318 Annals Entomological Society of America  [Vol. XIV, 
CC. Subanal plate spinulose, spade-shaped. 
D. Segment VIII with marginals scattered, discal area spinulose, 
sternites thin, chitinous strips attaining the cephalic margin, 
- muscania Meig. 
DD. Segment VIII with marginals bordering the caudal margin, 
discal area smooth, sternites flaring caudad. 
E. Sternites of segment VIII equal in length to the tergites. 
B.’ Ssuranal plate. scoop-shapéd...c0 0.2. caaeen 20s eee parva R. D. 
EE; souranal plate’: hemispheriealeni. cone oie soe cinerella Fl. 
EE. Sternites of segment VIII shorter than the tergites, failing 
to attain the cephalic margin. 
F. Third intersegment smooth, sense organs 4. 
G. Intersegment 4 heavily chitinized, fused to the margin of 
segment VIII, membranes covered with chitinous granu- 
lations es) exes ce ee ie, Aes eee Se ee nee grisella Rond. 
GG. Intersegment 4 hyaline, transparent, membranes thin, 
Aehicatet Fiat hese oh ae ce tee eA ee eee longula Fil, 
FF. Third intersegment smooth on the dorsal surface, spinulose 
on the ventral surface. 
G. Set of the suranal plate approximate, closer together 
than the width of club, accessory pieces absent on 
Sepaaisants: WIL aime WIDE. cog qsmus dodh eno ee flavipennis Stein. 
GG. Setz of the suranal plate the width of the club apart, 
accessory pieces present on segments VI and VII, 
coarctata Fl. 
FFF. Third intersegment partly smooth, partly spinulose on the 
dorsal surface, spinulose on the ventral surface. ..aemene Wlk. 
alcathoe W\k. 
flavicans Stein. 
FFFF. Third intersegment spinulose. 
G. Spinules broad, imbricated, scale-like...... caerulescens Strobl. 
GG. Spinules fine, recurrent, hooklike. 
H. Conjunctiva of segment VIII spinulose......... laevis Stein, 
HH. Conjunctiva of segment VIII smooth. 
I. Tergites of segment VIII undulating. 
J. Cerci short, compact, petiole short, intersegment 
4 smooth, tergites slightly undulating. ..antiqua Meig. 
JJ. Cerci elongate, subcylindrical, petiole slender, inter- ; 
segment 4 spinulose on the dorsal surface, tergites 
markedly undulating \. 420.00 e.202 oe brassice Bouché. 
II. Tergites of segment VIII straight, approximating. 
J. Sternites of segment VIII short, ventral surface of 
iMlbensesment Aasmoouhen: | see eee nuda Strobl. 
JJ. Sternites of segment VIII elongate, attaining two- 
thirds to three-fourths the length of segment, 
ventral surface of intersegment 4 spinulose, 
cilicrura Rond. 
