68 ILLINOIS BIOLOGICAL MONOGRAPHS [386 



blackish lines on subspiracular and pedal lines; tenth abdominal tergum 

 with six to seven conical protuberances, suffused with brown; surpedal and 

 subspiracular lobes with two setae and two glandubae; glandubae with 

 diameter twice that of anal setae; annulation, (1, 2, 4) 3, 5; on alder; Y-39- 

 -1-1,-8.73 (?) -l,-8.73(?)-2, C-8. 



Marlattia Ashmead 



Larvae comparatively very small, greenish, with or without stripes 

 or spots; body cylindrical, tapering caudad; third abdominal segment 

 with five annulets, annulets apparently glabrous; tenth abdominal seg- 

 ment without caudal protuberances; antennae with four segments, flat- 

 tened; segment 1 small, incomplete; segments 2 and 3 complete but 

 reduced to narrow line on cephalic aspect; segment 4 minute, mamma- 

 like; head sparsely setiferous, setae increasing in length on the lower 

 portion; thoracic legs normal in form, tibia subequal in length to femur; lar- 

 vapods with a few setae; spiracles minute, un winged; glandubae micro- 

 scopic. 



Marlattia laricis Marlatt. — Head pale yellowish, body greenish with 

 faint subdorsal lines; third abdominal segment with five annulets, (1, 2) 

 4, 3, 5; larvapods with three setae; suranal lobe with a few setae on caudo- 

 ventral aspect; small larvae, length, 10 mm.; M-57. 



Caulocampus Rohwer 



Larvae very small; length less than 10 mm. ; body subcylindrical, taper- 

 ing at prothorax, constricted suddenly on the ultimate segment, not 

 spotted or striped, but whitish, sparsely and microscopically setiferous; 

 third abdominal segment with four annulets, annulets 2 and 3 with very 

 minute setae; thoracic legs minute, with five segments, tibia longer than 

 femur; abdominal segments 2-7 with rudimentary larvapods represented by 

 spinulate swellings; tenth abdominal tergum much smaller in diameter 

 than preceding segments, strongly converging caudad, caudal margin 

 produced and chitinized, a pair of minute brownish caudal protuberances 

 on the caudal margin of the projection; head small, sparsely and minutely 

 setiferous; ocellarae represented by pigmented spots, distinct, ring-like, 

 ocularia wanting; antennae apparently with three segments, conical, seg- 

 ments 1 and 2 incomplete, segment 3 slender, peg-like; mouth-parts 

 normal and conspicuous tho small; spiracles not winged; glandubae 

 obsolete; in young specimens dorsum of abdominal segments 1-7, with a 

 pair of protuberances on annulet 2; larvae borers in leaf -petiole. 



This genus is monotypic and unique in the reduction of larvapods 

 and ocellarae and in the possession of modified caudal projection on the 

 ultimate segment with rudimentary caudal protuberances. In this last 



