184 XKW XOHTII AMERICAN ANTHOMYIIDAE (dIPTERa) 



their allies by having two vcn-y lono-, strong bristles on the hind 

 tibia beyond the middle, one on the antero-dorsal and the other 

 on the postero-dorsal surface. The eyes of the females are not 

 more widely separated as a rule than are those of the male. 



Prosalpia angustitarsis sp. n. 



Mule. — Bla(-k, slightly shining, with dense yellowish brown priiinescence. 

 Head black, orbits, face and cheeks with silvery pruinescence, interfrontali;i 

 opaque, sometimes reddish. Thorax with two narrow shining black vittae, 

 which are fused with the broad lateral pair, giving the thorax the appearance 

 of being bivittate. Abdomen with a linear black dorso-central vitta; hy- 

 popygium glossy black. Legs black. Wings clear, conspicuously yellow 

 at bases. Calyptrae and halteres yellow. 



Eyes separated by about the width across posterior ocelli; orbits narrow, 

 not obliterating interfrontalia, the former with long bri.stles on lower half, 

 the latter with a pair of long cruciate bristles; parafacial at base of antennae 

 much wider than third antennal joint, very much narrowed below; cheek 

 about as high as widest part of parafacial, armed with long bristles along 

 lower margin; antennae not extending to mouth-margin, third joint narrowed 

 in middle, about 1.5 as long as second; arista pubescent, with a very short 

 basal swelling. Presutural acrostichals irregularly two-rowed, two or three 

 I)airs of moderate length; prealar bristle very long; sternopleurals 2 :;3. Abdo- 

 men about as long as head and thorax combined, cylindrical; hypopygiuni 

 small, rounded, basal segments distinct; fifth sternite with broad, apically 

 rounded, knife-shaped processes, which have some very minute hairs along 

 the basal half of their inner margins and are otherwise bare, except for a few 

 bristly hairs on the outer third of their surfaces. Fore tibia with one or 

 two short antero-dorsal and one very long posterior median bristle; mid and 

 hind femora with stout bristles on antero- and postero-ventral surfaces; 

 mid tibia with one antero-dorsal, one postero-dorsal and one or two posterior 

 bristles; hind tibia with on(> anterior, one posterior, two antero-dorsal and 

 two postero-dorsal bristles. Outer cross-vein nearly straight. 



Female. — Similar in color to the male. 



Eyes separated by about twice the width across posterior ocelli; fore tarsi 

 not broadened; hind tibia usually with an additional antero-ventral bristle; 

 abdomen checkered on dorsum, ijoinlcd a( ajiex. 



Lcnglli, 7..") to it mm. 



Type.— 9; Machias, Maine, July 22, 1909, [B. S. N. H.]. 

 Allotype.-- d"; topotypieal. Paraty pes.— One male. Echo Lak{\, 

 Mt. Desert, Maine, July 17, 1918; one male, Southwest Haibor, 

 Maine, July 13, 1918; female, Machias, Maine, July 22, 1909; 

 female, Boisdale, Cape Breton, Nova Scotia, July 18 to 19. 



'i'ype and allotype are in the collection of the Boston Society 

 of Xatiiral Ilislory, male and female i)aratypes are in Hie eollec- 



