320 WILLIAM J. FOX. 



fine and close punctures, the impressed liues on anterior portion strong and ex- 

 tend further than in any of the other species; scntelliim medially impressed; 

 metathorax strongly rugose, the posterior face with large fossiilets, the basal 

 portion of metapleurse smooth, not striated. Abdomen with exceedingly fine 

 and close punctures; black; scape beneath, mandibles, except tips and tubercles, 

 whitish yellow; flagellum not pale beneath ; anterior and middle femora more 

 or less, the tibise and tarsi yellowish testaceous, a spot at base of middle and 

 posterior tibise bright yellow. Wings strongly iridescent, nervures and stigma 

 black. Length 6 mm. 



Beverly, Mass. 



4. Passalcecus inandibularis Cress. 



9- — Front with fine, very dense punctures; vertex also finely punctured, but 

 not so densely as the front; frontal impression not strong; ocelli pitted, the 

 space between the bind pair is, if anything, less than that between them and 

 the nearest eye margin ; third joint of antennte longer than the fourth, the 

 apical joint more than one-third longer than the preceding one; dorsulum very 

 finely and closely punctured, but not so densely as the front, the two longitudinal 

 impressed lines on anterior portion strong, but not foveolate, the lateral margins 

 over the tegulje foveolate; scutellum and postscutellum punctured like the dor- 

 sulum, not impressed; metathorax strongly rugose or rugged, the basal portion 

 of the metapleurse indistinctly striated. Abdomen glabrous, scarcely punctured, 

 black : pectus, front and clypeus with sparse, silvery pile; scape beneath, labrum, 

 mandibles, except tips, tubercles, anterior tiWaB in front, and the base of renuiin- 

 ing tibife, yellowish white. Wings subhyaline, iridescent, nervures and stigma 

 black, sometimes testaceous. Length 6 — 8 mm. 



% . — Front finely granulose, smooth and shining behind the antennse, the im- 

 pressed line faint; ocelli deeply pitted, the anterior one much sn)aller than the 

 others, space between hind pair about equal to that between them and the nearest 

 eye margin ; third antenual joint shorter than the fourth, joints 5 — 9 beneath 

 spinose at tip, the tenth to twelfth incurved, so that they have the appearance 

 of being dentate, eleventh joint not broad nor angular; dorsulum very finely 

 and closely punctured, the impressed lines on anterior portion distinct; scutel- 

 lum very faintly impressed; metathorax strongly rugose, the rugre more com- 

 pact than in any of the other species. Abdomen glabrous, scarcely punctured, 

 black ; scape beneath except apex, mandibles except tips, tubercles, fore tibise in 

 front, and the remaining tibise at base, yellow; apex of femoi-a, four anterior 

 tibiae more or less, and the tarsi testaceous. Wings strongly iridescent, nervures 

 and stigma black. Length 5 — 6.5 mm. 



Colorado ; Nevada ; Mt. Hood, Oregon ; Canada ; Pennsylvania. 

 The eastern specimens are the smallest. P. cui^pidatm Sni., from 

 Hudson's Bay, seems to be closely allied to, if not identical, with 

 this species. 



5. PasNalcecus dispar n. sp. 



%. — Front very finely and densely punctured, the impressed line distinct; 

 ocelli pitted, the space between the hind pair distinctly greater than that be- 

 tween them and the nearest eye margin; third antenual joint as long as the 

 fourth, joints 5 — 8 beneath spinose at the tip, the seventh and eighth indistinctly 



