168 NEW NORTH AMERICAN ANTIIOMYIIDAE (dIPTERa) 



pruinescenoe than orbits; palpi black. Thorax when viewed from above 

 with the dorsum brownish black, the lateral margins and pleura with bluish 

 gray pruineseence. Abdomen bluish gray pruineseent, most noticeably 

 so on sides, dorsum with the usual spots fused and forming a broad brown 

 vitta, which is slightly subdivided in center; fourth tergite with a shining, 

 bare, black area along each anterior lateral margin, which is only narrowly 

 visible; hypopygium and fifth sternite black. Legs pale yellow, coxae largely 

 grayish, tarsi slightly infuscated. Wings slightly grayish, white basally. 



Frons in profile slightly buccate, one-third as wide as head; each orbit 

 with four bristles, one very weak; parafacial narrowed below; antennae 

 extending nearly to mouth, third joint narrowed apically; arista bare; paljji 

 pointed. Thorax with strong bristles; acrostichals two-rowed. Abdomen 

 a little longer than thorax, cylindrical basally, slightly compressed apically; 

 hypopygium small; processes of fifth sternite about twice as long as broad, 

 rounded at apices, with a few weak bristles. Legs slender, femoral bristles 

 weak; tibial bristles normal in number, short and weak; hind tarsus much 

 longer than tibia, basal joint at least half as long as tibia. Last section of 

 fourth vein over three times as long as preceding; veins three and four slightly 

 divergent apically. Length, 2.25 mm. 



Type.—d^; Grant, C\)lora(lo, August 19, 1914, (E. C. Jackson), 



[U. S. Biol. Sui'v.]. 



Fannia lasiops sp. n. 



Mdh'. — lilack, thorax and abdomen slightly shining. Frontal and facial 

 orbits silvery, interfront;iH;i mid face grayish ])ruinose. Abdominal mark- 

 ings consisting of a broad deep-black triangle on each segment, the anterior 

 extremity of each triangle ))i-oduced strii)e-like to anterior margin of seg- 

 ment. Legs black. Wings clear. Calyptrae white. Ilalteres with knobs 

 fuscous. 



Ej'es hairy on u])i)er half, separated at narrowest part of frons by a space 

 equal to width across posterior ocelli; cheeks broader than usual, the distance 

 from eye to vibrissa little less than distance between vibrissae; palpi normal. 

 Presutural acrostichals two-rowed. Fore tibia without median bristle, the 

 preajncal dorsal one long. Mid femur hollowed out on ventral surface near 

 apex; antero-dor.sal surface with a closely placed series of short even bristles 

 from base to apex; antero-ventral surface with long, rather closely placed 

 bristles from base to beyond middle, the series becoming shorter from middle 

 to ventral excavation and the last seven to nine duplicated, the excavation 

 bare except near apex where there are five to six short bristles; postero- 

 ventral bristles weaker and fully as long as antero-ventrals; mid tibia dis- 

 torted on basal half, swollen on apical half, the v(>ntral i)ubescenee dense, 

 erect, ;uid at least as long as basal diameter of tibia, dorsal .surface of tibia 

 witli r.ither long setulao, antero-dorsal surface with one long and one short 

 i)ristle, postero-dor.sal surface with two bristles; mid metatarsus with a shar]) 

 spur at base on ventnd surface which is as long as third tarsal joint; hind 

 l''Miur ciiivcd, ;irnic(l Dti anierd-veiitral sui'fac(> with a series of long bristles 



