394 
12. 
15. 
14. 
15. 
16. 
ep 
18. 
ae. 
BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
Mesonotum ammaclate ss) ti. ae dakotensis Emery. 
Mesonotum with three dark spots. 
dakotensis var. montigena Wheeler. 
Gaster very smooth and shining, with very short, sparse, indis- 
tinct pubescence eee 2 fol). e LT ns 14 
Gaster opaque or subopaque, with denser, longer pubescence. . 16 
Length 7-S mm. Head and thorax deep red, the former not 
infuscated. Wings deeply infuscated at the base. 
truncicola obscurwentris Mayr. 
Length 8-9 mm. Head and thorax dull, yellowish red, both 
more or less infuscated. Wings only slightly infuscated....15 
Posterior border of pronotum infuscated. 
rufa aggerans, nom. nov. 
Pronotum and other portions of thorax more extensively infus- 
Cate OE aa Ness: rufa aggerans var. melanotica Emery. 
Head and thorax without erect hairs above................. 17 
Head*and thorax with erect hairs above... 27.0 22 eee 19 
Length 6.5-8 mm. Ground color of head, thorax, and petiole 
sordid brownish yellow, gaster blackish brown, not paler at 
(Ne Deseret ee ee ee kk truncicola mucescens, subsp. nov. 
Length 8-10 mm. Ground color of head, thorax, and petiole 
bright or deep red, base of gaster red. °°). 5.) Magee 18 
Pubescence on gaster rather sparse and short, so that its surface 
is subopaque. . truncicola integroides var. haemorrhoidalis Emery. 
Pubescence on gaster longer and denser so that its surface is more 
OP AUUC MOREE oe Gla ge la es truncicola integra Nyl. 
Hairs on upper surface of head and thorax sparse; wings opaque 
LANA re eee Oe ns truncicola integroides Emery. 
Hairs on upper surface of head and thorax somewhat more abun- 
dant; wings distinctly infuscated at the base. 
truncicola integroides var. coloradensis, var. nov. 
MIcROGYNA GROUP. 
Workers. 
Gaster shining, very sparsely and finely pubescent............ 2 
Gaster opaque, densely pubescent...) .. 2... Ss. a eee 3 
Head and thorax deep red, gaster black... .. nepticula Wheeler. 
Head and thorax reddish yellow, gaster brown. .morsei Wheeler. 
