446 AMERICAN HYMENOPTERA. 



shade. In some specimens it is very pale straw yellow, 

 while in others it is light golden. The ferruginous pile also 

 varies greatly in shade, in many specimens being quite pale 

 while in some it is almost wine color. 



Boiiibus (Boiiil)ias) liensliawi new species. 

 Types. — Described from two queens (cotypes) from San 

 Francisco and Palo Alto, California, one of which is deposited 

 in the collection of the Museum of Comparative Zoology at 

 Cambridge and the other in the collection of Leland Stan- 

 ford Jr. University. 



Pile of mediuin length and texture. Face dark ; occiput with yellow 

 pile ; dorsum of thorax entirely covered with yellow pile, except for a 

 black band between the bases of the wings ; pleura mostly dark ; abdo- 

 men dark, except for the fourth and fifth dorsal segments bearing yellow 

 pile ; legs dark; wings not very deeply stained with brown. Malar 

 space short. 



Queen. Head. — Face entirely dark ; occiput with a triangular patch 

 of yellow pile ; cheeks dark. Labrum with tubercle-like areas having 

 their margins rounded and summits flat or slightly concave ; shelf-like 

 projection wide and prominent. Malar space distinctly shorter than 

 its width at apex, about one-sixth as long as the eye. Clypeus rather 

 sparsely and delicately punctate over the disc. Ocelli not much below 

 the supra-orbital line. Flagellum of antenna about one and two-thirds 

 times as long as the scape ; third antennal segment much longer than 

 the fifth, almost equal to the fourth and fifth taken together, the fifth 

 somewhat longer than the fourth. 



77/ora.r.— Dorsum, except for a well defined black interalar band, 

 entirely covered with light yellow pile ; the yellow on the anterior 

 part extending down onto the sides to somewhat below the level of the 

 bases of the wings. The center of the disc bare and smooth. The 

 mesopleura mostly, and the metapleura and sides of the median seg- 

 ment entirely, dark. 



Abdomen. — Dorsum : first three segments entirely covered with black 

 pile ; fourth segment covered with yellow pile ; fifth segment mostly 

 covered with yellow pile, but with a small amount of black hair in the 

 middle; sixth segment dark. Venter dark. Hypopygium with a me- 

 dian carina on its apical portion. 



Wings. — Not very deeply stained with brown ; the fore pair lightest 

 in the region beyond the veins. 



Legs. — Coxae, trochanters, femora and tibiae, including corbicular 

 fringes, dark. 



Dimensions. — Length, 15 mm. ; spread of wings, 35 mm. ; width of 

 abdomen at second segment, about 8| mm. 



