July 10, 1914 
\_l 0 o' 
Vol. XXVII,' pp. 137-140 
PROCEEDINGS 
OF THK 
BIOLOGICAL SOCIETY OF WASHINGTON 
SYNOPSIS OF THE GENUS PPvOBEZZIA, WITH DESCRIP¬ 
TION OF A NEW SPECIES. 
(Diptera.) 
BY J. R. :\IALLOCH. 
[Published by permission of the State Entomologist of Illinois.] 
The following table includes all the described North American 
species of the genus Prohezzia, and is presented with a view to 
assisting students of Diptera in identifying their specimens. 
The genus belongs to the family Chironomidte, subfamily 
Ceratopogoninte, and is distinguished from Bezzia by the absence 
of femoral spines. 
1. Apex of wing brown, third vein reaching to almost nine-tenths of the 
wing length . . tcv'inincilis Cocpiillett. 
Apex of wing clear . . ...2 
2. Yellow or whitish species . » .3 
Thorax and generally the abdomen black, the former often covered 
with pale i)rninescence . • • d 
.S. Pale yellow, almost white, species, only the last tarsal joint black; 
media sessile . • pallida, n. sp. 
Yellow species; abdomen with brown fasciae on the bases of dorsal 
and black fasciae on apices of ventral segments; legs yellow, apices 
of hind femora, bases of hind tibiae, and apices of all tibiae and of 
all tarsal joints blackened; media petiolate . degantula Johannsen. 
4. Scutellnm yellow .... .5 
vScntellnm concolorous with disc of mesonotnm.7 
5. Large species, 3.75 mm.; media forks proximad of the cross vein 
pachymerxLS Wi 1 listen. 
Smaller species, 2.5 mm. or less; media forks at or beyond the cross 
vein . . 3 
6. Small species, 1 mm.; fifth tarsal joint of hind legs 3 times as long 
as fourth; media forks slightly beyond the cross vein 
incrmis Coq nil lef t. 
Larger species, 2 mm.; fifth tarsal joint of hind legs al)ont twice, as 
long as fourth ; media forks at cross vein . . . glaber CoquiWett. 
31—Proc. Biol. Soc. Wash., Vol. XXVII, 1914. (137) 
