NORTH AMERICAN flYMENOPTKRA. 241 



extendiiiK back on the occiput; space between the eyes at top about equal to the 

 length of joints 2 and 3 of the antennae; joints 1 — n of the flagelhini strongly 

 rounded out beneath, especially the third and fourth, the first joint shorter than 

 the second; scutellum strongly impressed; furrow on nietanotum as in the 

 female; tibise and tarsi with tolerably sti-ong spines; longer spur of hind tibise 

 shorter than the first joint of the hind tarsi; emargination of eighth ventral 

 plate somewhat angular, black; mandibles castaneous; legs, except coxse, tro- 

 chanters and base of femora, yellow-ferruginous; front, face, clypeus, cheeks 

 and thorax, with dense golden pubescence. Length 12 mm. 



Virginia, Texas. 



7. Tachytt'S coliiinbiiP n. sp. PI. XI. figs. 8, 9, 10. 



9- — Anterior margin of clypeus scarcely produced medially, armed with two 

 short teeth laterally ; mandibles short, stout, obtuse at tip; joints 3 and 4 of the 

 antennae about equal in length; width of the clypeus in the middle (including 

 the production) is but little greater than the distance between the eyes at the 

 top; vertex with rather strong, sparse punctures, parted by a strongly impressed 

 line; region within the ocelli finely punctured with an impressed line. Thorax 

 finely and closely punctured ; scutellum lightly impressed medially; metanotum 

 slightly sulcate, more strongly so basally and apically, finely granulated; tibiae 

 and tarsi strongly spinose; ventral abdominal segments 3 — 6 sparsely punctured, 

 black; mandibles and scape castaneous ; apical portion of the femora, tibiae, ex- 

 cept a dark line within, tarsi, tegulae and nervures, yellow-ferruginous; front, 

 face, clypeus, cheeks, thorax and legs more or less, and the apical margins of 

 segments 1—4 silvery; pygidium golden. Head, thorax, four anterior femora 

 and first segment of abdomen are clothed with grayish pubescence. Length 

 13 mm. 



%. — Anterior margin of clypeus slightly emarginate medially, with two very 

 obscure teeth latei'ally ; third joint of antennae distinctly shorter than the fourth, 

 which is about equal to the fifth ; joints of the flagellum 1 — 7 rounded out be- 

 neath, the sixth and seventh but slightly so ; space between the eyes at top about 

 equal to or possibly a little greater than the length of scape and following joint 

 united; dorsulum and scutelluin finely and closely, but distinctly punctured, 

 the latter strongly impressed medially ; metanotum with a strong furrow, which 

 is broadest at apex; tibiae and tarsi sparsely spinose, seventh dorsal segment 

 tufted laterally with dark hair, eighth ventral with a deep, rounded emargina- 

 tion, four anterior femora in front, except base of medial pair, the apex and 

 apical half of posterior pair, tibiae and tarsi, yellow ferruginous. Length 10 nun. 



District of Columbia and Virginia (Pergande). 



8. Tacliytes crasNus Patt. PI. XI, figs. 11—13. 



9- — Anterior margin of clypeus produced into a short, rounded lobe in the 

 middle and with three rather indistint^t teeth on each side; before the anterior 

 margin there is a transverse depression or furrow ; vertex parted by a distinct 

 furrow, which begins behind the depression back of the ocelli ; first joint of 

 flagellum not one-quarter longer than the second, joints 3 and 4 about equal. 

 Thorax finely and closely punctured, the punctures finer and closer beneath; 

 dorsulum strongly depressed in the middle anteriorly ; scutellum with a slight 

 medial impression; metathorax above with a strong medial sulcus, which is 



TRANS. AM. ENT. SOC. XIX. (31) AUGUST. 1892. 



