308 DIPTERA FROM SOUTHWESTERN UNITED STATES 



Hylemyia duplicata sp. n. 



Male. — Black, densely gray pruinescent. Orbits, face and cheeks with 

 silvery pruinescence; frontal triangle rufous; antennae black, second joint 

 bro^\Tiish at apex; palpi black. Thoracic dorsum with three fuscous vittae. 

 Abdomen with a fuscous dorso-central stripe. Legs ferruginous, coxae and 

 a longitudinal stripe on postero-dorsal surface of fore femora fuscous. Calyp- 

 tra white. Halteres whitish yellow. Wings clear, veins brown, cross-veins 

 very faintly infuscated. 



Eyes in type separated by distinctly less than width across posterior ocelU; 

 orbits contiguous, obliterating interfrontaha for a considerable distance below 

 ocelli; arista microscopically pubescent; parafacials as broad in profile as third 

 antennal joint; height of cheek one-sixth that of eye; bristles on frons not 

 carried beyond middle. Thorax with three strong pairs of presutural acros- 

 tichals; sternopleura with four bristles. Abdomen cylindrical; the forwardly 

 directed apical processes of hypopygium slender, armed along their lower sur- 

 faces (when directed forward) with dense, very short, black bristly hairs (fig. 

 4); fore tibia with one antcro-dorsal bristle, and one posterior; mid femur with 

 two to three strong bristles on basal half of postero-ventral surface; mid 

 tibia with one antero-dorsal, one postero-dorsal, and two posterior bristles; 

 hind femur with a complete series of strong, rather widely spaced bristles on 

 antero-ventral surface and two to three on postero-ventral &t middle; hind 

 tilna with one antero-ventral, two antero-dorsal, and two postero-dorsal bris- 

 tles. Costal thorn shorter than inner cross-vein; outer cross-vein verj' oblique, 

 distinctly bent. 



Female. — Similar to the male in color, the anterior half of interfrontaha red. 



Eyes separated by at least one-third the head-width at vertex, wider an- 

 teriorly; cruciate bristles absent. Fore tarsi normal. Length, 7 to 8.5 mm. 



Typc—d"; Yosemite Valley, California, May 22, 1908, [A. N. 

 S. No. 6215]. Paratypes. — 3 .cf , 1 9 , topotypical; 2 cf , Redwood 

 Canon, Marin County, California, May 17, 1908; 1 d", 2 9, 

 Berkeley Hills, California, April 20, 1908; 1 cf,- same locality, 

 March 14, 1908; 1 d^, Grizzly Peak, Berkeley Hills, California, 

 March 23, 1908; 1 d", Cloudcroft, New Mexico, June 19, 1902; 

 1 d, Beulah, New Mexico, June 28, 1902; 1 d, Troy, Idaho, 

 May 31, 1908. 



The series shows a considerable variation in size and color, 

 the antennae being sometimes almost entirely black, and some- 

 times with the second and base of third joint rufous, while the 

 palpi are black with pale bases or almost entirely pale. Two of 

 the specimens from the type localitj^ have the eyes closer together 

 than the others and are in other respects slightly different, but 

 the hypopygia of the males present no tangible distinctions and' I 

 consider them as merely variants. The mid tibia has sometimes 

 a weak antero-ventral bristle. 



