E. T. CRESSOX, JR. 
OO 
in the tarsal fascicle, which in the male is a very long bristle, more 
than a half as long as the basal joint. 
I have not seen the type of this species. 
Description. — Similar to olivacea. Smaller (3 to 4 mm.); frontal vittae 
sometimes narrow or may be obscured; arista with eight to ten hairs. Tarsal 
fascicle with black bristle, which of the male is very long, more than half as 
long as basal joint of tarsi; of female not longer than the accompanying yellow 
bristles, but is situated more on the inner than flexor side of the joint, and is 
sometimes difficult to see. Wings hyaline, clear, not yellow tinged; second 
costal section twice as long as third. 
Type. — cf ; Texas, (Belfrage), [Mus. Comp. Zoology ?]. 
Specimens Examined. — 4 cf, 12 9. 
South Dakota: Brookings, 1 cf, 1 9, [Aldrich]. 
Kansas: Clay County, 1 9 , [C. U.j. 
Texas: Austin?, X, 1899, 1 cf , [Wash.]. Plano, (E. S. Tucker; at night), 
1 9, [Ivans.]. Galveston, V, (F. H. Snow), 1 cf , 3 9, [Kans.]. 
Arizona: Bill Williams Fork, VIII, (F. H. Snow), 1 9, [Kans.]. 
California: Coalinga, Fresno County, VI, 1 to 3, 1907, (J. C. Bradley), 
1 9, [C. U.]. Mesa Grande, Russian River, IX, 30, 1906, (J. C. Bradley), 
2 9 , [C. U.]. Stanford University, X, 1 cf, 1 9, [S. U.]. Visalia, (Culbert- 
son), 1 9 , [Aldrich]. 
The species seems to be limited to the states west of the 
]\Iississippi River. 
The pulchrifrons-^vowp . 
A seemingly well-defined group, although based primarily on 
the color pattern, which consists of distinct frontal and mesonotal 
stripes. Those of the frons, especially, are sometimes velvety 
black, contrasting beautifully with the gray or yellowish tinged 
orbits and triangle. I know only the following three species, 
which are not entirely satisfactory, and the studj^ of more mate- 
rial may reduce these to two or even one. The group may then 
prove to be untenable. 
Xotiphlla pulchrifrons Loew 
1878. Notiphila pulchrifrons Loew, Berk, Ent. Zeit., xvi, 102 (Cent, x, 84). 
This species, although not so distinctly marked as the others, 
however, possesses the group characters. It is readily distin- 
guished from the others by the third antennal joint, middle and 
hind tibiae being yellowish; also by the vittation which is more 
subdued, not so intensely black on the frons, and the abdominal 
markings are sometimes reduced to two series of spots. 
I do not doubt my determination of this species. 
TRANS. AM. ENT. SOC., XLIII. 
