12 S. W. WII.LISTOX. .M. D. 



blacki.sh cloud un outer part of wingy, red tarsi and the more abundant, 

 denser and wholly yellow pilosity of the abdomen, except its tip. 



12. C.yrtopogon plaiisor 0. Sucken, West. JJipt. 297. 



Four male and one female specimens from Colorado agree perfectly 

 with the description. 



l-'l. CyrtopogOii callipediltlS Loew, 0. Sackeii, West. Dipt. 296. 



A female from Southern Wyoming (alt 8000) agrees throughout with 

 the description. 



14. Cyrtopogoii praepes n. sp. 



"J, 9 ■ — Seutelluiii fouvex above, pilose; legs densely pilose, wholly black ; front 

 tarsi of the male with a single row of silvery pile from the very base and the 

 terminal joints of middle tarsi with a disk of black pile, longer than broad; sides 

 of the abdomen at base white pilose, shorter and black on distal portion. Length 

 11— 12 mm. 



'J,. — Black, shining. Face thickly liglit yellowish pollinose, but concealed be- 

 neath the dense light yellow mystax, black on the oral margin. Beard, anterior 

 and middle coxae, first two segments of the abdomen on the sides, and all the 

 femora below, and on the posterior part, thickly, nearly white pilose; front, upper 

 part of the occiput, basal joints of the antennae, dorsum of thorax and scutellum, 

 dorsum of abdomen and sides from the second segment, upper surface of femora 

 and all the tibiae black pilose. Dorsum of thorax with two large spots on each 

 side of the middle in front, brownish pollinose: jjleurae thickly light pollinose. 

 Legs wholly deep black, the posterior tibiae at tip and their metatarsi with golden 

 red pubescence. Legs not very stout, nor the bristles very strong; anterior tarsi 

 slender, on their upper side for their whole length with a row of short, dense, 

 silvery pile, not parted, except at the tip, the surface below is smooth, but along 

 the sides there is a fringe of very short black bristles; two last joints of middle 

 tarsi with the disk of black pile narrower than in the other species, longer than 

 broad. Wings nearly hyaline. 



9- — Like the male, but the face is a little more bare upon the sides, the pile 

 throughout somewhat shorter, the dorsum of the thorax more grayish pollinose 

 in front leaving two slender medium dark stripes; the light pile of the abdomen 

 is less abundant and extends on the sides to the fourth segment, and the black pile 

 very short, on the posterior angles of the second, third and fourth abdominal 

 segments there is a ?lnall silvery spot: the pile of the femora is more obscure, the 

 silver pile of the front, and the black disk of the middle tarsi wanting. 



Two % and two 9 specimens, Washington Territory. 



This species is closely allied to cdllipeiUlus, cymlttdista, plmoior and 

 the following: 



15. Cyrtopogon n. sp. 



Represented by three males and two females from Northern California. 

 The males throughout are nearly like praepes. except in the tarsi, which are 

 shorter, and the front and middle pairs are ornamented like ci/inbalista is 

 described to be, that is the first joint of the front pair has but little silvery 



