AMERICAN HYMENOPTERA. 63 



somewluit equal, first shortest; second and third cells receiving a re- 

 current nervure ; lanceolate cell contracted; under wings appendicu- 

 late, with two middle cells; stigma of upper wings large, distinct, 

 semi-ovate within; submarginal bullae, six, viz.: one near bottom of 

 first transverse vein, one on submarginal vein just beyond the first re- 

 current nervure, sometimes but rarely actually at the point of recep- 

 tion, and two on each of the second and third transverse veins. In the 

 dark-winged species a paler line connects these bullae. 



Anttnnse, 3-articulate ; third article long, (composed of numerous 

 soldered articles,) filiform and ciliate in males, shorter and rather cla- 

 vate in males and neai'ly glabrous. 



//(•rtr/ transverse, with a tubercle between antennae; labrum trans- 

 verse; mandibles without distinct teeth ; (emarginate, Lepel. ; biden- 

 tate, Stephens); joints of maxillary palpi lengthening regularly from 

 base to apex. 



Bod^ rather short and stout, scutel large, sometimes prominent be- 

 hind, produced to an obtuse angle, the post-scutel forming a lunate ele- 

 vated ridge, the cenchri on each side white, lengthened, oval. 



L<gs simple, anterior tibial spurs not bifid, the four posterior tibi« 

 each with a spine on inner side below the middle ; spurs rather sharp 

 and covered with sparse coarse hairs ; tarsi with small processes be- 

 neath ; claws simple. 



Larva 20-footed, (six pectoral, twelve pectoral, the last pair very 

 small, and two caudal,) the base of the claws of the thoracic (pectoral) 

 feet with a fleshy tubercle. (Hartig, pi. fig. 12 — 15.) The larvae of 

 //. foase. of Europe, are often seen with the extremity of the body ele- 

 vated or curved into the form of the letter S. (Westwood Int. II, 99). 

 The pupii is placed in a gauzy, double-enveloping cocoon. 



The egg is greenish, oval, and is deposited under the surfjice of the 

 leaf or in the ribs or tender stems. 



They do not seem to appear in such numbers as to be injurious to 

 vegetation, although not uncommon. Several species feeding upon the 

 rose and sallow, have been described and figured b}" Hartig, Dahlbom, 

 Klutr. DeGeer. &c. 



