44 ILLINOIS BIOLOGICAL MONOGRAPHS [362 



16(17) Legs with tibia minute, distinctly shorter and smaller than femur; maxillae with 



stipes without cephalo-ventral triangular projection; mandibles with two setae; 



labrura without a median longitudinal depression 17. 



SELANDRIINAE (in part). 

 17(16) Legs with tibia large, usuall}^ subequal to or longer than femur; maxillae with stipes 



with cephalo-ventral triangular projection; mandibles with 1, 2, or 3-4 setae; labrum 



with or without a median longitudinal depression TENTHREDININAE. 



18(13) Antennae not conical, with one segment; labrum with secondary longitudinal 



sutures; small but distinct crescentic glandubae dorsad of spiracles. CIMBICINAE. 

 19(12) Third abdominal segment with five, rarely three or four, annulets on dorsum; 



body with conspicuous branched spines or tubercles. BLENNOCAMPINAE (in part). 



20(3) Thoracic legs with four segments, modified .21. 



21(22) Tenth urotergum and prothoracic and mesothoracic tergites with conspicuous fleshy 



pointed protuberances; body not tadpole-like EMPHYTINAE (in part). 



22(21) Tenth urotergum and prothoracic and mesothoracic tergites without conspicuous 



fleshy pointed protuberances; body often distinctly tadpole-like. 



PHYLLOTOMINAE (in part). 

 23(2) Larvapods on abdominal segments 2-7 and 10, rarely on segments 2-7 or 2-6 and 



10 24. 



24(39) Thoracic legs with five segments, normal in form; larvapods on segments 2-7 and 



either with or without anal larvapods 25. 



25(36) Larvapods present on the ultimate segment, either normal and separated or fused 



on the meson, forming a single prominence 26. 



26(35) Anal larvapods normal and separated 27. 



27(28) Antennae with five segments; third abdominal segment with six annulets; tenth 



abdominal tergum with several caudal protuberances. HOPLOCAAIPINAE (in part). 



28(27) Antennae with four, rarely three, segments; third abdominal segment usually 

 with less than six annulets; tenth abdominal tergum with or without caudal protu- 

 berances 29. 



29(32) Abdominal segments 1-7 on ventro-meson with an eversible gland; body often with 

 numerous conspicuous setae, setae arising from distinct tubercles; antennae with four 

 segments 30. 



30(31) Body with numerous conspicuous multisetiferous tubercles, each tubercle bearing 

 several long setae, some of which are distinctly longer than others; third abdominal 

 segment with four annulets, annulet 1 with a transverse row of setae, annulets 2 and 

 3 with a transverse row of setiferous tubercles; tenth abdominal tergum never with 

 caudal protuberances altho with numerous long setae; setae barbed .CLADIINAE. 



31(30) Body without numerous conspicuous multisetiferous tubercles, if tubercles present, 

 they do not bear several long setae some of which are distinctly longer than others; 

 third abdominal segment with varying number of annulets; tenth abdominal tergum 

 sometimes with caudal protuberances; setae not barbed NEMATINAE. 



32(29) Abdominal segments 1-7 on ventro-meson without an eversible gland; body never 

 conspicuoush^ setiferous; antennae with three or four segments; third abdominal 

 segment with three or five annulets 33. 



33(34) Antennae with four segments; third abdominal segment with five annulets; abdom- 

 inal segments 2-4 and 8 or 2-5 and 8 without a postsubspiracular sucker-like pro- 

 tuberance HOPLOCAMPINAE (in part). 



34(33) Antennae with one segment; third abdominal segment with three annulets; abdominal 

 segments 2-4 and 8 or 2-5 and 8 each with a postsubspiracular sucker-like protuber- 

 ance ACORDULECERINAE. 



