OSTEN SACKEN ON WESTERN DIPTERA. 335 



two joints yellowish-browo ; tbird joint liglit brown, excised above, so 

 that its latter portion is much narrower; arista featherj^, black ; pro- 

 boscis 7-8'"™ long, black, pointed. Thorax densely clothed with a yel- 

 lowish recumbent pubescence, and, mixed with it, short, black, erect 

 pile ; they almost conceal the dark greenish ground-color, as well as the 

 obscurely visible yellowish lateral stripes and large yellowish spot in 

 front of the scutellum ; on the sides of the f horax, several stiff, black 

 bristles ; a pair of such bristles, but smaller, a little in front of the scu- 

 tellum ; pectus blackish. Scutellum somewhat inflated, honey -yellow, 

 beset with a mixed black and yellow pubescence ; along the edge four- 

 teen stiff black bristles. Abdomen brownish-yellow ; second and third 

 segments with broad blackish parallel borders posteriorly, formed by 

 short and very dense black hairs; the cross-bands thus produced are very 

 distinct when viewed obliquely, although almost invisible from above ; 

 that on the second segment occupies more than one-third, that on the 

 third more than one-half of the length of the segment; segment 4 

 shows posteriorily a semicircular, black, shining spot, occupying the 

 whole posterior margin and reaching beyond the middle of the segment 

 anteriorly; segment 5 -is black. Femora black; knees and anterior 

 half of the tibise brownish-yellow ; the remainder of the tibiae as well as 

 the tarsi are darker. Wings grayish-hyaline; cross-veins and tip of 

 second vein with small brown clouds ; stigma brown. 



Hal). — Vermejo Eiver, New Mexico, June 25 (W. L. Carpenter). 



I do not hesitate to describe this well-marked species, although I have 

 only a single, not very well preserved female. On account of the bris- 

 tles on the scutellum and the shape of the third antennal joint, I place 

 it in the genus Temnocera, although I do not think that this genus is 

 defined in a very satisfactory manner. 



Temnooera megacephala Loew, Centur., iv, 57.— California. I do 

 not know this species. 



Aectophila flagrans Osteu Sacken, Bulletin Buffalo Soc. N. H., 

 iii, 1875, 69. — Bfale. — Face wax-yellow. Cheeks black. Antennae : basal 

 joints brownish ; third joint reddish, the plumose arista black. Thoracic 

 dorsum densely clothed with yellowish hair, through which, however, the 

 metallic brownish-coppery ground-color is apparent ; pleurae black in the 

 middle, with a stripe formed by yellow pile. Abdomen with long yellow 

 pile at the base and on the sides, with reddish hair in the middle and 

 at the tip; between the hairs, the black metallescent ground-color is 

 apparent. Legs black ; front tibite beset on the inside with short golden- 

 yellow hairs ; three basal joints of the four posterior tarsi brownish-red. 

 Wings with a slight grayish tinge ; a brown spot limited by the fourth 

 longitudinal vein, the costa, the small cross-vein, and the origin of the 

 third vein ; the latter vein is moredeeply sinuate than in A. bombij'ormis. 

 Length 13'"'". 



Hah. — Colorado Mountains (Lieut. W. L. Carpenter), A single male. 



Eristalis hirtus {Eristalin hirtus Loew, Centur., vi, 66; JEristalis 



