AMERICAN DII'TKRA. 11 



9. IIai>r<>|>ogon biliiieatus n. s]). (Plate I, fig. 8.) 



9.— Black, gniy jiolliiiuse, niyslax white; dorsum of thorax yellowish-gray, 

 with two slender opaque black stripes; 1-5 abdominal segments with red borders; 

 under side of all the femora and base of tibiae red. Length 15 mm., of wings 

 9 mm. 



Face and mystax white, the former' opaque; front a little yellowish gray, the 

 few short bristles black. Antennae and proboscis both short black. Dorsum of 

 thorax gray with a yellowish or brownish cast, the ground color of humeri, post- 

 alar callosities and scutellum appears to be yellowish red; in the middle two 

 slender narrowly separated, but very distinct, opaque black stripes, obsolete in the 

 posterior part ; bristles wholly black. The ground color of the pleurae apparently 

 in large part reddish, but concealed beneath dense, very light colored pollen, 

 which also covers the coxae. Abdomen black, rather thinly yellowish grayish 

 poUinose, the terminal segments more shining, the sides and posterior margins of 

 the first— fourth segments and the sides of the fifth red ; the pile is very short. 

 Anterior and middle coxae thickly clothed with white pile. Legs black ; the un- 

 der side of all the femora broadly red. the base of hind tibiae and the four front 

 tibiae, except their tip, red. or yellowish fed. Wings nearly hyaline, veins black. 

 One specimen N. California (0. T. Baron). 



DICOLOXUS. 



10. Dicoloims simplex Loew, Centur vii, ofi. (Plate I, fig. 4.) 



I rocoo-nize this species in two male and one female specimens I'rum 

 Southern California. The pile, however, appears to be lighter colored, 

 and in only one specimen is there any black pile on the front, and none 

 have any at the tip of the abdomen. 



CYRTOPOGOSf. 



11. Cyrtopogoii dasylloides n. sp. 



% .—Black, thickly black pilose; mystax thick, light yellow; coxae with white 

 pile. Abdomen, except the tip, with long, dense, furry, erect, light yellow pile; 

 tarsi red; wings hyaline, the distal half in front blackish. Length 17 mm. 



Face very thickly light yellowish pilose, on the lowest portion somewhat black : 

 beard white. Style of antennae short, thickened. Pile of the front, occiput, and of 

 first two joints of antennae black. Thorax thickly black pilose, dorsum nearly 

 opaque, on the sides of the middle in front a little brownish pollinose: bristles 

 not strong. Scutellum thickly pilose, not pollinose, convex. Abdomen nearly 

 parallel on the sides, siiining. but its shape and color nearly concealed by the very 

 long, erect, furry, yellow pile, the first segment with a very little black pile above 

 on the sides, and the last segment and hypopygium wholly thickly black pilose. 

 Coxae white pilo.se. Legs black, densely black pilose, hind tibiae deep red, all the 

 tarsi lighter red, the front pair with white pile. "Wings hyaline, the outer half in 

 front from the margin of the third vein blackish, a little lighter at the tip, and 

 fading out behind. 



One specimen, Washington Territory. 



This remarkable species falls into the group of I. A. aa. i.f Osten 

 Sacken's synoptical table (West. Dipt. p. 294) and is allied to C. aurifex 

 0. 8. from which it will be readily distinguished by its much larger size, 



