272 DIPTERA FROM SOUTHWESTERN UNITED STATES 



Frons slightly more than one-third the width of head at vertex, broader 

 anteriorly; longest hairs bn arista equal to basal diameter of arista; cheeks 

 one-fourth as high as eye. Presutural acrostichals weak, irregularly four 

 rowed; postsutural forso-centrals three; sternopleurals 2:2. Fore tibia un- 

 armed at middle; mid tibia with two to three posterior bristles; hind femur 

 with three to five strong bristles on apical half of antero-ventral surface; hind 

 til)ia with two to three weak antero-ventral bristles, and one strong one at 

 middle on antero-dorsal surface. Costal thorn longer than inner cro.ss-vein. 

 Length, 5.25 to 6 mm. 



Type.— 9 ; Cloudcroft, New Mexico, May 21, 1902, [A. N. S. 

 No. 6197]. Paratype.—l 9 , topotypical, May 23, 1902. 



Closely allied to ohscurinervis Stein, but that species has one 

 to two bristles on the fore tibia, the hind femora with a strong 

 bristle near middle of the postero- ventral surface, and the longest 

 hairs of the arista equal in length to width of third antennal 

 joint. 



Aricia lysinoe Walker 



1849. Anthomyia lyino'e Walker, List, iv, 938. 



I have a large number of specimens of this species from many 

 localities in the United States, and after careful study of Stein's 

 types I have concluded that lysinoe Walker, amoeba Stein, and 

 pubiceps Stein are ail one species. It is possible that fulviventris 

 Bigot is also a synonym. 



The species varies in color from black, with apex of scutellum 

 fulvous (pubiceps) to entirely fulvous (fulviventris?) . The abdo- 

 men is pale at base in amoeba, type-specimen, but along with the 

 type are some Idaho specimens which have the thorax and abdo- 

 men fulvous with one to two pairs of fuscous spots on dorsum of 

 abdomen. This pale form I have seen only from the west, Idaho 

 and Oregon, and there is one specimen of it in the present col- 

 lection taken in the Yosemite ValleA^, California, May 22, 1908. 



XENARICIA gen. n. 



Generic characters. — Eyes bare, almost contiguous above in 

 male, with a flattened area above on which the facets are very 

 much enlarged, about five times as large as those on the lower 

 half of eye; eyes of female widely separated, the frontal chaeto- 

 taxy as in Phaonia; arista plumose; proboscis short and stout. 

 Prealar bristle absent; hypopleura bare. Fifth abdominal ster- 

 nite of male with a very large, deep U-shaped posterior excision; 



