OSTEN SACKEN ON WESTERN DIPTERA. 335 



two joints yellowish-brown ; third joint light brown, excised above, so 

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

 boscis 7-8 mm 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 thorax, 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 



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



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

 second vein with small brown clouds ; stigma brown. 

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

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



j 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 



j 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. 



Arctophila flagrans Osten Sacken, Bulletin Buffalo Soc. N. H., 



jiii, 1875, 69. — Male. — 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 



1 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 tibiae 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 more deeply sinuate than in A. bombiformis. 



^Length 13 mm . 



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

 Eristalis hirtus (Eristalis hirtus Loew, Centur., vi, 66; Eristalis 



