NORTH AMERICAN HYMENOPTERA. 319 



pectus silvery in cerlain li<;hts; anteiinaj fuscous; scape beneath, mandibles, 

 except apex and tubercles whitish yellow. Legs, except coxae, yellowish testa- 

 ceous, the femora more or less black. Wings hyaline, iridescent, nervures and 

 stigma testaceous. Length 5 mm. 



%. — Form slender; front very finely and densely punctured, the punctures 

 becoming sparse on the vertex; frontal impiessiou strong: ocelli more strongly 

 pitted than the female, the space between the hind pair is distinctly greater than 

 the distance between them and the nearest eye margin ; antennse filiform, reach- 

 ing beyond the tegulje, the joints of the flagellum strongly rounded out beneath, 

 third joint of antenn» much shorter than the fourth, the apical joint about 

 cue-quarter longer than the preceding one; dorsulum as in the female, possibly 

 more finely punctured; scutellum with a distinct medial impressed line; meta- 

 thorax not so strongly rugose as in the other sex, but with a strong medial fur- 

 row on upper surface, the basal portion of the metapleurse smooth and not stri- 

 ated. Abdomen shining, with exceedingly fine and close punctures, veutrally 

 the punctures more distinct; black; mandibles reddish at tip; antennae beneath, 

 except apical joint, tubercles and palpi whitish {sometimes the autennse has the 

 appearance of being ringed with white) the tibise and tarsi entirely and the 

 femora in part, yellow-testaceous. Wings colored as the female. Length 4.5 mm. 



Indiana (Say), Illinois, Massachusetts. I find no groove at tip of 

 abdomen, mentioned by Packard. 



2. Passaloeciis relativiis n. sp. 



% . — Front very finely and densely punctured, the punctures becoming dis- 

 tinct and separated on the vertex ; frontal impression strong; ocelli deeply pitted, 

 the space between the hind pair about equal to that between them and the 

 eye margin : antennae shorter and stouter than in annulatus, scarcely reaching 

 the tegulae, the joints not so strongly rounded out beneath, third joint, if any- 

 thing, a little shorter than the fourth, the apical joint about one-third longer 

 than the preceding one, at any rate it is distinctly more than one-quarter longer ; 

 dorsulum with exceedingly fine and close punctures, the impressed lines on an- 

 terior portion strong, not foveolate ; scutellum not impressed; metathorax 

 strongly rugose, the medial furrow on upper surface not so distinct as in annu- 

 latus, the metapleuife with the basal portion obliquely and finely striated. Ab- 

 domen glabrous, impunctate, black ; scape beneath, mandibles, except tips and 

 tubercles, yellow ; joints 3 — 12 of the antennae beneath whitish on apical portion ; 

 tibiae, tarsi and apex of the four anterior femora reddish yellow, the hind tibiae 

 with a black stripe. Wings strongly iridescent, nervures and stigma black. 

 Length 5 mm. 



Colorado. 



8. Passaloecus distinctiis n. sp. 



% .—Front very finely and densely punctured, the punctures more distinct on 

 the vertex ; frontal impression distinct; ocelli deeply pitted, the space between 

 the hind pair is, if anything, slightly less tiian the distance between them and 

 the nearest eye margin ; thii-d antennal joint slightly shorter than the fourth, 

 the eleventh joint large and broad, somewhat angular, which causes the two 

 following joints to turn backwards; joints 6—8 beneath with a slight spine at 

 apex, joints 7 — 10 beneath incurved or roundly emarginate ; dorsulum with very 



TKANS. AM. ENT. SCO. XIX. DECEMBER, 1892. 



