J. R. MALLOCH 307 



only; antennae reaching almost to incnith margin, third joint twice as long as 

 second; arista with the longest hairs slighth' shorter than width of third an- 

 tennal joint; parafacials in profile slightlj- less than width of third antenna! 

 joint and less than half as wide as height of cheek, the latter with one to two 

 series of marginal bristles; vibrissa above lower level of cheek. Thorax with 

 three to four pairs of widely separated presutural acrostichals, between whic'i 

 there are no w^eak hairs; prealar bristle over one-third as long as the bristle 

 behind it. Abdomen slightly flattened; fifth sternite with a i)air of sliort, 

 broad, apically truncated processes, the lower margins of which are armed v.ith 

 very closely placed, fine, short hairs, the apex less densely fringed; hypopygium 

 rather large for a species of this genus, the sixth abdominal segment glossy 

 black, contrasting sharply with the basal segment of hypopygium, both of 

 them with long, strong bristles. Legs stout; fore tibia with one antero-dorsal 

 and one postero-ventral l)ristle; mid femur with two to three short, weak 

 bristles near base of postero-ventral surface; mid tibia with one antero-dorsal, 

 two postero-dorsal, and two postero-ventral bristles; mid tarsus distinctly 

 shorter than mid tibia; mid femur with four to six strong bristles on antero- 

 ventral surface, the longest and strongest one near middle, the postero-ventral 

 surface with one to two short, stout bristles near middle; hind tibia with two 

 short antero-ventral, four unecjual antero-dorsal, and three strong postero- 

 dorsal brLstles, po.sterior surf ace with an irregular series of six to nine short, erect, 

 setulose hairs on basal half; hind tarsus very little shorter than hind tibia. 

 Costal thorn very short; apex of wing rather acute, third vein ending almost 

 in tip, fourth vein ending almost as far l)ehind tip as second does in frt)nt of it. 

 Length, 6 mm. 



Type.— d'; Yosemite Valley, California, May 22, 1908, [A. 

 N. S. 6214]. 



This species differs from others with pale legs known to me in 

 having three infuscated areas on wings, in structure of the fifth 

 abdominal sternite, and in chaetotax}' of the legs. 



Hylemyia alcathoe Walker 



ISU). Antliouiijifi nhathoe Walker, List, iv, 937. 



There arc nineteen specimens of this species in the collection 

 as follows: two males, Redwood Canon, ]\Iarin County, California, 

 May 17, 1908; three males, Lagunitas Canon, ]\Iarin County, 

 California, March 29, 1908; two males and two females, Yosemite 

 Valley, California, :May 22, 1908; four males, Berkeley Hills, 

 California, March 22, 1908; two females, same localit}', April 20, 

 1908; two females, Mesa Grande, Sonoma County, California, 

 May, 1908, (J. P. Baumberger); one female, same locality, Jime, 

 1908; one male, San Francisco, California, March 30, 1908, (F. E. 

 Blaisdell). 



TRANS. AM. ENT. SOC, XLIV. 



