393] LARVAE OF THE TENTHREDIN01DEA—YUASA 75 



subfamily contains two types of larvae and that most of the aberrant larvae 

 belong to his tribe Hemichroini. It may be pointed out that the Nema- 

 tinae as denned by MacGillivray also contains two types of larvae, which 

 are separable on the presence or absence of the caudal protuberances on 

 the ultimate segment. There are, however, other morphological and 

 biological characters of the larvae which suggest that this subfamily con- 

 tains a number of genera of wide diversity, and that such genera as Ptero- 

 nidea and Pontania might profitably be subdivided into more genera. 



GENERA OF NEMATINAE 



1(18) Tenth abdominal tergum without caudal protuberances 2. 



2(11) Antennae conical or subconical, antennal segments 2 and 3 always complete, segment 

 4 peg-like or conical, at least as long as wide at proximal end; third abdominal 



segment always with six annulets 3. 



3(4) Annulets 2 and 4 glabrous; larvapods glabrous; glandubae obsolete; thoracic legs 



with coxae in part always colored brownish Nematus Panzer. 



4(3) Annulets 2 and 4 not glabrous; larvapods usually not glabrous; glandubae usually 



not obsolete; thoracic legs with coxae usually in part not colored 5. 



5(6) Antennae with segment 3 ring-like, its cephalic portion subequal in length to caudal 

 portion, segment 2 complete, its cephalic portion not reduced to a mere line; body 

 increasing in diameter to abdominal segments 5-6; spiracles usually winged; larva- 

 pods glabrous or with 2-4 or more setae as viewed from lateral aspect. 



Pristiphora Latreille. 



6(5) Antennae with segment 3 not ring-like, its cephalic portion not subequal in length 



to caudal portion; segment 2 usually complete but its cephalic portion reduced to a 



mere line 7. 



7(8) Body increasing in diameter to abdominal segments 5-6, not uniformly cylindrical; 

 spiracles usually winged; larvapods with 4-6 setae as viewed from lateral aspect. 



Diphadnus Hartig. 

 8(7) Body not increasing in diameter to abdominal segments 5-6 but uniformly cylindrical; 



spiracles never winged; larvapods with 1-2 setae as viewed from lateral aspect 9. 



9(10) Thorax distinctly swollen; head pale brownish green; maxillary palpi with segment 2 

 as long on its lateral aspect as on its mesal aspect; legs with femur and tibia con- 



colorous with body, whitish; body with dorsum not shaded bluish green 



Pteronidea Rohwer (in part). 



10(9) Thorax never distinctly swollen; head not pale brownish green but blackish; maxillary 



palpi with segment 2 three times as long on its lateral aspect as on its mesal aspect; 



legs with femur and tibia not concolorous with body but blackish; body with dorsum 



shaded bluish green Lygaeonematus Konow. 



11(2) Antennae not conical or subconical, but flattened; antennal segments 2 and 3 not 

 always complete, segment 4 never peg-like or conical, never as long as wide at 



proximal end; third abdominal segment not always with six annulets 12. 



12(13) Segments with four annulets, annulets 1, 2, and 3 setiferous; gall-makers 



Pontonia Costa (in part) . 



13(12) Segments with more than four annulets, annulet 1 not setiferous; not gall-makers. . 14. 



14(15) Segments with five annulets, annulets 2 and 3 setiferous; antennae with all segments 



fused together; larvapods with two setae as viewed from lateral aspect; body-setae 



very long M kronematus Konow. 



