LIST OF DIPTERA. 621 



20. Erax APER. 



Piceus, nigro et ferrugineo hirtus ; caput subtus albido pilosum. 

 Mystax nigro et albido, setosus ; thorax ferrugineo bivittatus ; 

 fasciculo poslico albido; pectus ferrugi ne um; pedes vigri, 

 tarsis basi tibiisque rufis ; alee fuscce. Mas. — Abdomen fascia 

 lata alba. Fcem. — Abdominis latera cervina. 



Piceous. Head with whitish hairs. Mystax with black and 

 whitish bristles. Thorax with black dorsal hairs and with testaceous 

 bristles on each side and on the scutellum. Tarsi towards the base 

 and tibiae red. Wings brown ; veins black. Male. — Abdomen with 

 black hairs, and with some white hairs about the middle part, where 

 there is a broad white band. Fern. — Abdomen with testaceous 

 hairs. Length of the body 7 — 10 lines; of the wings 15 — 16 lines. 



a, b. Mexico. From Mr. Glennie's collection. 



West Indies. 



A. Pedes nigri. 



A. Thorax nigro quadrivittatus. - Caudex, Walk. 



B. Thorax nigro trivittatus. - invarius, Walk. 



B. Tibiae fulvae. 



A. Mystax niger, albido mixtus. 



a. Alae tiavesceutes. - rufitibia, Macq. 



r. Ala? limpidae, apice subfuscescentes. - fords, Walk. 



B. Mystax albus. - Haitensis, Macq. 



C. Tibiae tarsique testacea. ... fulvibarbis, Macq. 



D. Pedes pallidi ; femora ex parte, tibia; apice tarsique nigra. 



Haloesus, Walk. 



Group 1. 



Caput subtus densissime pilosum. Facies valde convexa. 

 Mystax dense setosus. Proboscis valida, lanceolata. Antennarum 

 articulus 3us longiconicus, lobrevior, aristae dimidio multo brevior. 

 Thorax hirtus. Abdomen subpubescens, basi hirtum, alas superans. 

 Pedes validi, hirti, spinosi. Mas. — Sexualia maxima. Fcem. — 

 Abdomen triente apicali slylata. 



Radial vein almost straight, joining the subcostal at rather far 

 from the tip of the latter. Cubital forked at very much beyond half 

 its length ; the forks very slightly curved, slightly converging at each 

 end. First, second and third externo-medial veins slightly curved ; 

 third forning an obtuse angle wilh the prabrachial, joining the 



