86 GENUS XIPHANDRIUM IN NORTH AMERICA 



Foie coxae wholly yellow; middle and hind ones black with yellow tips; 

 fore and middle pairs with yellow hairs on their anterior surface, hind pair 

 with yellow bristle on the outside; middle ones with a yellow spine at tip. 

 Femora yellow, nearly bare below; posterior pair a little infuscate near the tip 

 above. Tibiae yellow with only very small bristles; posterior tibiae slightly 

 infus(;ated at tij). Fore and middle tarsi slightly longer than their tibiae, 

 infuscated from the tip of the first joint; fore metatarsi as long as the following 

 four joints taken together and with a row of minute bristles below. Hind 

 tarsi scarcely as long as theii tibiae, black from the tip of the first joint, which 

 is dark j^ellowish and about as long as second joint. Calyjiters, their cilia 

 and the halteres, yellow. 



Wings grayish; last section of fourth \^ein bent near its middle, where it is 

 quite widely separated from third vein, the third vein running rather close to 

 second as far as this point, from this point the third and fourth veins approach 

 each other a little, then run nearly parallel to their tips, the fourth ending in 

 the apex of the wing; last section of fifth vein about two and one-half times 

 as long as the cross-vein; sixth vein quite widely separated from the wing 

 margin, the anal angle of tlK> wing being somewhat ])rominent. 



Descriljed from one male, taken by L. 0. Jackson, at Geneva 

 Park, Grant Goiinty, Colorado, July 23, 1910, at an elevation 

 of aljout 9,000 feet. Type in the author's collection. 



Perhaps a new genus should be formed to receive this species, 

 l)ased on the small front and its lack of bristles, but as it is 

 possible that the bi'istles may have been broken off in the single 

 speciinen we have, it see:<ns best to wait until more material is 

 found. Otherwise it fits well in this genus. 



Xiphandrium aldrlchi ninv species (Text-figs. 9 and 10.) 



cf: Length, 2.7.5 to 'A nun. I'ace white, not very narrow. Front green, 

 dull. Palpi blackish er yellowish brown, small. Antennae black, nearly 

 twic(> as long as the height of the head; third joint of about equal width, 

 ril)bon-like, somewhat folded up, inibescent; arista very short, scarcelj' as 

 long as tlu! width of the third joint. Lateral and inferior orbital cilia white. 



Thorax gieen, dulled with gray i)o]lon. Abdomen green with black hair, 

 those on the lower edge of the si<lcs yellow, llypopjgium and its appendages 

 black; there arc Iwo pair of l;\nicll;ic-lik(' appendages (figs. 10 and 9), these 

 do not .seem to be united at base, but I do not see that either can be called 

 an outer or inner ajjpendage as in other species; one is long and furnished wit h 

 long pale hairs, the other pair have an oval tip tapering into a slender stem, 

 these also have long pale hairs. 



Fore coxae yelicjw, slightly darker on outer side at base; middle and hind 

 coxae black on })asal, yellow on apical half; the hairs and bristles of all coxae 

 yellow. Femora and til)iae yellow, only the tii)s (,f posterior tibiae brown, 

 their bristles very .small. .All tarsi blackened from the tip ( f the first joint: 

 fore tarsi ;il)()iit .-is long as llieii- I ibiac, the lirsl joint but lill e lungci' tiiini the 



