1910] fifties, North American Parasitic Hymenoptera IX. 75 



Thorax nearly three times as long as wide. Collar prominent, but 

 the pronotum very indistinctly separated from the mesonotum. Meso- 

 notnm one-half longer than broad; its lateral sv.ture distinct only pos- 

 teriorly. Teguhc indicated by minute tubercles. Scutelhim not at all 

 indicated. Surface of thorax above shagreened. more shining on the 

 metathorax. Upper face of metathorax evenly convex, its posterior 

 slope margined by a sinuous transverse carina which extends down the 

 sides to the insertion of the posterior coxa ; near each posterior angle 

 is the vestige of another oblique carina, faintly indicating a small 

 areola close to the coxa. No lateral carina. Abdomen nearly twice 

 as long as the thorax, petiole broadly dilated, three times as broad at 

 the tip as at the base, its sides straight, without the slightest indica- 

 tion of spiracular tubercles or teeth. Above on the sides with a com- 

 plete longitudinal carina including the spiracle and below on the sides 

 with a second carina. Petiole shagreened, but the remainder of the 

 abdomen smooth and polished, its hairs sparsely placed : second seg- 

 ment slightly longer than the third: fourth and tilth growing shorter. 

 Ovipositor as long as the abdominal petiole. Legs with the femora 

 stout, especially the four anterior ones. Longer spur of posterior tibia 

 slightly over one third as long as the metatarsus. 



Mount Constitution, San Juan Co., Washington, July kjoS. 

 A. L. Melander. 



Pezomachus delumbis sp. nov. 



Female. Length ."> mm. A slender species with elongate legs and 

 antenna?. Head slightly over twice as broad as thick, the occiput an- 

 gularly excavated, but less strongly so than in P. insotens; ocelli in a 

 triangle, the lateral ones farther from the eye-margin than from the 

 median ocellus. Head above subopaque and shagreened. Front at nar- 

 rowest part above the antenna? one half wider than either eye. Malar 

 space as long as half the width of the front, with an indistinctly 

 marked furrow from the eye to the base of the mandible. Clypeus 

 with a, large fovea at each side, weakly convex, with scattered punc- 

 tures: its upper margin far oelow the level of the lower margins of the 

 eyes. Checks smooth and polished. Pronotum indistinctly separated 

 from the mesonotum, mesonotum nearly twice as long as wide, the 

 scutellnm indicated by a distinct transverse depressed line. Tegula? 

 visible as small tubercles, just inside of which the lateral margin of 

 the mesonotum is indicated by a grooved line which extends along only 

 the posterior third. Entire thorax above subapaque, shagreened. the 



