396 
BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
Antennal scapes with very few erect hairs. .nepticula Wheeler. 
Antennal scapes with numerous erect hairs. . .nevadensis Wheeler. 
Antennal scapes with erect hairs............ 5002s e eee eens 7 
Antennal scapes without erect hairs........-.---..00++++-5 8 
Hairs on antennal scapes coarse and clavate... . impexa Wheeler. 
Hairs on antennal scapes delicate, not clavate. 
microgyna Wheeler. 
Clavate hairs on head, thorax, and gaster rather short. 
microgyna rasilis Wheeler. 
Clavate hairs on head, thorax, and gaster longer. 
microgyna rasilis var. spicata, var. nov. 
EXSECTA GROUP. 
Workers. 
INeanGHGulOEMiGrey. Axes. boc «6 dohslky nag sees OER ee 2 
Palaearetie AGrmis yates « laysisy ¢ ale ce + «x: srarayopeblotendhy Je an rn 6 
Antennal scapes thickened towards their tips...............- 3 
Antennal scapes not thickened towards their tips............ 5 
Posterior. halt ois head, black...........+. ..sakh dee ulket Emery. 
Posterior half.of head-brown. or red..... ..«......+t02 2-3-2 4 
Gaster brown, subopaque or slightly shining. 
ulket var. hebescens, var. nov. 
Gaster black, more opaque and pubescent. 
exsectoides opaciventris Emery. 
Petiole thick and narrow, with sharp but not cultrate border, 
transversely truncated...... exsectoides var. hesperia, var. nov. 
Petiole thin, broad, with a sharp, cultrate border which is not 
transversely truncated 
exsectoides Forel and var. davisi Wheeler. 
Head long, its posterior border deeply excised; body opaque or ~ 
buttieebly she: 2. .aage ts iene eley> aersrel> Heston See 7 
Head shorter, its posterior border less deeply excised; body more 
SUITE We © Eee chs ney. eye stoieyy « AAG suecica Adlerz. 
Clypeus without a transverse impression behind its anterior 
border: amaxilary pala long ....0..[, 6:14). <->: sas 8 
Clypeus with a transverse impression behind its anterior border; 
macisallany smal pa SOE ax ibieia J oreunny type nese eee ieee 10 
