266 DIPTERA FROM SOUTHWESTERN UNITED STATES 



PHAONIA R.-D. 



This genus as herein Umited includes species which have a 

 strong bristle on postero-dorsal surface of hind tibia beyond mid- 

 dle, the third vein bare at base, and not curved forward at apex, 

 the hind coxae bare at apex above; in the female the lower supra- 

 orliital bristle is weak, not directed forward, and the cruciate 

 interfrontals are absent. 



The genus is composite and must be redefined and the limits 

 further restricted. 



Phaonia monticola sp. n. 



Md'i and Female. — Black, shining. Interfrontalia of female and cheeks 

 of both sexes brown. Thorax, when seen from behind, with three gra_y pru- 

 inescent vittae on dorsum. Abdomen with a distinct l)lack dorsal stripe and 

 very poorly defined lateral checkering. Legs black. Wings slightly fuscous 

 towards ba.se and along veins. Squamae white. Spiracles black. Halteres 

 with knobs yellow. 



Male. — Eyes hairy, separated by less than width across posterior ocelli; 

 parafacials in profile nearh- twice as wide as third antennal joint, and about 

 half as wide as height of cheek; mouth very much produced; vibrissae dis- 

 tinctly above mouth margin; arista plumose; palpi verj- long and slender. 

 Thorax with four pairs of posterior dorso-centrals; presutural acrostichals not 

 setose; sternopleura with three bristles; hypopleura hairy above, in front of 

 spiracle. Abdomen elongate ovate; fifth sternite deeply excised in center. 

 Fore tibia not longer than fore tarsi, usually with one to two weak, hair-hke, 

 posterior bristles on middle, the inner or ventral surface with dense erect 

 hairs, which becorre longer on apical half, the longest at least equal in length 

 to diameter of tibia; mid femur with rather dense bristly hairs on basal half 

 of antero-ventral surface-, the longest about equal in length to portion of femur 

 upon which they are situated; the post ero- ventral surface with three to five 

 long, strong bristles on ba.sal half; mid tibia with two to three antero-dorsal, 

 two to four postero-dorsal, and two to three posterior bristles, the latter two 

 rows forming an irregular series which might be considered as an irregular 

 double posterior series; hind femur with a continuous series of long, strong 

 bristles on antero-ventral surface, and four to six strong, but short, bristles, 

 on basal half of post ero- ventral surface, none of which exceed in length the 

 diameter of femur; hind tibia slightly curved; antero-ventral surface with 

 two to four weak bristles; antero-dorsal surface usually with four bristles, one 

 pair near ba.se and another about middle; anterior and antero-dorsal surfaces 

 each ■n'ith a regular series of erect hairs, the longest of which is about half as long 

 as the bristles; in addition to the calcar there is a slender bristle near base on 

 postero-dorsal surface. Costal thorn weak; outer cross-vein oblique, slightly 

 curved. 



