460 AMERICAN HYMENOPTERA. 



ow pile, but usually more or less black in the middle and sometimes 

 with yellow only on the extreme sides ; segment five sometimes mostly 

 black, but usually black in the middle with yellow pile on the extreme 

 sides ; segment six usually entirely or almost entirely black, but often 

 with a little yellow pile on the extreme sides ; segment seven dark. 

 Venter dark in the middle, but usually with considerable yellow hair 

 on the sides. 



Genitalia. — Outer and inner spathse much like those of laboriosus. 

 Claspers much like those of laboriosus (fig. 94). Sagittse like those 

 of variabilis (fig. 97) and laboriosus. 



Wings .—SomevihaX stained with brown ; the fore pair generally 

 darkest in the region beyond the veins. 



Legs. — Mostly black ; the tarsi with more or less ferruginous hair. 



Dimensions. — Length, 10 mm. to 14 mm. Spread of wings, 23 mm. 

 to 30 mm. Width of abdomen at second segment, \\ mm. to 6 mm. 



Habitat. — I have records of this species as follows : British 

 Columbia (Mt. Arrowsmith, Kelowna and Fort Macleod), 

 Alberta (Banff), Saskatchewan (Regina), Washington (Pull- 

 man, Blue Mountains and Ellenburg), Montana (Missoula 

 and Gallatin County), Utah (Logan), Colorado (Pagosa 

 Peak, Ward and Manitou Park) and New Mexico (Magda- 

 lena Mountains). It is probably also present in Oregon, 

 Idaho, Wyoming and northern California. It is mainly a 

 Boreal and Transition species. 



The fact that constdtus and male laboriosus are closely 

 related, as shown by their structure, while insularis and fe- 

 male laborios2is are also closely allied, as also shown by 

 structure, is further strong evidence that consjiltus is the male 

 of insularis. 



Psithyrus bicolor new species. 



Type. — Described from a single female deposited in Prof. 

 T. D. A. Cockerell's private collection. Prof. Cockerell col- 

 lected this specimen at Rociada, New Mexico. 



Much like the female of P. insularis Smith, but with the lower halves 

 of the pleura dark. 



Female. Head.—Yace with a strong touch of yellow pile above the 

 bases of the antennae. Occiput with a large triangular patch of yellow 

 pile. Otherwise mostly dark. Malar space distinctly shorter than 

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

 coarsely punctate. 



Thorax .—Dorsnva mostly covered with yellow pile, but with the disc 



