373] LARVAE OF THE TENTHREDINOIDEA—YUASA 55 



scopically verrucose on the dorsum and latus between spiracular lines; on 

 monocotyledonous plants. 



The Dolerinae is a well-defined subfamily with a distinct habitus 

 and is closely allied to the Emphytinae and Selandriinae. The most 

 important adult character for differentiating the group from other sub- 

 families of the generalized Tenthredinidae is the coalescence of the cells 

 R 4 and R5 due to the atrophy of the free part of the vein R 5 . The sub- 

 family contains two genera, the old genus Dolerus and the recently de- 

 scribed genus Loderus. Leach separated, under the name of Dosytheus, 

 all those species having certain antennal peculiarities and, according 

 to Stephens, also having bright colors on the abdomen. This differen- 

 tiation was considered invalid by Hartig and his view was endorsed by 

 Norton and Cameron. Norton described a species under the name of 

 Dorytheus apricus var. albifrons which is now placed in the genus Loderus. 

 The monobasic genus Pelmatopus of Hartig, based on P. minutus, is now 

 considered as congeneric with Dolerus. Since the larvae of Loderus are 

 unknown, the genus Dolerus alone is considered here. 



Dolerus Jurine 



Head viewed from cephalic aspect circular in contour in mature 

 specimens, epicranium semiglobose, front distinctly flattened; mouth- 

 parts directed caudo-ventrad; antennaria never circular, with obtuse 

 corners at the angles of their dorsal side; antennae with formula, 5, (3, 4, 

 2), 1, distal segment conical, apex less chitinized and obtusely rounded, 

 never sharply pointed, segments 2-5 well chitinized, segment 1 narrow but 

 distinctly larger in diameter than distal segments; front distinctly wider 

 than high; labrum asymmetrical, dextral part always larger than sinistral 

 or with pointed ventro-mesal angle; mandible very thick, large, dextral 

 with four distadentes and one curved sharp proxadentis, sinistral with 

 four distadentes and mesal surface deeply emarginate; parapharynx with 

 apex dilated and chitinized; maxillary palpi, galea, lacinia, and labial 

 palpi normal in structure and well chitinized; thoracic legs with femur 

 often produced papilla-like on its disto- ventral angle, tibia long, cylindrical, 

 tapering uniformly distad, distinctly longer than femur, tarsal claw 

 rather slender and straight; abdominal segments with six annulets, typical 

 formula, (1, 2), 3, 4, (5, 6), 1 =5+6; spiracles on annulet 2; annulets 2 and 

 4 with conical glandubae and tiny cylindrical truncate setae with large 

 calices; tenth abdominal tergum semiglobose, anal setae numerous; ventral 

 glands never present. 



The genus Dolerus is represented in North America by more than 

 thirty species but none of them had been identified in the immature stages 

 until the writer reared the adult of D. similis Nort. at Ithaca, N. Y. The 



