367] LARVAE OF THE TENTHREDINOIDEA—YUASA 49 



DlPRION SCHRANK 



As far as known, only one species is represented in North American 

 fauna. An examination of D. simile shows that this genus is not very- 

 different from the other genera of Diprioninae but may be separated from 

 them by the characters of the setae and coloration of the head, and certain 

 minor points. It is not possible to characterize the genus with the material 

 at hand. 



Diprion simile Hartig. — Body robust, length, 25 mm.; latus with a series 

 of yellowish or whitish spots on a uniformly grayish brown background, 

 dorso-meson with a narrow yellowish stripe bordered on each side by an 

 equally narrow grayish brown band; dorso-lateral lines broadly yellowish, 

 interrupted at each annulet by fine transverse lines; supraspiracular 

 lines with three yellow spots, size of spots increasing caudad; dorsad of these, 

 three smaller spots with the middle one largest and subequal to cephalic 

 spot of supraspiracular lines; three spots on subspiracular lines, the middle 

 one being the largest; pedal lines with a large spot on each segment; 

 larvapod with a brownish spot; tenth abdominal tergum and sternum 

 marked with grayish; the tergum with a deep constriction dorsad of suranal 

 lobe; head setae small, slender, hair-like, never spinous or stiff; setae on 

 genae similar to those on front, never stiff and spinous; legs with femur 

 sometimes longer than wide on the dorsal aspect; head black; body yellow- 

 ish gray, mottled; G. 



Subfamily Emphytinae 

 Larvae (Fig. 8) small to moderately large, usually greenish, sometimes 

 striped; body cylindrical, slender, tapering caudad; segmentation distinct, 

 annulation fine, indistinct; third abdominal segment usually with six, rarely 

 seven, annulets, annulets 2 and 4 or 1, 3, 5 and rarely 1, 3, and 6 setiferous; 

 head greenish or brownish; sometimes with spots on vertex and front; 

 labrum with or without a mesal longitudinal depression, with 4-5 labral 

 setae on each side of the meson; clypeus with 2 or 3 setae on each side; 

 mandibles with one seta rarely with two; larvapods on abdominal segments 

 2-8 and 10, well developed, usually glabrous, rarely setiferous; ventral 

 glands wanting; glandubae small, conical, on annulets 1 and 3 or rarely 

 on 2 and 4; tenth abdominal tergum usually setiferous but without paired 

 caudal protuberances, rarely with conspicuous spines on the caudal margin, 

 if spines present, then prothorax and mesothorax on dorsum with two and 

 one protuberances respectively; antennae elongate-conical, with five seg- 

 ments, segments ring-like; thoracic legs usually normal in structure, with 

 femur subequal in length to or slightly longer than tibia, tibia well devel- 

 oped and normal, femur with its disto- ventral angle produced; legs, when 

 modified, short, stout, and trochanter obsolete; mouth-parts normal in form, 

 spiracles not winged; larvae leaf -feeders. 



