160 



nb:w north amkuican anthomyiidae (dipteka) 



7^^pg__^; Paradise Park. Mt. Rainier, Washington, August, 

 1917, (A. L. Melander). Allotype.— 9 ; topotypical. Para- 

 types.— Seven males and one female, topotypical; one male, one 

 female. Tuolumne Meadows, California, 9000 feet, August 16, 

 1916, (G.R.Pilate). 



This is the smallest species of the genus I have seen. 



The type and allotype are in Professor Melander's collection; 

 the paratypes are placed in the collections of the Academy of 

 Natural Sciences of Philadelphia, the Illinois State Natural 

 History Survey, U. S. National Museum, and that of Dr. Aldrich. 



Trichopticus johnsoni s^p. n. 



/l/„|c._Glossy, bluish black, thorax faintly white pruinescent, with shfiht 

 indications of four vittae, abdomen with a faint bhxck dorso-central vitta. 

 Lej^s black, tips of femora and extreme bases of tibiae slightly reddish. Wings 

 at bases, calyptrae and halteres bright orange-yellow. 



Eyes with long sparse hairs, separated by a Uttle more than width of anterior 

 ocellus; mouth-margin protuberant; parafacial as wide as third antenna! 

 joint; arista with very short pubescence. Thorax without strong presutural 

 acrostichals; four pairs of postsutural dorsso-centrals present. Abdomen 

 subovate; hypopygium of average size; fifth sternite normal. Fore tibia 

 unarmed at middle; mid femur elongated, with a group of short blunt bristles 

 on apical thirrl of antero-ventral and ventral surfaces, and eight very long 

 bristles on postero-ventral ; hind femur slender, distinctly longer than abdomen, 

 curved, its antero-ventral surface with a series of bristles from before middle to 

 apex; hind tibia much curved, with a series of moderately long setulose hairs 

 from near base to apex on antero-ventral surface, two or three antero-dorsal 

 bristles, two or three postero-dorsal bristles, a series of long erect hairs on 

 apical half of posterior surface, and dense erect setulose hairs on apical half 

 of ventral surface. Costal thorn minute; wing slightly pointed. 



Female. — Similar in color to the male. 



Eyes very indistinctly hairy; frons one-third as wide as head; interfrontalia 

 without cruciate bristles, .\bdomen more pointed than in male. Mid fenuu- 

 with a series of hair-like bristles on postero-ventral surface, and two strong 

 l)ristles beyond middle on antero-ventral; mid tibia with one or two antero- 

 dorsal and two or three postero-dorsal bristles; hind fennu- not curved, wifh 

 fewer and stronger bristles than male; hind tibia slightly curved, with thre(> 

 to five antero-ventral, two or three antero-dorsal and two or three postero- 

 dorsal bristles. 



Length, 7 to 8.25 mm. 



Type.— d"; North Adams, Massachusetts, June 18, 190(), 

 (C. W. Johnson). Allotype. — 9; Glen House, New Hampshire, 

 August 3, 1914. Faratypea. — Topotypical with type, one male; 



