399] LARVAE OF THE TENTHREDINOIDEA—YUASA 81 



Lygaeonematus Konow 



Larvae comparatively speaking moderately large, length 18-20 mm.; 

 body cylindrical, tapering uniformly and slightly caudad; thorax not 

 swollen; abdomen never swollen; dorsum grayish green and venter pale, 

 head shiny black, only slightly narrower than thorax; antennae conical, 

 with four distinct segments, segment 1 minute, incomplete, and with single 

 sensory pit, segments 2 and 3 narrower on cephalic part than on caudal 

 part, segment 4 conical; labrum with mesal emargination shallow and broad; 

 maxillae with galea larger than labial palpi; maxillary palpi with segment 2 

 three times as long on lateral margin as on mesal; third abdominal segment 

 with six annulets, annulet 1 largest, annulets 2 and 4 setiferous; larvapods 

 well developed, setiferous, with 1-2 setae and single ventral glanduba; 

 glandubae sessile; glandos smaller than calyx of a seta; ventral glands 

 subequal to or larger than larvapods in size; spiracles not winged; tenth 

 abdominal tergum as seen in profile not notched dorsad of suranal lobe and 

 without caudal paired protuberances; setae usually arising from minute 

 fleshy mound-like protuberances; cuticle microscopically spinulate; free 

 leaf-feeders. 



Lygaeonematus erichsoni Hartig. — Length, 18-20 mm.; body somewhat 

 shiny, greenish gray dorsad of spiracular lines, ventrad of them opaque 

 bluish- white, head black; following parts fuscous to blackish: mouth-parts, 

 cervical sclerites, femur, tibia, and claws; following parts grayish: surpedal 

 areas, coxa, and trochanter in part, swellings between legs, and abdominal 

 surpedal areas faintly; annulation, 1, 2, 6, (3, 5, 4); glandos half as large 

 in diameter as calices of adjacent setae; surpedal areas on abdomen with 

 8-10 setae and two glandubae; subspiracular area with 6-7 setae, usually 

 without glandubae; cuticle with distinct microscopic brownish spinulae; 

 on larch; Y-162, M-105, -165. 



Pachynematus Konow 

 Larvae comparatively speaking moderately large; length, 15-23 mm.; 

 body cylindrical, tapering uniformly and distinctly caudad; thorax rarely 

 and abdomen never swollen; third abdominal segment with six annulets, 

 annulets 2 and 4 setiferous, annulet 1 longest, annulet 4 usually shortest; 

 tenth abdominal tergum without a pair of caudal protuberance, and without 

 a notch dorsad of suranal lobe as seen in profile; the tergum sometimes 

 produced distinctly caudad and pointed; suranal and subanal lobes with 

 numerous setae; head brownish or greenish, sometimes with fuscous 

 streak along epicranial stem, semiglobose, subequal in width to thorax 

 or only slightly narrower; labrum with median longitudinal depression, 

 cephalic emargination shallow; maxillae with galea always larger than 

 labial palpi, sometimes more than twice as large; antennae with four seg- 

 ments, flattened, never distinctly conical, segment 1 usually minute, in- 



