AMERICAN HYiMENOPTERA. 321 



Catalogue of the described TENTHREDINIDJE and TJROCEEID^ of 



North America. 



BY EDWARD NORTON. 



(Continued from page 242.) 



Sub-family 4, LYDIDES, Westw. 



Lijdidcs, Westw., Mod. Int. ii, App. 54, 1840. 

 Li/diens, Brulle, Hym. iv. 658. 1. 



Tenthredinides, Sec. 8, Steph. Brit. Ent. Mand. vii, 95. 

 Tcnthredonidee, Genus 4, 11, 12, Hartig, Die Blattw. 



Aniennse, multiarticulate, short or lengthened, setaceous, simple or 

 pectinate; posterior tibiae often with side spurs ; labruiii minute; saws 

 but slightly serrated at tip, dilated and elbowed at the base. 



5fi. LOPHYRUS, Latr. 

 Lophyrus, Latr., Hist. Nat. des Crust., Lepel. Mon. 53., Leach, Steph., Hartig. Ac. 

 Ihjlotoma «, Fab. Syst. Piez., 20, 1. 

 Difrion, Sohrank, Fauna Boreal. 

 Pteronus, Jurine, Hym. 1807, 61. 

 Tenthrcdo, Panz., Geoffrey, &c. 



Wings with one marginal and four submarginal cells, the cross-nerv- 

 ure between the 1st and 2nd incomplete; 2nd and .3rd submarginal 

 cells each with a recurrent nervure; under wings with two inner cells. 



Antennae 17 — 23 articulate, among the females serrate, with the 

 males bi-pectinate, the rays short toward the apex, sometimes the sev- 

 eral final joints bearing but one; terminal joint simple. 



Ihad transverse, wide in the males, in the females small; maxill® 

 with a tooth-like horny continuation on the inner sides; clypeus small, 

 with distinct, wavy edge; labrum small, roundish; mandibles obtuse, 

 o-toothed, with horny base. 



Abdomen broad. depres.scd in females. 



Legs simple, tibia; with two acute spurs at apex. 



Larvae^ 22-footed, not hairy, social, appearing in great numbers, feed- 

 ing on the pine and fir. 



The females are much larger than the males. 



They form a simple opaque cocoon, which is very small in proportion 

 to the size of their bodies. 



They generally come forth in about two or three weeks, but Curtis re- 

 cords one instance in which an individual remained two years un- 

 changed. Dr. Hartig has given complete details of the transformations 

 of seventeen species, (European). 



The imago presents great variations in color, so that caution should 

 be exercised in determining new species; Dr. Hartig has described no 

 less than sixteen varieties of L. pini. 



TRANS. AMEU. ENT. SOC. (42) JUNE, 1869. 



