1910] Melander — The Genus Tachydromia 49 
Genera and Subgenera of the Tachydromive. 
Thorax slender, humeri large, strongly constricted: palpi narrow: legs not 
bristly: front femora thickest. 
First basal cell much shorter than the second: black species. 
Analcell present: arista terminal......-.:.....-.. Tachypeza Meigen. 
Anal cell completely wanting. 
Arista terminal or sub-terminal: marginal cell long. 
Tachydromia Meigen. 
Arista sub-dorsal: second vein abruptly recurved. 
Phoneutisca Loew. 
First basal cell longer than second; outer angle only of anal cell present: 
AVG OWES DECILES areverepaens, ¢ahc} «laus ayeexene see ahelgeren cgay Pate erotoe oe Dysaletria Loew. 
Thorax broad: humeri rarely large: legs hairy and usually with bristles: 
palpi usually broad. 
First basal cell shorter than second: eyes close together, especially below 
the antennae. 
Arista terminal. 
Anal cell complete or incompletely formed. 
Front and middle femora thickened: middle femora with a double 
row of spines beneath: middle tibiae ending in a spur: eyes 
Separacvedre palpi Orodds sca cmmme ae Platypalpus Macquart. 
Mast jomtrot tarsi moral... 0-5-6 ee oe Platypalpus s. str. 
Last joint of anterior tarsi greatly lengthened. 
Cleptodromia Corti. 
Femora not thickened: middle legs without spurs and with minute 
or no spines: eyes contiguous: palpi small: basal cells subequal. 
Sy mballophthalmus Becker. 
Anal cell wholly wanting: posterior femora more or less thickened. 
Drapetis Meigen. 
Body robust, abdomen shorter than thorax: Wings broad, not 
ciliate. 
Third antennal joint short-oval................ Drapetis s. str. 
Third antennal joint lanceolate.......... Elaphropeza Macquart. 
Body more slender: abdomen longer than thorax: wings cuneiform: 
costanlonovelliates ashe vs alae «1 oer Ctenodrapetis Bezzi. 
Arista dorsal: front femora thickened.................. Stilpon Loew. 
First basal cell equal to or longer than second: more or less opaque pollinose 
species: eyes usually widely separated on the face. 
Arista dorsal. 
Wings less than one-third the abdomen....... Thinodromia Melander. 
Wings surpassing the abdomen, anal cell faint. . .Halsanalotes Becker. 
Arista terminal. 
Antennae three-jointed: legs thick and bristly: eyes very small. 
Coloboneura Melander. 
Antennae two-jointed: legs but little thickened and with few bristles, 
PACEs Marrow seats ee Sissi) so aid ager sia tote Chersodromia Walker. 
