NORTH AMERICAN HYMENOPTERA. 301 



ON THE LARVvE OF KOiVIE IVEjflATOID A\1> OTHER 



SAIV-FEIES FRO.n THE NORTHERN 



ATEAXTIC STATES. 



BY HARRISON G. DYAR. 



The larvpe of our saw-flies have been much neglected, and the 

 majority of those here described have not been referred to previously 

 in literature, though they were collected at random. They include 

 onl}^ those that I have succeeded in bringing to imago. Mr. C. L. 

 Marlatt, of the Department of Agriculture, has kindly determined 

 a number of them. 



Priii^tiphora tibiali$$ Nort<m. 



Larva. — Head whitish, scarcely shiuing, eye black, mouth brown ; a green tint 

 by transparency ; width 1.5 mm. Body smooth, not shiuing, faintly 4-annulated, 

 translucent leaf-greeu, the pulsating edges of the dorsal vessel forming a geminate 

 white doi-sal line, filled in with the darker green blood, the anal end usually 

 touclied with crimson ; segmental incisures a little folded, forming transverse 

 whitish bands when the segments are retracted ; tracheal line evident; thoracic 

 feet clear, moderately sjireading, abdominal ones small, present on joints 6-11 

 and 13. 



Last stage.— As before, but the head is shining, with brown dots; body also more 

 shiny ; width of head the same as before ; the larvae form brown cocoons in the 

 earth. 



Found on the white birch (Betida papyrifera), sometimes hiding 

 under the bai'k, or on the leaves at Keene Valley, New York ; also 

 on willow and yellow birch at Jetlerson, N. H. 



IVeiiiatiis siinilaris Xortou. 



£(/(/. — The eggs are laid in incisions, solitary under the lower epidermis, the 

 cuts forming semi-circular incisions .8 mm. in diameter. 



First stage. — Eating a hole in the leaf; lashing the body when disturbed. Head 

 entirely blackish, almost black, mouth pale, width .4 mm. Thoracic feet large, 

 black except at the joints. Body annulate, shining, translucent whitish ; ali- 

 mentary canal green; a pair of button-like, hilack anal tubercles; no suranal 

 plate visible ; feet on joints 6-11 small, concolorous; on joint 13 rudimentary. 



Second stage. — Head pale, shaded with brown, most distinctly in a vertical me- 

 dian and lateral stripe; eye and mouth dark; width .6 mm. Thoracic feet 

 watery, black at base and tip. Body more greenish than before, as the alimen- 

 tary canal shows plainer ; traces of blackish subventral tubercles. 



Third stage. — As in the next stage, but the markings on the head are more dif- 

 fuse and brownish ; width .9 mm. Thoracic feet black tijjiied. 



TRANS. AM. ENT. SOC. XXII. AUGUST. 1895. 



