8 AMERICAN HYMEXOPTERA. 



domen ovate, petiole widened somewhat apically, longer than the hind femora. 

 Length 7-8 mm. 



'^. — Face and clypens with dense silvery pubescence; head more finely punc- 

 tured ; antennse elongate, slender, not pale beneath ; dorsulum finely punctured ; 

 mesopleurse finely and closely punctured throughout; middle segment much 

 more coarsely sculptured than in 9, the posterior surface with deep foveae or 

 coarsely reticulated, strongly concave medially so that it presents two convexities, 

 one on each side ; petiole of abdomen distinctly longer than hind femora ; tarsi 

 whitish. Length 6 mm. 



Virginia; Illinois: Algonquin (Nason) ; New Hampshire. 



Psen elongatus Packard, the type specimen of which is a male 

 and not female as described by Packard, does not seem to differ 

 substantially from leucopus. 



8. Psen loiigiooriiis n. sp. 



'^ . — Head rather closely and finely punctured, the front distinctly striated; 

 face and clypeus with dense silvery pubescence ; space between hind ocelli barely 

 equal to half of that between them and eyes; antennae very long, slender, not 

 pale beneath, decidedly longer than head and thorax, joints 2-7 beneath narrowed 

 basally, so that they present a somewhat serrate appearance, first joint nearly 

 twice as long as the second : dorsulum and mesopleurse distinctly striato-punc- 

 tate ; basal triangular enclosure of middle segment large, drawn out apically into 

 a furrow, which runs to apex of posterior face, and with a central smooth area 

 on each side of which are some short rugae; posterior face of middle segment 

 rugoso-reticulate, but little depressed and without lateral ridges ; sides rugosely 

 striated; tarsi, except apical joint, white; abdomen ovate, the petiole slender, 

 longer than hind femur and trochanter united. Length 6.5 mm. 



Florida (Mrs. Slosson). One specimen. 



9. Psen ineliipes Say. 



Psen mellipes Say, Boston Journ. Nat. Hist. i. 369, 9, 1837. 



'■ 9 • — Black, with a silvery reflection ; antetinje at base, tibiae and tarsi piceous. 

 Inhabits Indiana, i/orf.v black ; ftcarZ beneath antennae yellowish silvery ; occiput 

 with a silvery reflection ; antennse to the seventh joint honey-yellow; mandible 

 piceous; thorax with longitudinally confluent punctures, a slender transverse 

 line before, four or six obsolete spots near the scutel and two large obvious ones 

 near the insertion of the petiole of the abdomen ; wings hyaline ; nervures black • 

 stigma brown: second cubital cellule receiving both recurrent nervures ; abdo- 

 men immaculate, with a few hairs towards the tip ; petiole as long as the posterior 

 tarsi, or rather longer, arcuated, piceous; iibise and tarsi piceous or honey-yellow; 

 anterior pair with a dense, short, golden hair. Length nearly eleven-twentieths 

 of an inch." 



% . — Head finely punctured, closely and strongly on the front, which is not 

 striated; face and clypeus with dense silvery pubescence, space between hind 

 ocelli equal to more than half of that between them and eyes ; antennae long and 

 slender, longer than head and thorax, the flagellum, except last joint, yellowish 

 beneath, joints 4-6 prominent beneath, almost dentate; dorsulum with large 

 punctures and fine longitudinal striae : tegulae reddish ; basal enclosure of middle 

 segment drawn out into a furrow at apex, which runs to apex of posterior face. 



