232 U. S. NATIONAL MUSEUM BULLETIN 216 



Howden (Townes). d" , 4 miles northwest of Dunnellon, Fla., Aug. 3, 

 1938, Hubbcll and Friauf (Ann Arbor). 9, Iowa, Aug. 21, 1935, 

 H. E. Jacques (Washington). d\ Takoma Park, Md., July 6, 1944, 

 H. Townes (Washington). d\ Martha's Vineyard, Mass., F. M. 

 Jones (Townes). 9, Allegheny Co., Pa., June (Pittsburgh). 9, 

 Allegheny Co., Pa., "Aug. 8-14," H. Kahl (Pittsburgh). 9, in light 

 trap, Fort Thompson, S. Dak., Aug. 12, 1943, D. T. Murdock 

 (Townes). 9 (type), Texas (Washington). 9, G. W. Belfrage 

 (Townes). 9, Aug. 19, 1892 (Washington). 



This species is widely distributed from Pennsylvania to Florida, 

 west to South Dakota and Texas, but is scarce in collections. The 

 pale color, large ocelli of the female and the fact that one female was 

 caught in a light trap indicate that this sex at least may fly at night. 



32. Exochus mesorufus, new species 



Figures 189,s; 194,d 



Front wing 3.8 to 4.9 mm. long; combined face and clypeus about 

 1.18 as high as wide in male, about 1.15 as high as wide in female, 

 moderately and evenly convex in the vertical and horizontal planes 

 except that the clypeus in profile bulges weakly; punctures of face and 

 clypeus moderate in size and strength, on face separated by about 0.5 

 their diameter, on clypeus much sparser; apical angle of interantennal 

 process about 100 degrees; median swelling of frons weak, laterally 

 not differentiated ; hind ocellus separated from margin of eye by about 

 0.75 its long diameter in male, by about 0.95 its long diameter in 

 female ; median half of apical margin of clypeus truncate or faintly con- 

 cave; mandible broad, with small, rather sparse punctures, rather 

 evenly tapered to its moderately broad apex, its lower tooth small; 

 costula incomplete or medially weak ; second lateral area of propodeum 

 with a very few hairs basally or laterally ; areola bounded laterally by 

 rather weak and narrow carinae; hind femur about 2.40 as long as deep 

 in male, about 2.17 as long as deep in female; front spur of hind tibia 

 about 3.1 as long as wide in male, about 3.2 as long as wide in female; 

 punctures of second abdominal tergite small, not deep, medially absent 

 or very sparse, sublaterally separated by about twice their diameter. 



Male: Black. Face, narrow orbital line on lower half of frons, 

 triangular spot at top of eye, cheek, adjacent temple, clypeus, mouth 

 parts, lower 0.3 of propleurum, upper margin of pronotum from epomia 

 to apex (widened posteriorly), lower corner of pronotum, tegula, sub- 

 tegular ridge, narrow apex and sides of scutellum, narrow transverse 

 mark on postscutellum, upper part of prepectus, mesopleurum nar- 

 rowly next to its coxa, and front and middle legs, ivory white; antenna 

 blackish brown, brown below, the under side of scape white; meso- 

 sternum except for its median groove and mesopleurum except dorsally 



