NORTH AMFJRICAN HYMENOPTERA. 83 



shining below; lateral faces with few transverse rugfe above, closely punctured. 

 Al)domen smooth and shilling, finely and unevenly punctured, slightly im- 

 pressed at base, extreme sides with short spines. Black, pubescence on vertex 

 and mesothorax black, with a brownish reflection, on face, cheeks, pleurte and 

 sides of abdomen, white. Mandibles, except tips, flagelluni, anterior tibise and 

 tarsi, honey yellow. Apical joints of middle and hind tarsi piceous. Wings 

 hyaline, nervures black. Insect very black, even the tegulse and squama. Length 

 5.5 mm. 



Illinois. One male specimen, taken on Slum cicutsefolium on 

 Aug. 8, 1888. 



10. Oxybeltis Cresf^oiiii n. sp. 



9 . — Smooth and shining. Head and thorax coarsely and rather closely punc- 

 tured; prothorax carinate; scutellum slightly, postscutellum more strongly 

 carinate. Spine broad, emarginate at tip ; base of metathorax with few fine lines ; 

 posterior plate smooth. Abdomen smooth and shining, spareely punctured, 

 punctures closer near base of segments, apical segment rough with sparce punc- 

 tures. Black, pubescence on vertex and mesothorax yellow, on face dense and 

 golden. Antennae entirely, mandibles, except tips, tubercles, spot on tegulge, 

 femora at tips, most broadly on anterior pairs, tibiie, except a dark spot in mid- 

 dle, and tarsi, light lemon-yellow. The tarsi paler. Tegulfe testaceous. Wings 

 hyaline, nervures dark. Length 4 mm. 



Illinois. One female specimen, taken July 12, 1887, on flowers of 

 Cicuta maculata. 



Dedicated to Mr. E. T. Cresson. 



11. 0.^ybelus niexicaiiiis n. sp. 



9 . — Densely punctured. Face broad, rather protuberant above ; prothorax 

 carinate ; scutellum and postscutellum with a median longitudinal carina ; squama 

 very short and broad. Spine deeply channeled above, slightly wider at tip and 

 deeply emarginate; base of metathorax with few radiating strise. Abdomen 

 closely and finely punctured, slightly impressed longitudinally at base. Black, 

 legs brownish, pubescence on vertex and mesothorax yellowish, on face silvery. 

 Prothorax involving tubercles, spot on squama, middle femora from tips beneath, 

 fasciae on abdominal segments 1-5 widening on sides of 1st and sometimes 

 slightly interrupted medially, yellow. Mandibles, except tips, flagellum at tip 

 beneath, anterior tibise and tarsi, and tegulse, dull honey -yellow. Apical segment 

 of abdomen rufous. Wings hyaline, nervures brown. Length 7 mm. 



Mexico. One female specimen (coll. Am. Ent. Soc). 



12 Oxybeliis frontalis n. sp. 



9. — Densely punctured. Front of head broad and quadrate, border of eyes 

 straight. Face abruptly receriing from a transverse ridge marked by the summit 

 of scape to the clypens. Middle of face flat; front strongly projecting, the 

 salient portion narrowing below to middle of face ; prothorax carinate ; scutellum 

 and postscutellum longitudinally carinate; squama rounded. Spine narrow, 

 widening above, strongly furcate; base of metathorax with fine radiating lines. 

 Abdomen smooth and shining, finely and closely punctured, base impressed. 



