280 HYMENOPTERA OF AMERICA. [PART I. 



prinio segmeuto superne flavo, disco nigro ; segmentis 4-6 rufis ; alis 

 fusco-hyalinis. 



Odyn. apical is Cressox, Philad. Ent. Proc. IV, 1865, 161. 



9 . Total length, 6 lines ; expanse of wings, 10 lines. 

 % . Total length, 4.5 lines ; expanse of wings, 7.5 lines. 



9 , Opaque-black. Head and thorax deeply and closely punc- 

 tured, the former broader than the thorax, rather short; a broad 

 transverse band on the front, filling up the sinus of the eyes and 

 deeply indicated above the insertion of each antenna ; the broad 

 posterior orbit and the clypeus, yellow, sometimes strongly tinged 

 with ferruginous, sometimes yellowish at the base; clypeus 

 depressed, rhomboidal, the extreme tip truncate. Antennae 

 black, the two basal joints ferruginous. Thorax: prothorax yel- 

 low above, tipped with dull ferruginous just before the tegulae ; 

 pleura somewhat sericeous, with a large, rounded yellow spot 

 beneath the tegulae; scutellum with two large, quadrate, yellowish 

 marks, nearly confluent ; post-scutelluin yellowish ; metathorax 

 finely aud transversely striated, deeply excavated on the disk, 

 with a large yellowish mark on each side, covering the lateral 

 angles, which are rather prominent and obtuse ; tegulae yellowish, 

 with a ferruginous dot on the middle. Abdomen ovate, basal 

 segment nearly equal in width to the second ; remaining segments 

 gradually tapering to the tip, and more deeply and densely punc- 

 tured than the basal segments; first segments rounded at base 

 without suture or carina, the apical margin confluent, with a 

 large angular mark on each lateral margin, yellowish ; apical 

 margin of the second and third segments (broader on the second 

 segment), yellow; that on the third somewhat tinged with ferru- 

 ginous; remaining segments, above and beneath, dull ferruginous; 

 beneath, the apical margins of the second and third segments are 

 narrowly yellowish, more or less sinuate on each side anteriorly. 

 %. Smaller, the markings of the face tinged with ferruginous; 

 the basal joint of the antennae yellow within, with a black line 

 above, the apical joint ferruginous and hooked; the yellow of 

 the prothorax not continued all the way to the tegulae, being 

 interrupted with black ; fourth segment of abdomen black, with 

 the apical margin above and beneath, "narrowly yellowish ; 

 remaining segments obscure yellowish-ferruginous, more or less 

 dusky at base ; beneath, the second, segment with a yellow spot 



