NORTH AMERICAN HYMENOPTERA. 303 



no marks : color paler, clearer greenish yellow than hefore, trachese very distinct, 

 white; annulets very obscure; anal jn-ongs with a very faint bhukish shade, a 

 few setae on anal plate. 



Cocoon. — At first pale yellow, latter brown, opaque. 



Food-pla lit. — ^X iUow {Sulix). Found in Central Park, New York, 

 and Plattsburgh, N. Y. I am not certain that I have observed all 

 the stages, but give them as they are in my notes. 



Noinatu<« piiigiiidorstini n. sp. 



Third (i') stdcic. — Eating a hole in the leaf; all green, with marks as in the next 

 stage, but faint; eye black; width of head 1.0 mm. 



Fourth stMie. — Head greenish, eye black, shining, a dark shade bordering the 

 median suture and a brown one from the ocellus upward ; width 1.3 mm. Body 

 translucent, of the color of a solution of chlorophyl ; segments 4-annulate, with 

 indications of dusky tubercles on second and third annulets, segmental incisures 

 folded. On each side of the dorsal vessel is a segmentary patch of pale yellow 

 consisting of a collection of fat granules, showing by transparency, present on 

 joints r,~12. Feet on joints 6-11; on the anal plate are two short, brown-tipped 

 projections. 



Fifth xtaqe. — As before, the fat-patches very evident, pale yellow, consolidated 

 into distinct spots; end of joint 13 above and below deep reddish ; width of head 

 1.75 mm. 



Food-pJniii.—V\\\\ie birch (Betula papi/nfera). The larvse are 

 solitary and rest on the edge of the leaf. Found at Keene Valley, 

 New York. 



I do not know the true number of stages of this species. 



Neiiiatus dorsivitfatus Cresson. 



£(7f/.— Laid in semicircular incisions under the upper epidermis, 1.5 mm. long. 



Second stage.— Head testaceous, a brownish shade up from the black eye ; width 

 .65 mm. Body pale yellowish, the food showing green by transparency, slightly 

 shining, subannulate. 



Third stage.— Hetid as in the next stage, but pale testaceous; jaws black ; width 

 1.0 mm. Body the same, slightly shiniug, subannulate. 



Fourth stage.— Head greenisli, with a slight honey tinge, large, higher than the 

 dorsum; a faint blackish shade runs up not far from the black ocellus whicli is 

 surrounded by a black spot; mouth brown, a dark mark for antenna; width 

 1.4 mm. Body subtranslucent poplar-leaf green, not shining, the segments 

 folded; no annulets, or the merest trace. Feet on joints 6-11, 13: anal prongs 

 short, brownish; blackish marks at the base of the clear thoracic feet; tracheal 

 line evident ; no tubercles. 



Fifth .^tage. — The same, with same width of head. 



Both sexes were sent to Mr. Marlatt and determined as above. 

 Is our species really the same as the Nevada one ? 



Solitary edge-eaters on poplar at Flattsburgh, N. Y. 



The female fly is entirely green, except for the black marks and 

 the legs, which are greenish testaceous. 



TR.\NS. AM. ENT. SOC. XXII. AUGUST, 1895. 



