324 AMERICAN HYMENOPTKRA. 



yellow to the bases of the legs ; metapleura clothed with yellow pile ; 

 sides of median segment usually with dark and yellow pile mixed. 



Abdomen. — Dorsum : segment one yellow; segments two and three 

 black ; segment four yellow, but often with some black hairs in the 

 very middle ; segment five with considerable black pile in the middle, 

 this very often sprinkling out somewhat strongly through the yellow 

 pile on the sides; segment six dark. Venter largely dark, but with 

 the sides of the apical margins of the second to the fifth segments in- 

 clusive fringed more or less heavily with yellow hairs ; the middle por- 

 tion of the apical margin of the first segment also often with a yellow 

 fringe. Hypopygium without a median carina. 



JFi«^5.— Somewhat stained with brown ; the fore pair darkest along 

 the costal border. 



Legs. — Fore and middle coxee mostly dark ; hind coxae with some 

 yellow hairs on their outer sides ; fore trochanters mostly dark ; mid- 

 dle and hind trochanters with considerable yellow pile on their lower 

 sides ; fore femora sometimes with a few yellow hairs on their lower 

 sides ; middle femora sometimes entirely dark and sometimes with 

 considerable yellow pile on their lower sides ; hind femora always with 

 more or less yellow hair and sometime with more yellow than black ; 

 fore and middle tibiae and corbicular fringes dark. 



Worker. — Much like the queen, but often with a strong admixture 

 of black hairs with the yellow on the front part of the dorsum of the 

 thorax ; middle trochanters and hind femora occasionally entirely dark 

 and the hind trochanters sometimes with only a very little yellow pile ; 

 the metapleura sometimes with considerable dark pile and the sides of 

 the median segment occasionally entirely dark. 



Male. — Face and occiput largely covered with pure yellow pile ; 

 cheeks with much yellow pile, usually connecting with the yellow on 

 the occiput. Malar space longer than its width at the apex, nearly 

 one-fourth as long as the eye. Clypeus mostly covered up with yellow 

 pile. Flagellum of antenna nearly three and one-third times as long 

 as the scape ; third antennal segment somewhat shorter than the fifth, 

 the fourth shorter than the third. 



7"Aorfl;tr.— Coloration much like that of the queen and worker, but 

 the black interalar band usually distinctly narrower. 



Abdomen. — Dorsum : segment one yellow ; segment two usually 

 mostly black, but its basal middle usually with more or less yellow pile, 

 this pile sometimes extending to the hind margin of the segment ; seg- 

 ment three black ; segment four yellow, but usually with a little black 

 pile in the very middle ; segment five like segment four, but usually 

 with more black pile in the middle ; segments six and seven black. 

 Venter, except at the base, clothed mostly with yellow pile. 



Genitalia. — Outer spatha much like that of vagaris {^%. 131). Inner 

 spatha much like that of impatiens (fig. 133). Claspers (figs. 74 and 

 110) with inner sides of the ends of the branches rather sharply pointed 

 as viewed from above ; the volsellse with prominent apical projections. 



