407] LARVAE OF THE TENTHREDINOIDEA—YUASA 89 



2(3) Tenth abdominal tergura without paired caudal protuberances; tibia distinctly 

 longer than femur; head brownish or yellowish with space between ocellarae across 

 the front paler; Y-8-4- 1,-8-4-3,-8-6-1, C-y67, M-212; on Salix pomum Walsh. 



3(2) Tenth abdominal tergum with paired caudal protuberances; tibia not distinctly 

 longer than femur 4. 



4(5) Suranal lobe not produced caudad, as a small mesal projection, but with a pair of 

 caudal protuberances, small but normal in position, near the lateral ends of the 

 caudal margin; head blackish or blackish brown, space along epicranial suture paler; 

 spiracles usually not winged; dorsum of segments not transversely marked with 



gray; on Salix; Y-7-1,-7-4-1,-8.8, C-cu 201, M-92 hyalina Norton. 



5(4) Suranal lobe produced caudad, forming a small mesal projection which bears rudi- 

 mentary paired protuberances; head light brown with front and vertex dorsad of 

 each ocellara darker; spiracles usually winged; dorsum of segments transversely 

 marked with gray; antennae with segments 3 and 4 fused; labrum with mesal emar- 



gination obsolete 6. 



6(7) Gall not transected by the leaf, but attached to one surface, point of attachment 

 showing as discolored scar; greater part of gall free from the leaf; two or more galls 



sometimes adjacent; woolly small-leaved willows; M-148 Pontania sp. 1. 



7(6) Gall transecting the leaf; usually only one gall on a leaf 8. 



8(9) Gall involving the midrib; surface of gall irregularly constricted; sometimes 2 or 



more galls adjacent; M-226 devincta MacGillivray. 



9(8) Gall not involving the midrib tho extending to it 10. 



10(15) Long axis of gall parallel to midrib; leaf transecting the gall into two subequal 

 parts 11. 



11(12) Gall kidney-shaped, strongly convex, about 14 mm. in length; M-213. Pontania sp. 2. 



12(11) Gall not kidney-shaped 13. 



13(14) Gall bean-shaped, slightly convex; 12-14 mm. in length; Y- 191-1-1 



demissa McGillivray. 



14(13) Gall bean-shaped, strongly convex; 14-15 mm. in length; M-262. .Pontania sp. 3. 



15(10) Long axis of gall transverse to midrib 16. 



16(17) Gall transected by leaf into two subequal semiglobose parts, surface not constricted 

 by a furrow; M-211,-216 Pontania sp. 4. 



17(16) Gall transected by leaf into two unequal parts; surface constricted by a furrow; 

 M-93 Pontania sp. 5. 



2. Leaf-folders 



18(1) Tenth abdominal tergum always with the paired caudal protuberances 

 which are sharply pointed, normal in position, and longer than wide at proximal 

 end; tergum usually with paired blackish or brownish markings; ninth abdominal 

 tergum with or without distinct paired markings or transverse rows of minute 

 spots 19. 



19(20) Tenth abdominal tergum without distinct paired blackish or brownish markings; 

 head entirely yellowish; M-150 Pontania sp. 6. 



20( 1 9) Tenth abdominal tergum with distinct paired blackish or brownish markings 21. 



21(26) Ninth abdominal tergum without any markings or spots; antennae with segment 3 

 sometimes incomplete 22. 



22(25) Tenth abdominal tergum with markings extending entire length and dumbbell- 

 shaped ; antennae with segments 2 and 3 usually complete 23. 



23(24) Folded portion of leaf irregularly wrinkled; usually both edges folded; M-175. 

 1-1 Pontania sp. 7. 



24(23) Folded portion of leaf not irregularly wrinkled; usually one edge folded; Y-31-1-1, 

 -8, 46(?)-2-2 Pontania sp. 8. 



