64 BULLETIN 45, UNITED STATES NATIONAL MUSEUM. 



the termination of the mesonotal grooves. Mesopleura finely, microscop- 

 ically sculptured, with a rounded impression or fovea at the middle. 

 Metathorax quadrate, truncate behind, the margins delicately keeled 

 and a delicate longitudinal keel down the center, the disk toward the 

 base delicately longitudinally wrinkled; on each side, between the 

 wrinkled portion and the lateral margins, is a smoother si)ace that 

 exhibits a minutely transverse strigose sculpture; the truncature is a 

 little depressed in the middle and with a delicate median keel. Legs 

 black ; the tibia* and tarsi are rather densely covered with a brownish 

 pubescence and in consequence appear brown. Abdomen black, pol- 

 ished, the second segment the longest. Wings hyaline, veins brown; 

 the second basal cell is half the length of the basal nervure longer 

 than the first, the radius very long, as long as the second basal cell. 



Habitat. — Wales Canyon, Colorado. 



Type i in Coll. Ashmead. 



Described from a single specimen, received from T. D. A. Cockerell. 



Mesitius vancouverensis sp. nov. 

 (PL IV, Fig. 5, 9.) 



9 . Length 6.4™™. Black, shining, impunctured, except a few small 

 scattered punctures on the head and thorax. Head oval, 1^ times as 

 long as wide. Mandibles and i^alpi rufous; the large outer tooth black. 

 Antennaj 13-jointed, acuminate at tips, extending to base of meta- 

 thorax, the flagellar joints after the first all longer than thick, the first 

 about equal with the pedicel, not, or scarcely, longer than thick. Pro- 

 thorax very long, three times t\\e length of the mesonotum, the latter 

 with 2 parallel furrows, faint anteriorly, more deeply impressed posteri- 

 orly; scutellum with 2 foveie at base directly opposite the mesonotal 

 lines; metathorax almost smooth, quadrate; there is a median longitu- 

 dinal carina extending to the apex and the surface on each side is finely 

 sculptured. Teguhe pale rufous. Wings subfuscous, the venation 

 brown; the stigmal vein is very long, almost forming a closed riidial 

 cell; the transverse medial nervure is strongly angularly curved, so 

 that its apex is parallel with the apex of the basal nervure. Legs 

 black, the tibij^B and tarsi dark rufous. Abdomen ovate, shorter but 

 wider than the thorax, black and shining, with the extreme ax^ical edges 

 of the segments tinged with rufous, sparsely pilose. 



Habitat. — Vancouver Island. 



Type 9 in Coll. Ashmead. 



Described from a single specimen received from W. Hague Harring- 

 ton. 



Mesitius nevadeusis sj). nov. 



9 . Length 0""". Very close to M. vancouverensis, but differs as fol- 

 lows : The legs, except the front coxae and femora, are rufous, the mid- 

 dle and posterior femora rufo-piceous ; mandibles terminating in a 



