226 A. L. MELANDER. 



the sides of rather large stones at the bottom of a moist ravine in 

 the vicinity of Mount Barker, a habit which has been observed 

 among European species of this genus. 



Tachydroniia enecator sp. nov. 

 Female. — Head shining, black, occiput very sparsely pollinose, and with a few 

 stiff black hairs, cheeks large; proboscis and palpi black, palpi as long as the 

 proboscis and appressed to it, provided with short black hairs; antennae short, 

 black, the outer joint short, with the slender bristle-like arista more than four 

 times the length of the antenna. Thorax, pleurae, scutellum and abdomen shin- 

 ing black. Legs shining, black, except the knees narrowly piceous, and the meta- 

 tarsi at the base piceous; middle and fore femora and tibige on their inner edge 

 with evident short spinose hairs. Halteres black. Wings marked with brown as 

 in fichwarzii, bnt differing in venation : near the apex of the marginal cell the 

 second longitudinal vein turns sharply obliquely forward, and at the turn is pro- 

 vided with a short adventitious spur jutting into the submarginal cell. The 

 third vein is slightly reflexed at the tip so that the first posterior cell is slightly 

 broader at its apex than just before, the fifth vein has not so strong a bend near 

 its base as is the case in Schwarzii, and therefore terminates in the wing margin 

 within the dark cloud ; anal cell completely wanting, the distance between the 

 two basal cross-veins longer than the strong basal section of the third vein ; the 

 distance between the tips of the third and fourth veins equal to fully one-third 

 of that between the second and third veins (in Schwarzii it is somewhat more 

 than one-third). 



Two females; St. John's Co., Quebec (G. Chagnon) ; Lance 

 Creek, Wyoming (Wheeler). 



Taohydromia Bacis Walker. 

 List of Dipterous Insects in the Collection of the British Museum, iii, p. 510. 



"Body dark ferruginous; eyes dark red; lip tawny, as long as the head; 

 feelers black; first and second joints dark tawny; third joint broad, nearly 

 round ; bristle very long, more than twice the length of all the preceding joints ; 

 abdomen piceous above; legs tawny, clothed with short black bristles; hind legs 

 stout and long ; wings colourless; wing-ribs ferruginous; veins piceous; poisers 

 tawny. Length of the body IJ lines ; of wing 3 lines. 



"Jamaica (Gosse)." 



Tachydroinia vittipeniiis Walker. 



Trans. Ent. Soc. Lond., N. S., iv, p. 149. 



" Black ; antennae and legs testaceous; wings gray, darker along the borders of 

 the veins; halteres whitish. Length of the body 2 lines; of the wing 4 lines. 



"U. S." 



Tachydromia iniista sp. nov. (Figs. 50, 54). 

 Length 3-4 mm. — Black. Inner joint of anteunse reddish yellow, outer fus- 

 cous, rounded ; style four times antenna. Palpi white, proboscis fuscous. Occi- 

 put ciuereous-dusted, with a white beard below. Thorax finely and closely 

 dusted, cinereous on the humeri and pleurae, and lightly bronzed on doi'sum; 



