On the Genus Dolichomyia, with the Descrip- 

 lion of a New Species from Colorado. 



BY S. W. WILLISTON. 



The genus Doliclwmxia was described rather incompletely by Wie- 

 demann,* but, so far as I can learn, has not been recognized since 

 except by Schiner,f who described a new species of it from Chile. 

 Even Macquart and Bigot have failed to say anything about it, and 

 Loewj; refers to it as a genus of doubtful relationships. The follow- 

 ing species, therefore, makes a very interesting addition to the North 

 American Bombyliid fauna. 

 Dolichomyia gracilis, n. sp. 



Male. Eyes broadly contiguous, leaving a small, silvery white 

 triangle below. Antennae black, the first two joints somewhat red; 

 first joint a little more than a half of the length of the third; second 

 joint about as long as broad; third gently tapering from near the 

 base. The exceedingly short face silvery white. Proboscis black, 

 twice the length of the head and antennae together, its terminal labella 

 small and not at all curved; palpi black, very slender, and lying 

 close by the proboscis, shorter than the antennae. Mesonotum shin- 

 ing black, with a geminate whitish poUinose stripe in the middle; the 

 humeri, a small spot on the post alar callosities, and another at the 

 base of the wings yellow; pleurae whitish pollinose. Abdomen very 

 slender and long, cylindrical, not enlarged at the extremity, com- 

 posed of eight segments besides the small hypopygium; the segments 

 dark brown in front and reddish or yellowish behind, the brown be- 

 coming greater in extent posteriorly; on the side of each posterior 

 margin, a small, silver-white spot. Legs yellow, the distal portion 

 of the hind tibiae, and all the tarsi, brown, or brownish, the brown of 

 the tarsi becoming more intense or blackish distally; hind tibi^ and 

 tarsi with spinulae. Wings hyaline; two or three submarginal cells 

 present; posterior cross-vein situated near the middle of the wing, 

 gently sinuous and nearly parallel with the costa. Knob of halteres. 

 large, dark brown or black. Length 9-11 millim. 



*Aus. Zw. Ins. ii. 

 tReise der Novara, Dipt. 

 iUiptf. Suedafrikas, 175. 



(41) KAN. UNIV. QUAE. VOL. Ill, NO. 1, .JULY. 



