1910J Mclander — The Genus Tachydromia 55 



In structure, venation, and general appearance this s|>ecies resem- 

 bles annulimana Meigen, of the European fauna; which however has 

 striped femora, incrassate front tibiae, an erect hypopygium, some 

 dorsocentral bristles in front of the scutellum, and moreover lacks the 

 white pruinose spots beneath the humeri. 



Tachydromia schwarzii var. diversipes var. nov. 



Melander, Trans. Am. Ent. Soc. xxviii. 225 (1902). T. schwarzii, var. 



Male. Similar to schwarzii in all structural characters, but differing in 

 coloration. The base of the legs is lighter, the outer portions blacker than in 

 typical form, thus making a greater contrast in color. The coxae, trochanters, 

 base of all the femora, the basal two-thirds of the front tibiae, and the tarsi 

 except the tip almost white in color. The outer third of the front tibiae is 

 abruptly black; the four posterior tibiae, except the knees, and the hind 

 femora except the base, black. The palpi are blackish. The cross-bands of 

 the wings are lead-gray, and are darker than is usually the case with schwarzii, 

 where they generally have a brownish tinge. 



l^\o males which I captured at Dry Creek, near Austin, Texas, 

 April 20, 1901. The specimens were running over rather large stones 

 in this moist ravine at the base of Mount Barker. 



Tachydromia ciliata s]). nov. 



Wheeler and Melander, Biologia Cent. Am., Dipt. Suppl. 375 (1901) 

 schwarzii. 

 Female. Length about 2 mm. Quite similar to schwarzii in general appear- 

 ance, but differing in the structure of the wings. Shining black, legs clear 

 yellow except the infuscated outer two-thirds of the hind femora and tibiae. 

 Antennae yellow; as they are defective nothing can be stated about the 

 arista. Front narrow, facets of the eyes uniform. Palpi whitish. Occiput 

 and thorax shining black, the propleurae not pruinose: humeri large and 

 deeply constricted: the inner pair of scvitellar bristles moderately long. First 

 ventral segment white or whitish. Halteres yellow. Wings comparatively 

 short and broad, blunt at the end, and margined with a conspicuous fringe 

 of hairs which are prominent even on the costa; two brown cross-bands are 

 present as in schwarzii, but because of the shortened wings the outer fascia 

 appears less extensive; the third and fourth veins more distant from each 

 other and continuing to the wing-tip without converging (in schwarzii they 

 lie closer together and converge towards the tip). 



I have two specimens before me from Guerrero, Mexico, one taken at 

 Chilpancingo, at 4600 feet altitude, the other labeled Sierra de las 

 Aguas Escondidas, 9500 feet. There are some minor differences 

 between the two specimens. The former measures 1.75 mm. and has 



