52 HYMENOPTERA OF AMERICA. [ PART I. 



having a very small groove, strongly striated transversely or 

 rather channelled in all its superior and posterior surface (situated 

 above the lateral ridges). Some striae, but less distinct, also 

 cover entirely the lateral faces of the metathorax, beneath the 

 angles. Enlargement of the petiole in an oval form, much 

 lengthened, depressed, without any globular swelling above; its 

 linear portion short, equal to a third the length of the petiole, 

 ■ tli, .-Inning, without punctures. The posterior depression 

 not having an excavated point, bul a transverse shining channel. 

 d segment much lengthened, pediculate ; its pedicle form- 

 ing almosl the moiety of the length of the segment, which oilers 

 a /.on.- of line punctures along its posterior border; the second 

 lamina of this margin a little reflected. The whole insect is 

 :ed with a tawny pile almost woolly on the thorax, gray on 

 the metathorax, a little golden on the abdomen, but the body is 

 polished and shining, especially the petiole, which does not show 

 any punctures. 



Color black; antenna' ferruginous beneath, obscure above 

 Two dots on the face, two spots on the metathorax and often the 

 post-scutel and the margin of tin; prothorax, yellow or tawny. 

 Petiole having a yellow interrupted border; the abdominal 

 - wholly or in part margined with a very narrow yellow 

 line. Feel Mack. Tibiae yellow before. Wings transparent, 

 washed with yellowish-gray. 



//■ ss. n. diff. — This species appears to me very near to Z. 

 tubulifer. It may even he identical; which 1 dare not say posi- 

 tively, not having the ty] f this last before my eyes, and being 



without a sufficient description. 



Ii is very recognizable by its back as well as its petiole, being 

 without punctures and shining. The Z. Ghicotencatl is not diffi- 

 cult to distinguish from the Z. Matzicatzin, by its metathorax, 

 rugose even to the summit and without middle carinae, by its post- 

 scutel, which is not notched behind, by its much less enlarged 

 petiole, by the border of ils second segment, which is punctured, 

 and by the second lamina of its border, which is turned up ; per- 

 haps also by ils thorax, which is not cribrose, and by the ocelli, 

 which occupy the summit of the vertex. 



ll'iU. The gulf shore of .Mexico. I have taken it at Tampico. 

 Z tubulifer comes from Orizaba in the Cordilleras.) 



