37v>j LARVAE OF THE TENTHREDINOIDEA—YUASA 61 



dorsal band or with complicated color-patterns; tenth abdominal tergum 

 convex, suranal or caudal protuberances wanting; ninth abdominal tergum 

 with six annulets, annulet 6 as long as annulet 2; thoracic legs normal, 

 well developed, femur with ventro-distal, conical membranous projection; 

 clypeus with two setae on each side; labrum with 3-5 setae on each side, 

 with or without a median longitudinal depression; maxillary palpi slender, 

 normal; galea digit-like, large; lacinia flattened, with a row of 10-15 setae 

 on the oblique, truncate cephalic margin; stipes with a sharp triangular 

 cephalo-ventral projection; labial palpi long, slender, with segment 2 

 longer than segment 1; mandible with 1, 2, or 3-4 setae; head variously 

 marked, distinctly and densely setiferous; spiracles on third annulet, not 

 winged; larvapods glabrous; glandubae distinct, slender, elongate cylindro- 

 conical, sometimes longer than adjacent setae; cuticle microscopically and 

 densely spinulate; ventral glands wanting; larvae free leaf-feeders. 



The Tenthredininae constitutes, according to MacGillivray, the second 

 subfamily of the series of specialized Tenthredinidae. Rohwer (1911) 

 would divide the subfamily into two tribes, Perineurini and Tenthredinini, 

 using the position of the propodeal spiracles and shape of the cephalic 

 margin of the scutellum as characters for differentiating them. In many 

 cases the larvae resemble those of the Emphytinae. 



GENERA OF TENTHREDININAE 



1(4) Mandibles with more than one seta; labrum with median longitudinal depression; 



legs with dorsal aspect of femur usually less than twice as long as trochanter, but 



often subequal to it .2. 



2(3) Mandibles with two setae Macrophya Dahlbom. 



3(2) Mandibles with four, occasionally three, setae Tenthredo Linnaeus. 



4(1) Mandibles with a single seta; labrum without median longitudinal depression; 



legs with dorsal aspect of femur usually twice as long as trochanter 5. 



5(6) Body with complexly patterned markings on the dorsum; distal segment of maxillary 



palpi usually longer than that of labial palpi; head nearly black . . Tenthredo psis Costa. 

 6(5) Body without complexly patterned-markings on the dorsum; distal segment of 



maxillary palpi usually not longer than that of labial palpi; head pale or light brown 



Neopus MacGillivray 



Tenthredo psis semilutea Norton. — Body on dorsum with complexly 

 patterned purplish-black markings extending to supraspiracular lines; 

 two lighter colored spots on dorso-meson, their apices directed cephalad, 

 cephalic one much larger than caudal; large spot with caudal emargination 

 on latus and contiguous to mesal triangles; subspiracular lobe with faint, 

 minute spots; otherwise ventral half of body including legs and larvapods 

 •whitish; head purplish black excepting the following parts, which are 

 white: genae including antennae and antennariae, lower fourth of front, 

 vertex narrowly, laterad of vertical portion of epicranial arms, clypeus, 

 labrum, and mouth-parts except tips of mandibles, which are black; 



