542 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 113 
10. 
ie 
13. 
Mesonotum not mottled with many brownish spots or not with a bluish- 
gray color that contrasts with a non-pollinose reddish yellow abdomen; 
sternopleuron usually with only 1 strong bristle ..........7 
. Abdomen reddish yellow, without pollen ..... . . alternans Garrett 
Abdomen pollinose .. . Peo oO 
. Wings completely clear, sah Haren itl fame sallow Browne front brownish. 
grande Darlington 
Wings tinged with faint yellowish brown; front reddish . . wilcoxi Curran 
. Wings hyaline or faintly tinged with yellow! . . . «ak eae RS 
Wing with anterior cells distinctly darkened with blaclaah cmesoneuie with 
evidence of 3 brownish vittae; epiphallic process of male itis short, finger- 
like posteroventral apex ... . . . . . fumipenne, new species 
Posterior ventral apex of male epineallic process extended into a fingerlike 
portion which is at least twice as long as wide ... . 5. 6 yell sane 
Posterior ventral apex of male epiphallic process not pxfended into such a 
fingerlike portion .... Bete 6 oll 
Two strong mesopleural pmctles: Sar 5 raeuniaree rows of Berne between the 
dorsocentral bristles... . . . . jamesi, new species 
One strong mesopleural bristle; about 7 a 3 eens rows of scattered setae 
between the dorsocentral priailes Seas iia Ree eg LO) 
Middle tibia of male with hairs as long as the dorsal mreanical bristle; epand- 
rium of male with hairs as long as the length of the surstylus. 
longipile, new species 
Middle tibia of male without hairs as long as the dorsal preapical bristle; 
epandrium of male with hairs shorter than length of surstylus. 
cerbona Curran 
Epiphallic process of male with conspicuous, well-differentiated spines along 
posterior surface; ventral edge with a distinct notch . . . currani Garrett 
Epiphallic process of male without well-differentiated spines along posterior 
margin; ventral edge with a slight inward curve, but no distinct notch . 12 
. Surstylus of male ea than wide; mesonotum yellow to yellowish 
Oran vehr al ee. pace ooo ls: 
Surstylus of male Aer as Thisitter as ees raeeonctean variable in color, but 
with a grayish or silvery pollinosity . . . Sal 
Epiphallie process of male slightly extended posterov ertnaliy penerel body 
coloration yellowish orange... . . . . . « lutescens Curran 
Epiphallie process of male with mecha? no Saailiention of a posteroventral 
extension; general body coloration pale yellow. . . marginatum Loew 
1 Of the remaining species, A. carbona Curran, A. lufescens Curran, and A. currani Garrett were described 
from males only, and females are poorly or not at all known; thus the remainder of this key is inadequate 
for determining females. 
Ficures 41-55.—Structures of the terminalia of Anorostoma. All views are lateral, except 
those of figs. 53-55, which are dorsal. Figs. 41-52, left epiphallic processes and surstyli, 
X 25: 41, Anorostoma maculatum Darlington; 42, 4. grande Darlington; 43, 4. alternans 
Garrett; 44, 4. marginatum Loew; 45, A. coloradense Garrett; 46, A. lutescens Curran; 
47, A. jerset Garrett; 48, 4. currani Garrett; 49, 4. carbona Curran; 50, 4. longipile, 
new species; 51, 4. fumipenne, new species; 52, 4. jamset, new species. Figs. 53-55, 
tip of abdomen of female, X 50: 53, 4. marginatum Loew; 54, A. coloradense Garrett; 55, 
A. jersei Garrett. 
