78 



HYMENOPTERA OF AMERICA. 



[PART I. 



inflated petiole, shorter 2d segmeut, with rather sinuated margin, 

 etc. See also the E. Nortoniana and Cressoniana. 



//nI). The Gulf side of Mexico. (1 have takeu some specimens 

 of it a; Tampico.) The Oriental Cordillera, Banio (Mr. Surni- 

 chrast). '.• ?. 5 %. 



Nota. — .Mr. Sumichrast attributes to this insect a most interest- 

 ing nest. It i- formed of a mass of cellules or habitations com- 

 1 of a black bark which seems to he agglutinated by some 

 gummy material. These habitations are more or less cylindrical 

 ami gummed one against another. But although they form a 

 double row, they are not always parallel like- the cells of social 

 wasps, bui a little oblique the one upon the other, which renders 

 their arrangement quite irregular. This nest is fixed upon a 

 little branch of the oak. It greatly resembles in its system that 

 of Zfthus Eomandinus, which I have cited as apropos of this 

 specie.. But its surface, instead of being fibrous, is here cellulous- 

 rugose; one remarks here some little rounded or polygonal cells, 

 the borders of which form a sort of reticulation, which is, how- 

 ever, but a simple sculpture; the fossettes are too small to he 

 compared to basal sockets, and have absolutely nothing in common 

 with the outlines of cells which one often finds on the borders of 

 wasps' nests. I should not be surprised if this nest should be 

 rather that of a Zethus than of the E. mexicanus, and that it 

 should prove to be an error in the "etiquette" mark. 



16. K. Suuiiclarasti n. pp.— Crassiuseulus, nig' r; clypeo bidentato ; 

 thorace qnadrato, tiMiuissime ruguloso; abdomine nitido, petiolo sparse 

 pnnctato, campamilato, hicra=sato-marginato ; apfce sulcodiviso ; frontis 

 macula, margins postico pronoti, abdominis segmentorum 1\ 2 1 Limbo, 

 post-scutelloque. flavis. 9. 



Total length, 11 mill.; wing, 8.3 mill. 



?. Quite closely relate,! to E. Mexicanus. A little larger. 

 Clypeus bidentate, nol so much flattened. Thorax a little longer, 

 not so distinctly punctured but quite delicately shagreened all 



over. The petiole more campanulate, wider, truncate: much 

 swelled, also bordered by a salient cordon, but parted by a groove 

 with a shallow impression be 1 ',, re the border; 2d segment rather 

 .■Ion-ate, the lamellar edge very narrow, hardly distinct, although 

 the (ir-t edge is not thick. 



Black, with grayish-silky reflection; abdomen silky-shining, 



