THE CANADIAN ENTOMOLOGIST, 337 



THE LARV^: OF THE NORTH AMERICAN SAW-FLIES. 



BY HARRISON G. DYAR, PH. D., NEW YORK. 



It appears from a reference to the literature, that the larvse of less 

 than 25 per cent, of the Tenthredinid;*? listed as inhabiting the north- 

 eastern United States and Canada have been described. Of the Western 

 species, scarcely half a dozen are known. 



It seems desirable that something should be done to increase interest 

 in this neglected subject, and I have thought it well to prepare a synoptic 

 table of the larvae already known, to facilitate the recognition of specimens 

 and better indicate those as yet undescribed, and therefore needing study. 



In the following table the Western species are excluded. If, by 

 good fortune, any student of this group should arise there, he would find 

 the field practically clear. 



To the eighty odd species described I have added about forty well- 

 marked forms, the diagnoses being taken from my notes on larvae not yet 

 reared ; but as I intend to determine them as rapidly as possible, I 

 have thought it best to include them, indicating them by marks to cor- 

 respond with my notes. 



The species of Schizocerus are omitted. S. fumipemiis is Califor- 

 nian, and the two sweet-potato feeders, S. ebenus and -S. privatus, are so 

 imperfectly described that I cannot place them. 



I shall be grateful to receive notes of any corrections or additions and 

 the names of any of the undetermined forms. 



RECOGNITION TABLE FOR THE KNOWN SAW-FLY LARV^B OF THE 

 NORTHERN ATLANTIC STATES. 



(Abdominal feet present on joints 6-13; rarely rudimentary or 



( absent in leaf-mining forms 2 



j Feet on joints 6-1 1, either present on joint 13 or rudimentary. 

 { Cocoon compact, dark brown 27 



I Feet on joints 6-10, or slight on joint 11 ; cocoon reticular, of 



I yellow silk 48 



f Without abdominal feet. A pair of long antennae on the head 



I and jointed processes on the last segment 53 



2. Sitting flat on the surface of the leaf ; slug-like 3 



Sitting on the needles of pine 18 



Sitting on the edge of a leaf or curled spirally 20 



Leaf miners 26 



3. Shining, sticky, slug-like 4 



Smooth, not shining 10 



