J. R. MALLOCH 187 



topotypical; one male, Lewisport, Newfoundland. July to August 

 1905, (L. P. Grataeap); one male and two females, (lodbout, 

 Quebec,. C\anada, July 25, 1918, (E. M. Walker). 



Type in the collection of the Illinois Natural History Survey; 

 paratj^pes are in the collections of the Academy of Natural Sci- 

 ences of Philadelphia, Boston Society of Natural History, Cana- 

 dian National Collection, and the American ^Museum of Natural 

 History. 



This species belongs to the same group of species as fvscipe.s 

 Zetterstedt and is not closely related to yracilipes, though })os- 

 sessing the same form of apical bristle on fore til)ia, and for this 

 reason placed with it in this paper. 

 Hylemyia gracilipes sp. n. 



Male. — Black, .subopaquc, tlciisely gray pruinescent. Head black, anterior 

 margin of frons and parafacial at base of antennae nsnally reddish; jmlpi 

 fu.scous. Thorax not distinctly vittate. Abdomen with a narrow dorso- 

 central black vitta. Legs pitchy black, knees and usually the til)iae i)aler. 

 Wings clear, veins yellowish. 



Eyes separated by a little more than width of anterior ocellus; i)arafacial 

 at base of antenna as wide as third antennal joint, slightly narrowed below; 

 cheek a little less than twice as high as width of parafacial, with a series of 

 bristles along lower margin; arista with its longest hairs about twice as long 

 as its basal diameter. Presutural acrostichals two-rowed, one i)air usually 

 longer than the others; prealar absent or minute; sternopleurals 1:2. Abdo- 

 men slender, depressed; hypopygium of moderate size, the inferior force{)s 

 very long, not very slender, flattened apically; fifth sternite as in angut^tn 

 Stein (see fig. 31). Legs slender; fore tibia with a posterior median bristle 

 and a long, curved, blunt-tipped apical bristle on posterior side; mid tibia 

 with one or two postero-dorsal and posterior bristles; mid tarsus with the 

 apical bristle on posterior siile of segments two to four longer than normal; 

 hind femur with five or six short, widely-spaced bristles on apical thre(>- 

 fourths of antero-ventral surface, postero-ventral surface unarmed; hind 

 tibia usually with three bristles on antero-ventral, antero-dorsal and postero- 

 dorsal surfaces. Wings rather narrow, slightly pointed; costal thorn small 

 l)ut distinct. Length, 5 to 6 mm. 



Type.— d'; Lima, Montana, July 1, 1913, [Mont. Exp. Sta.]. 

 Paratypes. — Four males, topotypical; one male, Armstead, Mon- 

 tana, July 3, 1913. 



This species is very closely related to angusta Stein, but the 

 latter has the apical half of the posterior surface of fore femm- 

 densely covered with short, stiff, decumbent hairs, while (jnicili pe>< 

 has the haii's sparse and erect. 



TRANS. AM. ENT. SOC, XLVl. 



