419] LARVAE OF THE TENTHREDINOIDEA—YUASA 101 



latus of each segment without minute setiferous spots; on Alnus: Y- 194-4 



Hylolonia sp. 2. 



5(2) Head not always blackish but usually yellowish or brown; thoracic legs not with all 



segments blackish, segments distad of coxa usually brownish or brownish yellow; 



tenth abdominal tergum not always blackish 6. 



6(7) Head blackish; tenth abdominal tergum yellowish; subanal lobe yellowish; spots 

 between larvapods numerous and brownish; latus of each segment with many very 

 minute secondary setiferous spots; tuberculate spots of body yellowish with brown 



border; on oak; Y-214-1-2 Hylotoma sp. 3. 



7(6) Head yellowish or reddish brown; tenth abdominal tergum blackish; subanal lobe 



whitish 8. 



8(9) Area ventrad of pedal folds with many minute setiferous spots; area between larva- 

 pods sometimes with spots; spots on body not uniformly blackish or brownish but 

 blackish on cephalic and also usually on caudal portion of the body those on middle 

 portion brownish or yellowish with brown border sometimes spots all pale yellowish 



brown; head reddish or yellowish brown; on Crataegus; Y-222 



scapularis Klug. 



9(8) Area ventrad of pedal fold without spots; area between larvapods never with spots; 



spots on body uniformly blackish or brownish; head yellowish or yellowish brown; 



on elm; C-C.U. 668 Y-29-24 Hylotoma sp. 4. 



10(1) Antennae button-like, usually wider than long; larvapods on abdominal segments 

 2-7 and 10, eighth segment with rudimentary pair; head blackish brownish or with a 

 distinct median streak from occiput to front; body sometimes not spotted except 

 on each side of the meson on cephalic segments 11. 



11(14) Head blackish or brownish; body distinctly and regularly spotted; tenth abdominal 

 tergum and subanal lobe usually blackish; thoracic legs usually with coxae blackish 

 or brownish and other segments brownish or grayish 12. 



12(13) Tenth abdominal tergum and subanal lobe whitish; all colored areas or spots of body 

 brownish; area between larvapods with few setiferous spots; area ventrad of pedal 

 fold with many setiferous spots; on Salix discolor; C-Young 61. . . .Hylotoma sp. 5. 



13(12) Tenth abdominal tergum and subanal lobe blackish or brownish; all colored areas 

 or spots blackish or brownish; area between larvapods usually without setiferous 

 spots; area ventrad of pedal fold with varying number of spots; on Prunus; Y-1946-1 

 G-Onekama No. 23; Maine 1915; C-C.U. 656 C.U. sub. 64 Hylotoma sp. 6. 



14(11) Head yellowish or light brownish with brown streak along epicranial stem; body not 

 regularly and distinctly spotted except along dorso-meson on cephalic segments; 

 tenth abdominal tergum never blackish or brownish; thoracic legs always con- 

 colorous with body; Y-185-1-2 (Azalea) Y-185 (Willow) M-113 (birch bred) M-108 

 (hazel) macleayi Leach. 



Subfamily Schizocerinae 



Larvae (Fig. 24) small; body subcylindrical, flattened on venter, 

 tapering caudad, mesothoracic and metathoracic segments somewhat 

 swollen, prothorax distinctly tapering cephalad; whitish or creamy white, 

 never spotted or striped; segmentation and annulation indistinct; third 

 abdominal segment with three annulets, all annulets provided with a 

 transverse row of tubercles; spiracles on annulet 1; tenth abdominal 

 tergum without suranal or caudal protuberances; larvapods on abdominal 

 segments 2-8 and 10, the venter of ninth segment with a pair of minute 



