in the Collection of W. W. Saunders, Esq. 149 



Genus Tachydromia, Fabr. 

 Tachydromia postica. 



Nigra, antennis, abdomine basi subtus pedibusque testaceis, 

 femoribus tibiisque posticis piceis, alis cinereis, venis nigris, 

 halteribus albidis. 



Black ; antennae, abdomen at the base beneath and legs testa- 

 ceous ; hind femora and hind tibiae piceous ; wings cinereous, 

 veins black ; halteres whitish. 



Length of the body 1| lines; of the wings 3 lines. 



United States. 



Tachydromia vitttpennis. 



Nigra, antennis pedibusque testaceis, alis cinereis apud mar- 

 gines obscurioribus, halteribus albidis. 



Black ; antennae and legs testaceous; wings grey, darker along 

 the borders of the veins ; halteres whitish. 



Length of the body 2 lines ; of the wings 4 lines. 

 United States. 



Fam. 10. DOLICHOPID^. 



The European species of this family are from 150 to 200 in 

 number, and the exotic species, which contain no genera different 

 from those of Europe, may amount to 100 or 150. 



Genus Psilopus, Megerle. 

 Psilopus ungulivena. 



Mas. — Laete viridis, antennis nigris thorace longioribus, thorace 

 subcyanescente, abdomine subaurato, pedibus testaceis, alis 

 subcinereis, venis nigris. 



Male, — Bright green ; antennae black, much longer than the 

 thorax ; thorax slightly bluish ; abdomen somewhat gilded ; legs 

 testaceous, long, slender ; wings greyish, veins black, fore-branch 

 of the praebrachial veins very much bent, nearly rectangular; 

 discal transverse vein very deeply undulating. 



Length of the body 4| lines ; of the wings 7 lines. 



United States. 



