66 Proceedings of the Biological Society of Washington. 



Phaonia Robineau Desvoidy. 



Genotype, Phaonia viarum R. D., = Musca erratica Fallen. 

 Differs from both Mydaea and Aricia in having a strong bristle (calcar) 

 on postero-dorsal surface of hind tibia, well beyond middle. 

 There are many North American species. 



Pseudophaonia, gen. nov. 



Genotype, Aricia orichalcea Stein. 



Distinguished from Phaonia by the very conspicuous clump of hairs on 

 center of pteropleura. 

 Monobasic. 



Ariciella, gen. nov. 



Genotype, Ariciella Jiavicornis, sp. n. 



Generic characters. — Eyes closely approximated above; proboscis nor- 

 mal. Prealar bristle absent or minute; hypopleura hairy above in front, 

 and below spiracle; ventral pronotal plate in part hairy. Hind tibial 

 calcar absent. Third vein bare at base, not bent forward at apex. 



Ariciella flavicornis, sp. n. 



Male. — Black, opaque, densely covered with pale gray pruinescence. 

 Antennae, palpi, greater portion of scutellum, legs except tarsi, and the 

 halteres yellowish testaceous. Thorax quadrivittate. Abdomen with 2 

 black spots on third (second visible) and. 2 on fourth segments, central 

 dark line on dorsum indistinct. Wings clear. 



Eyes slightly pubescent, separated above by about the width across 

 posterior ocelli; third antennal joint nearly 5 times as long as wide; 

 arista with very long plumes; cheek about one-eighth as high as eye. 

 Thorax without presutural acrostichals, with 3 pairs of strong postsutural 

 dorso-centrals, and 2 strong intra-alars. Abdomen narrow, slightly 

 ovate. Fore tibia without median bristles; mid femur with 4-5 bristles 

 on basal half of postero-ventral margin ; mid tibia with 2 posterior bristles ; 

 hind femora with 4-5 long bristles on apical half of antero-ventral sur- 

 face ; hind tibia with 2 antero-ventral bristles, and 1, stronger, on antero- 

 dorsal surface; posterior surface with 4-5 setulae, the upper one just 

 about middle. Veins 3 and 4 very conspicuously divergent apically ; 

 outer cross-vein distinctly curved. 



Length, 6.5 mm. 



Type locality, Brownsville, Texas, November 22, 1910 (C. A. Hart). 



Trichophticus Rondani. 



Genotype, Aricia hirsutula Zetterstedt. 



This genus is represented by about half a dozen species in North 

 America. 



I can not find characters that in my opinion warrant the separation of 

 Alloeostylus from this genus. The stouter build of the species of Alloeos- 



