586 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 113 
other described species, although I had previously seen a similar 
male and had labelled it tentatively as a new species. Characters 
other than the male terminalia (see key to the species of Amoebaleria, 
(p. 578)) apparently may be used to separate the aforementioned three 
specimens from all other North American species, except A. caesia 
(Meigen), which may not occur on this continent. Thus I interpret 
the species on the basis of the male specimen determined by Aldrich. 
DistrRIBUTION.—The type female is from Pullman, Wash., 16 Apr. 
1904. The male determined by Aldrich has no data other than the 
number 1205. The other male specimen which I have seen is from 
Solano County, Calif., 1 Apr. 1951 (in the collection of the University 
of California at Davis). 
Amoebaleria spectabilis (Loew) 
FIGURE 83 
Blepharoptera spectabilis Loew, 1859, p. 58; 1862b, p. 128. 
Amoebaleria spectabilis (Loew), Czerny, 1924, p. 134.—Czerny, 1927a, p. 40. 
There is a single male in the U.S. National Museum; it differs 
from any other North American species of Amoebaleria. It is very 
similar to A. caesia (Meigen) except that the humeri are distinctly 
yellowish orange. The distance from the base of the discal cell to 
the anterior crossvein is equal to, or slightly less than, the distance 
from the anterior crossvein to the distal end of the discal cell, meas- 
ured along the fourth longitudinal vein. The terminalia are distinct 
and appear to be very close to Collart’s (1940) illustration of A. 
spectabilis (Loew). The specimen also compares favorably with a 
European specimen which had been determined as A. spectabilis 
(Loew). . 
DisrripuTion.—Large Cave, Tulare County, Calif., 2 July 1952. 
Amoebaleria infuscata, new species 
Figure 85 
This species may be distinguished from related species by the 
presence of clouding on the membrane of the wing along both the 
anterior and posterior crossvein. 
Ma.e.—Front yellow, becoming orange posteriorly; frontal plates, 
ocellar triangle, vertex, and upper half of back of head grayish pol- 
linose; antennae reddish orange, aristae brown; remainder of head 
yellow; anterior fronto-orbital bristle less than one-half the height of 
the posterior bristle; oral vibrissae strong, a single row of buccal 
setae; cheek-eye ratio about 0.5. 
Thorax bluish gray, brownish on pleura and darker on mesonotum; 
humeri concolorous with disk of mesonotum, scutellum slightly yel- 
lowed toward the apex; all dorsocentral bristles about equally strong; 
