1 r>6 HYMENOPTERA. 



We have received from Mr, Angus deserted cells of Cera- 

 tiua in a syringa stem, in which we detected a pupa of an 

 Odynerus, perliaps 0. leucomelas ; tlie cell was a little shortei- 

 thaji that of the Ceratina it had occupied. The cocoon of 

 tlie Odynerus was of silk, and almost undistinguishable from 

 the old cocoon of Ceratina. The wasp had disixjnsed with the 

 necessity of making a mud cell. If future research shows that 

 either this or any other species makes a nuid cell or not at 

 will, it shows the intelligence of these little ''free-agents;" 

 and that a blind adherence to lixed mechanical laws does not 

 (obtain in these insects. 



The lar\ie of Odynerus and P^umenes are carnivorous. 1 

 found several cells of 0. albophaleyatus, June 22d, in the 

 deserted nest of a Glisiocampa^ which were stored with inicro- 

 lepidopterous larviii and pupye, still alive, having been para- 

 13-zed by the sting of the wasp. The larvue of the wasp was 

 short and thick, being, when contracted, not more than twice 

 as long as broad ; the rings of the bod\- are moderately convex, 

 and the pleural region is faintly marked. Prof. A. E. Verrill 

 has discovered the cells of an Och'uerus at New Haven, forming 

 a sandy mass (Plate 5, Fig. 12) attached to the stem of a 

 plant. 



In Enmones the lingua is very long, being narrower and 

 more deeply divided than in Odynerus : tlie second subcostal 

 space of the wings is long and narrow, while in Odynerus it i;> 

 triangular. The genus is easily recognized l\y the very long- 

 pedicel of the abdomen. Eumenes fratenni Saj' constructs 11 

 thin cell (Plate o,* Fig. 15) of pellets of mud, and as large 



* Explanation of Plate 5. Fig. 1. Month of the tunnel of Avgochlora pnrits . 

 Trom Emertnn. Fig. 2. Cells of Osmia pacifica ; coaiinuuic.ated by Mr. Sanborn. 

 Fig. 3. Vertical section of nest of Vespa with a grou)) of primitive cells surrounded 

 by one layer of paper, and part of another; from Saiissure. Fig. 4. Nest of Po- 

 li.-iles aiinuUtri.it; from Saussure. Fig. 5. Three primitive cells of Polistes; 5rt, top 

 view of the -s.-ime, one being eggless. The sides adjoining are angular. Figs. G and 

 *'<ii, a cell farther advance<l, consisting of four cells, each containing an einfi, and 

 with the edges of the cells built up higher and more decidedly si.x-si<led; original. 

 Fig. 7. Cells of Icaria r/nUatipemii.s. showing that each cell is l)ui!t up independentlv 

 m regular hexagons. Fig. 8. Ground plan of a simi'ar nest. Fig. !). Ground plan 

 of cells of Tiitua morio ; from Smith. Fig. IC. Nest of MisclwcyUnrua labiatii<: 

 from Saussure. Fig. 11. yie^^t of ApnMi paUida; from Saussure. Fig. 12. Nest nf 

 Vdynerun bireiiinuiculutus. Fig. 13. Nest of Odynertix albophaleratus •• original. 

 Fig. 14. Mud cell of PelopcBUs flavipex ; original. Fig. l.i. A row of spherical cells 

 of EumciH'it friiterii". with the female ; from Harris. 



