, the wings more nearly as in the second, 

 the style intermediate in length. I am not sure whether these all belong to one 

 species. 



HYPERALONIA (p. 89). 



Velocia, Coquillett, Canad. Ent. xviii. p. 158 (1886). 



The characters applied to this genus by Osten Sacken limit it sharply from Exo- 

 prosopa ; nevertheless, in E. erythrocephala, Wiedem., the third joint of the antennae 

 has a minute style, very much like that of Stonyx, though the front legs, the hind 

 ungues, and the wings agree otherwise with those of the normal species of Hyperalonia. 

 This character alone is hardly sufficient to define a genus, especially as the wings 

 do not show a very different pattern of coloration. The metallic body is, however, 

 aberrant. The definition of the genus must therefore be modified to include species 

 with a long or a short style to the third antennal joint. 



Hyperalonia proserpina (p. 92). 



Exoprosopa cerberus, Macq. Dipt. Exot. ii. 1, p. 38, t. 16. fig. 5 \ 



To the localities given, add : — Mexico, Teapa in Tabasco (H. H. Smith). 



Eleven specimens, all agreeing with the observations of Osten Sacken. I have 

 numeious others agreeing with these, from Chapada, Brazil. 



Hyperalonia kaupi (p. 94). 



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

 Two specimens, agreeing with Jaennicke's description and figure. 



biol. cente.-amek., Dipt., June 1901. 2 n 



