AMERICAN HYMENOPTERA. 39 



Family II.— UROCEKID^E. 



A. Xcck not elongate, ovipositor concealed. 



a. Wings with one marginal and two subraarginal cells 1, Oryssus. 



B. Xerk elongate, ovipositor distinct. 



b. Wings with one nnarginal and four submarginal cells. Ovi- 

 positor exserted, short 2, Serecyrta. 



c. Wings with two marginal and four submarginal cells. Ovi- 



positor long. 



1. The first, second and third submarginals each with a 



recurrent nervure ;'., Xiphydria. 



2. The second and third submarginals each with a recur- 



rent nervure. 



Antenna; 17 — 25-articulate 4, Tlrocerus. 



An ten use 5 — 6- articulate (J, Teredon. 



d. Wings witli two marginal and three submarginal cells 5, Tremez. 



2\(huh(r Sfatrment of the Form mid Habits of tlte lai'VPe of the Ten- 

 threAinldfe.. (From Westicood' s Int. Vol. II, p. 97.) 



"Larvpe, with extremity of the body not armed with a spine. 



A. Lartce vjith 22 legs, ( 6 pectoral, 14 abdominal, and 2 caudal.) 



a. Feeding upon the leaves of plants. 



Solitary, resting in a spiral manner, ejecting a fluid from the pores of 

 the body ; forming a cocoon {Civibex, Ti-ichiosotna, Clavellaria.) 



Solitary or social, not ejecting a fluid from the sides of the body; form- 

 ing or not forming a cocoon. {Tenthi'edo, Athalia, and certain Allanti 

 and Dolerus.) 



b. Feeding upon the leaflets of the pine, social, not ejecting a fluid from 



the sides of the body; quiescent, attached by the legs to the edges of 

 the leaflets; forming a cocoon. (Lophyrus.) 



B. Larv(z with 20 legs, (6 pectoral, 12 abdominal, and 2 caudal.) 



a. Feeding upon the leaves of plants; resting at the edges or upon the sur- 



face of the leaves. {Hylotoma atrata, &c., Cladius, Fristiphora, Nematus, 

 Crcesus, and certain Tenthredines. [Likewise Zurca and Abia, according 

 to St. Fargeau.]) 



b. Feeding upon the leaflets of the pine, social; resting at the edge of the 



leaflets; forming a simple cocoon, {Nematus abietinus and Leac/i.ii.) 



c. Living in the galls of plants. (Kiematas intercus.) 



C. Larva with 18 legs, (6 pectoral, 10 abdominal, and 2 caudal,) Hylotoma enodis. 



D. Larvce with only 6 pectoral legs, [Lyda [and Xipihydria, according to Dahlboinj 



Cephas.) (According to Westwood tlie larva of Xiphydria has a horny tail.") 



Sub-flmiily I.— CIxMBICIDES, Westw. 



Antennse a — 8-jointed, short, generally clavate, third article longest. 

 A. Wi/igs with two marginal and three submarginal cells. 



a. First submarginal cell with two recurrent uervures. 

 Lanceolate cell with straight cross-line. 



