280 A. L. MELANDER. 



joint long, cylindrical, black, with long, dense, black hairs; second joint very 

 short, black, black-pilose; third joint wanting. Proboscis equal in length to the 

 thorax and head together. Occiput black, at the margin provided with long 

 black bristles. Thorax much convex, black-pilose, shining, greeu-black, me- 

 tallic, with faint vittae; pleurfe and pectus jet black, from thence submetallic. 

 Scutellum green-black, metallic, with long, black hairs on the posterior margin. 

 Halteres wanting. Abdomen acute apically, cyaneous, metallic, black-pilose at 

 the base. Front and middle legs short, hind cues gone ; coxae black ; front 

 femora broadly black at the base, apically yellow; front tibise broadly yellow at 

 the base, and apically black; front tarsi wholly black, first joint long and much 

 thickened ; middle legs yellow, with the very base of the femora and the extreme 

 tip of the tibiiB, and all the tarsal joints black ; front femora and frout and mid- 

 dle tarsi dark yellow-tomentose ; front and middle tibiae and middle femora with 

 rather long yellow cilia. Wings hyaline, fuscescent towards the base; submar- 

 ginal vein straight, perpendicular to the third vein. 4 mm. 



Augang, Mexico (Saussure). 



In addition to this diagnosis the following points drawn from a 

 female specimen from Amola in Guerrero, Mexico, will be of ser- 

 vice : — Third antennal joint shorter than the first two united, 

 pointed, its slender style equalling its own length. Mesonotum 

 evittate. Hind femora and tibise fringed with scales on both sides, 

 hind metatarsi not fringed ; front metatarsi elongate, flattened and 

 fringed. 



Liaiuprempis suavis Loew. 

 Cent, viii, 56 



Female. — Front and face blue-green, shining ; occiput chalybeous, moderately 

 shining. Antennae black, the first joint rather long, the third ovate, its bristle 

 shorter than itself; proboscis a little longer than the head. Thoracic dorsum 

 green, shining, chalybeous on the posterior margin. Pleurae almost black, but 

 green and shining bef6re the base of the wings. Abdomen rather thick, bright 

 chalybeous, shining. Femora piceous, extreme tip luteous; tibiae lutescent, a 

 little darker towards the tip, the apex of the hind ones fuscous; front tarsi fus- 

 cous, the middle joints lutescent, the first thickened ; middle and hind tarsi pale 

 lutescent, the last joints black. Halteres black. Wings very clear hyaline, veins 

 fuscous; the first section of the fourth longitudinal vein altogether obsolete, its 

 last part and the intercalary vein very slender, of a lighter color and vanishing 

 before the tip of the wing; the sixth vein much abbreviated ; the anterior branch 

 of the third vein straight and perpendicular. 2.5 mm. 



Mexico (Deppe, Berlin Museum). 



A single female from Chilpancingo in Guerrero, Mexico, has the 

 whole of the fourth vein uniformly developed. 



Ijainpreinpis chichimeca Wheeler et Melander (Figs. 100, 101, 102). 

 Biol. Cent. Am., Dipt. Suppl., p. 368, Nov. 1901. 



Male. — Shining metallic green. Face and occiput black, dusted with white. 

 Eyes contiguous on the front. Proboscis nearly as long as the head. Antennae 



