HENRY J. FRANKLIN. 433 



the segments, and sometimes with some yellow hair on the sides at 

 about the middle of the abdomen. 



Genitalia. — Outer spatha (fig. 31) with anterior margin broadly 

 and evenly incurved ; the side margins slightly outcurved ; the hind 

 margin strongly incurved in the middle, thus making the apex ap- 

 pear more or less bilobed ; anterior lateral projections more or less 

 pointed ; ventral surface with short scattered hairs on each side of 

 the apical half. Inner spatha (fig. 134) with sides of anterior margin 

 curved backward ; the side margins irregularly incurved ; the apical 

 portion slightly bilobed, its hind margin being slightly emarginate in 

 the middle; ventral surface of apical portion, on the sides and along 

 the middle line, bearing long, dense, branching hairs. Claspers (figs. 

 86 and 89) with volsellae strongly constricted in the middle, their api- 

 cal projections rather large, pointed and with serrate margins ; outer 

 lobes of squamas much larger than the inner ones, the tips of both 

 lobes rounded. The heads of the sagittse quite broadly foliaceous ; 

 their shafts nearly straight. 



Wi7tgs. — Very much lighter than those of the queen ; without vio- 

 aceous reflections ; at most not darker than light brown. 



Legs. — Coxae usually entirely dark, but sometimes with some yellow 

 pile ; the fore trochanters usually entirely dark and the middle and 

 hind ones also sometimes so, but the middle and hind ones usually 

 with more or less yellow pile on their lower sides ; the fore and middle 

 femora often with some yellow pile ; the hind femora always with con- 

 siderable yellow hair ; fore and middle tibiae entirely black ; hind 

 tibiae with fringes black, the hind fringes being long and the front 

 fringes rather short ; hind fringes of posterior metatarsi long and 

 mostly black ; posterior metatarsi from three and one-half to four 

 times as long as their greatest width. 



Ditnensions . — Length: queen, 17 mm. to 24 mm. ; worker, 12 mm. 

 to 17 mm. ; male, 13 mm. to 21 mm. Spread of wings : queen, 45 

 mm. to 49 mm. ; worker, 29 mm. to 40 mm. ; male, 33 mm. to 40 mm. 

 Width of abdomen at second segment: queen, 11 mm. to 12 mm. ; 

 worker, 6 mm. to 9 mm. ; male, 7 mm. to 9 mm. 



Redescribed from many qeeens (three of them homo- 

 types), five workers (from Utah, Colorado and New Mexico) 

 and six males. 



Variation. — The workers of this species do not, as a rule, 

 have, in all respects, the same coloration as the typical 

 worker described above. I have seen every gradation be- 

 tween the typical worker and the color variant described 

 below, which is the form most commonly met with in col- 

 lections : 



TRANS. AM. ENT. SCO. , XXXVIII. (55) 



