397] LARVAE OF THE TENTHREDINOIDEA—YUASA 79 



calices surrounded by distinct brownish areas; glandubae probably obsolete, micro- 

 scopic; annulation, 1, 5, 6, 2, 3, 4; on oak; M-20 Pristiphora sp. 6. 



14(13) Head never entirely pale or light brown; vertex always with a dark streak along 

 epicranial stem, sometimes indistinct but never entirely wanting 15. 



15(22) Spiracles winged ; setae ventrad of spiracular lines with calices surrounded by distinct 

 minute brownish areas; antennae always conical; vertex with or without a dark 

 streak dorsad of each ocellara 16. 



16(19) Spiracles with cephalic wings always larger than caudal; glandubae always sessile; 

 glandos microscopic, difficult to detect; setae on latus dorsad of spiracular lines 

 with calices surrounded or not surrounded by distinct brownish areas 17. 



17(18) All setae on latus dorsad of spiracular lines with calices surrounded by brownish 

 areas; vertex dorsad of each ocellara with a brownish streak; annulation, 1, (5, 6), 

 2, 4, 3; body green; head marked as in P. hivittata; length of body, 12-13 mm.; on 

 Salix; M-72 sychophanta Walsh. 



18(17) All setae on latus dorsad of spiracular lines with calices not surrounded by brownish 

 areas; vertex dorsad of each ocellara without a brownish streak, uniformly pale; 

 annulation, 1, (2, 5, 6), 4, 3; body enlarged on abdominal segments 5-6, greenish, 

 with dorsal vessel dark green with white line on each side; head greenish with brown- 

 ish streaks along entire length of epicranial stem, expanding on the dorsal half of 

 front; following parts brown: labrum, mandibles, antennae, cervical sclerites, tarsal 

 claws, and spiracles; antennae conical, segment 4 elongate, conical; on Spiraea latifolia 

 and S. iomentosa; M-4 Pristiphora sp. 7. 



19(16) Spiracles with wings subequal in size; glandubae stalked ; glandos subequal in diameter 

 to calices; setae on latus dorsad of spiracular lines never withcalices surrounded by 

 distinct brownish areas 20. 



20(21) Vertex with a distinct dark streak dorsad of each ocellara ; annulation, 1, 2, (5, 6), 4, 3; 

 length, 16-17 mm.; body cylindrical, increasing in size to abdominal segments 5-6, 

 green, dorsal vessel dark green with fine white line on each side of it; head green, 

 slightly brownish, with fuscous streaks; following parts light brown : dorsal two- thirds 

 of front, labrum, maxillary palpi and galea, labial palpi, and cervical sclerites; follow- 

 ing parts brown: antennae, mandibles, spiracles, glandubae, and setae; antennae 

 conical, distinctly with four setae, segment 4 conical; spiracles with wings; ven- 

 tral glands subequal in size to larvapods; glandos in diameter subequal to or larger 



than calices of setae; setae on dorsimi very minute; on Spirea; Y, M-14,-88 



bivittata Norton. 



21 (20) Vertex without a distinct dark streak dorsad of each ocellara; annulation, 1, 2, 6, 5, 3, 

 4; on Potentilla; M-10 Pristophora sp. 8. 



22(15) Spiracles not winged; setae ventrad of spiracular lines never with calices surrounded 

 by distinct minute brownish areas; antennae limpet-shaped, segments indistinguish- 

 ably fused; vertex always with a brown streak dorsad of each ocellara; glandubae 

 sessile; glandos microscopic, difficult to detect; annulation, 1, (2, 5, 6), (3, 4); length 

 12-13 mm.; body green, with broad dark green dorsal vessel bordered on each side 

 by a fine white line; head greenish brown; setae stifiF, comparatively long, without 

 brown areas surrounding calices; on Geum canadensis; Y -2X2. .Pristiphora sp. 9. 



MiCRONEMATUS KONOW 



Larvae small; length less than 15 mm.; body subcylindrical, tapering 

 at both ends; mesothorax distinctly and metathorax slightly swollen; 

 lateral lobes prominent and swollen; segmentation distinct; annulation 

 indistinct; third abdominal segment with five annulets, annulets 2 and 



