NORTH AMERICAN HYMENOPTERA. 311 



strongly spiuose limn in either of the two preceding species ; petiole of iihdonien 

 fully as long as the first joint of the hind tarsi; abdomen shining with very 

 sparse and fine punctnres, the apical segment abo%e broadly channeled, the chan- 

 nel deepest basally and becomes almost obliterated at the apex; black, rather 

 densely clothed with pale hair. Wings subhyaline, nervures and stigma vary- 

 ing from testaceous to black. Length 8 — 9 mm. 



% .—Anterior margin of clypeus emarginate medially, but not widely so in the 

 two preceding species; sculpture of front hidden by the dense fuscous hair, but 

 is probably densely and coarsely punctured ; top of head and cheeks punctured 

 like the female; head from above much more narrowed Ijehind than in the 

 female, not by any means twice as broad as it is long in the middle : antenuse 

 short, not reaching beyond the collar, thii-d joint about one-quarter longer than 

 the fourth, joints 3-8 of the flagellum more or less angular or denticulate beneath ; 

 dorsulum and scutellum scarcely wrinkled, the punctures distinct ; metathorax 

 as in the female; tibia; not spinose; first joint of medial tarsi greatly thickened 

 to the apex, presenting a club-shaped appearance; petiole of abdomen nearly as 

 long as the first and second joints of the hiud tarsi combined ; colored like fe- 

 male, except that the apical margins of ventral abdominal segments 2-5 are 

 whitish; clypeus silvery. Length 7— 9 mm. 



California : San Mateo County (March, April), Monterey County 

 (April), Placer County (September). Dedicated to Prof. C. V. 

 Riley. 



4. Penipliredon coiirertiin n. sp. 



-j^—Very close to EileyU but differs as follows: the anterior margin of the 

 clypeus is broadly emarginate; dorsulum without any trace of wrinkles, with 

 large, sparse punctures, the anterior portion with a wide foveolate furrow in the 

 middle; enclosed space on metanotum strongly depressed or excavated on basal 

 half, this portion is longitudinally ridged or striated, the apical half smooth, a 

 strong medial channel extends from its base to apex ; first joint of middle tarsi 

 more elongate, the apex not so thick ; petiole of abdomen about as long or a little 

 longer than the first joint of the hind tarsi ; pubescence not so dense; ventral 

 abdominal segments entirely black. Length 11 mm. 



One specimen ; Easton, State of Washington (Koebele). This 

 species and Eileyi are from the collection of the United States Nat'l 

 Museum. 



5. Peiuphredon nearcticus Kohl. 



9 .—Anterior margin of the clypeus in the middle with two strong emargina- 

 tions, or strongly tridentate; front with strong, close punctures, but they are 

 not so dense as in Rileyi or confertim ; punctures on top of head very sparse, even 

 more so on the cheeks. Head from above nearly quadrate, very slightly nar- 

 rowed behind; third joint of anteuure fully one-third longer than the fourth ; 

 dorsulum anteriorly strongly and closely punctured, posteriorly the punctures 

 are larger and sparse; scutellum with large, sparse punctures; enclosure on 

 metanotum longitudinally striated ; the striaj not attaining the apex, channeled 

 medially, the posterior face finely punctato-rugose ; tibije rather strongly spinose : 

 petiole of abdomen slightly shorter than the first joint of bind tarsi, its upper 

 surface concave. Abdomen shining, with very fine and sparse punctures, the 



TRANS. AM. ENT. SOC. XIX. DECEMBEK, 1892. 



