375] LARVAE OF THE TENTHREDINOIDEA—YUASA 57 



more brownish than on meson; legs with femora without disto- ventral projection; 

 length, 20-23 mm.; on sedges; Y-28-l,-27-l-l,-30,-210-l-8.32(?)-l-l, M-7,-8,-9,-35, 

 -64,-193,G-d-3. Dolerus sp. 7. 



Subfamily Phyllotominae 



Larvae (Fig. 11-12) small, length usually less than 15 mm.; body sub- 

 cylindrical or depressed, without colored patterns; larvapods on abdominal 

 segment with two or six annulets; antennae with 3-4 or 5 segments; 

 thoracic legs with four segments, short, stubby, with or without tarsal 

 claws. 



The Phyllotominae can be divided into two distinct tribes on the basis 

 of the larval characters. The tribes can be separated as follows: 



Thoracic legs with tarsal claws; head normal in form, not depressed; third abdominal 



segment with six annulets; external feeders Phyllotomini. 



Thoracic legs without tarsal claws; head depressed; third abdominal segment with 

 two annulets; leaf-miners Phlebatrophini. 



The Phyllotominae is a distinct group and includes four genera, Phyl- 

 lotoma, Caliroa, Endelomyia, and Phlebatrophia. In the Nearctic region, 

 the last three genera are represented by a limited number of species. 

 MacGillivray considered this family as one of the five generalized sub- 

 families of the Tenthredinidae, quite apart from the Fenusinae and 

 Scolioneurinae, but Rohwer would associate them in his subfamily Mes- 

 sinae while Konow would include Hoplocampinae and Phyllotominae 

 in his tribe Hoplocampides. The subfamily is divisible into two distinct 

 groups according to the characters of the larvae. The remarkable speciali- 

 zation of structures due to the leaf-mining habit of the larva in one genus 

 where specialization has proceeded much further than in any of the other 

 leaf-miners, makes the division of the subfamily into two tribes desirable. 



Tribe Phyllotomini 



Body practically subcylindrical, thorax distinctly swollen, some- 

 times distinctly tadpole-like, tapering caudad; segmentation and annu- 

 lation indistinct, fine, subequal in length; third abdominal segment 

 with six annulets, annulets 2 and 4 microscopically and sparsely setiferous 

 or minutely tuberculate; tenth abdominal tergum with or without tubercles; 

 thoracic legs as long as head is wide, subequal in size, short, modified, with 

 four segments, stubby, with distinct tarsal claws, coxa conical, femur 

 cylindrical, as long as wide, tibia convex, wider than long, distal segment 

 very minute, with sharp incurved claw; larvapods on abdominal segment 

 2-8 normal in form, glabrous, distal lobe with a minute point on its cephalo- 

 ventral angle; ultimate segment with a pair of normal larvapods or without 

 any; head small, normal, not depressed, sparsely setiferous, longer than 



