361] LARVAE OF THE TENTHREDINOIDEA—YUASA 43 



maxillary and labial palpi typically with four and three segments respec- 

 tively, never obsolete, number of segments rarely reduced; clypeus usually 

 with two or three setae on each side; mandibles usually with one to four 

 setae; tenth abdominal tergum without suranal process and sometimes 

 with caudal protuberances; subanal appendages never present; epicranial 

 suture and vertical furrows usually present; metaspiracles functionless, 

 obsolete, or very much smaller than abdominal spiracles; various glands 

 sometimes present. 



The family Tenthredinidae according to MacGillivray contains twenty- 

 four subfamilies of which five are not represented in the Nearctic 

 fauna. The subfamilies found in the United States and Canada are as 

 follows: Diprioninae, Emphytinae, Selandriinae, Dolerinae, Phyllotominae, 

 Lycaotinae, Tenthredininae, Cimbicinae, Hoplocampinae, Dineurinae, 

 Monocteninae, Cladiinae, Nematinae, Blennocampinae, Fenusinae, Sco- 

 lioneurinae, Hylotominae, Schizocerinae, and Acordulecerinae. Of these, 

 Lycaotinae and Dineurinae have not been available for study. 



SUBFAMILIES OF TENTHREDINIDAE 



1(42) Thoracic legs normal in form, five-segmented; if modified, tarsal claws always 



present; larvapods usually well developed 2. 



2(23) Larvapods present on abdominal segments 2-8 and 10; antennae elongate, conical, 



usually with five segments 3. 



3(20) Thoracic legs with five segments, normal in form 4. 



4(11) Third abdominal segment with six annulets on dorsum 5. 



5(10) Antennae conical, with five segments 6. 



6(9) Labrum bilaterally symmetrical; legs with tibia shorter than femur, tarsal claws 



short, strongly curved 7. 



7(8) Body rather slender, tapering caudad, without small distinct tubercles; tenth 

 abdominal tergum without small tubercles; head never shiny, jet-black, body never 



yellowish white EMPHYTINAE (in part). 



8(7) Body rather robust, uniform in diameter thruout, with small distinct tubercles; tenth 

 abdominal tergum with several small protuberances, if without, head shiny, jet- 

 black, body yellowish white BLENNOCAMPINAE (in part). 



9(6) Labrum not bilaterally symmetrical, but distinctly asymmetrical; legs with tibia 



longer than femur, tarsal claws slender, only slightly curved DOLERINAE. 



10(5) Antennae not conical, with three segments, the third segment erect and peg-like. 



DIPRIONINAE. 



11(4) Third abdominal segment with more or less than six annulets on dorsum 12. 



12(19) Third abdominal segment with seven annulets on dorsum; body without conspicuous 



branched spines or tubercles 13. 



13(18) Antennae conical, with five segments; labrum without secondary longitudinal 



sutures 14. 



14(15) Larvapods setiferous; clypeus with three setae on each side; mandible with two 

 setae; labrum without a median longitudinal depression . . SELANDRIINAE (in part) . 



EMPHYTINAE (in part). 



15(14) Larvapods glabrous; clypeus with two setae on each side; mandible with 1-4 setae; 



labrum with or without a median longitudinal depression 16. 



