270 DIPTERA FROM SOUTHWESTERN UNITED STATES 



Type.— d' ; Berkeley Hills, California, April 20, 1908, [A. N. S. 

 No. 6195]. 



This species bears a striking resemblance to the pale variety 

 of Aricia lysinoe Walker which occurs in the west. 



ARICIA R.-D. 

 The characters that are used in the separation of this genus 

 from others in the key on a previous page undoubtedly Hnk to- 

 gether groups of species that are dissimilar in habitus and which 

 are biologically distinct, but the further elucidation of the rela- 

 tionships cannot for various reasons be undertaken in the present 

 paper. 



Aricia latifrontata sp. n. 



Male and female. — Black, shining. Head black, interfrontalia, face, and 

 cheeks brownish, opaque, slightly whitish pruinescent; ocellar triangle shining; 

 orbits subopaque. Thorax with four black dorsal vittae, the spaces between 

 these grayish pruinose. Abdomen with sparse whitish pruinescence on dor- 

 sum, which is most distinct when viewed from behind, forming a central 

 stripe and irregular patches on anterior angles and sides so that each segment 

 appears to have two large subcontiguous irregular black spots. Legs black. 

 Wings slightly grayish. Calyptra white. Knobs of halteres yellow. 



Male. — E}'es bare; frons at vertex one-fourth as wide as head, slightly 

 narrowed at apex of ocellar triangle and widened anteriorly; orbits narrow, 

 each with six to eight strong bristles and a number of long bristly hairs; 

 antennae shorter than face, third joint twice as long as second; arista plumose, 

 the longest hairs at least as long as width of third antennal joint; parafacials 

 in profile a little narrower than third antennal joint, and less than half as wide 

 as height of cheek, the latter with numerous strong marginal bristles of irregu- 

 lar lengths and above them a number of short hairs; vibrissal angle not sharply 

 produced, vibrissa very long and strong, with a few bristly hairs above it; 

 proboscis short and stout; palpi long, slender. Presutural acrostichals repre- 

 sented by six to eight series of short setulose hairs; postsutural dorso-centrals 

 four in number. Abdomen elongate, sHghtly tapered apically; dorsum with 

 strong bristles both on discs and apices of segments; hypopygium small, 

 retracted; fifth sternite with rounded post-marginal excision. Legs stout, 

 strongly bristled; fore tibia with one posterior bristle at middle; mid tibia with 

 two to three anterior, and three to five posterior bristles; hind femur with 

 three to four bristles at apex on postero-ventral surface, the antero-ventral 

 surface with a series of strong bristles from base to apex; hind tibia with four 

 to six antero-ventral, tw^o antero-dorsal, and three to five posterior bristles, 

 the latter weaker than the others and rarely passing beyond middle of tibia, 

 none of them representing the so-called "calcar." Costa with short spinules; 

 costal thorn longer than inner cross-vein; outer cross-vein curved, at more than 

 its own length from apex of fifth vein; veins 3 and 4 very decidedly divergent 

 at apices. 



