AMERICAN HYMENOPTERA. 205 



11. tuberculifrons. 



rhi/<iadeuon tuberculifrons, Prov. Nat. Can. vi, p. 28-4, % 9 . 



Hah. — Can., Mass., N. Y. Entirely ferrugiuous except tips of 

 antennae and apex of abdomen, which are more or less black; head 

 unusually large, deeply emarginate behind, cheeks swollen ; antennae 

 with short, robust joints, the basal joints ferruginous, a whitish annu- 

 lus at about the middle; wings narrow, clouded with fuscous, stigma 

 conspicuous; legs rather slender, simple; abdomen fusiform, gastro- 

 coeli obsolete. Length .25 — .30 inch. 



This probably belongs to Genteta-us, Wesm. 



12. helvolus. 



Ichneumon helvolus, Cress. Trans. Am. Ent. Soc. i, p. 312, 9 . 

 Hah. — Ct., Pa., 111. Much like vincibilis, but with narrower abdo- 

 men ; entirely ferruginous except tips of antennae and extreme apex 

 of abdomen which are black ; antennae thickened towards tips, pale at 

 base and with a pale annulus at about the middle ; wings hyaline ; 

 legs subrobust, posterior coxae with a short stout tooth beneath ; 

 abdomen narrow subfusiform, transversely depressed at base of second 

 segment. Length 9 .30 inch. 



13. laevigatus. 



IcJnieumon Isevigutus, Cress. Proc. Ent. Soc. Phil, iii, p. 176, 9 . 

 Hah. — Colorado. A robust, ferruginous species, the flagellum only 

 being black with a broad whitish annulus; metathorax with sharply 

 defined elevated lines and deeply excavated behind; wings hyaline; 

 legs subrobust, posterior coxae with a small acute black tooth beneath ; 

 abdomen fusiform, polished, gastrocoeli very transverse and deep. 

 Length 9 -33 inch. 



14. mellinus. 



Fhijijdilcuon mellinus, Prov. Nat. Can. vii, p. 315, 9 • 

 Hah. — Can., Mass. Same form as vincibilis ; shining ferruginous ; 

 flagellum black with broad white annulus; mandibles, palpi, tegulae 

 and trochanters white ; sutures of thorax black ; metathorax truncate 

 behind, with well defined elevated lines; wings hyaline, iridescent; 

 legs slender, with subrobust femora, posterior coxae with small obtuse 

 tooth beneath; abdomen fusiform, postpetiole broad, gastrocoeli very 

 transverse and deep. Length 9 .25 — .28 inch. 



