THE CANADIA.N ENTOMOLOGIST. 235 



NOTES ON SAWFLY LARV^. 



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



Trichiosoma triangulum, Kirby. 



Two flies have emerged from cocoons which had passed two winters. 

 Last summer I noticed an example of mistaken instinct. The eggs of this 

 species are laid under the lower epidermis by saw-cuts in the edge of the 

 leaf. Several eggs so laid were found on Ilex verticillata. In due time 

 the larvae hatched, but refused their food, and would undoubtedly have 

 perished had I not recognized them and supplied them with willow, which 

 they attacked voraciously. 



Macrophya tibiaior, Norton. 



The description of the larva of this species in Harris's Correspond- 

 ence, p. 369, is included in the first paragraph only. The remaining 

 notes under the same heading refer to larvae of Ha^-piphorus varianus. 



M. tibiator has a variable number of stages^ difficult to determine, 

 much as in the case of H. varianus. I have mature larv» with width of 

 head 1.4, 2.2 or 2.5 mm. The following description is a little more 

 definite than that of Harris, though his is excellent : — 



Pale yellowish, thickly overspread with a fine mealy-white secretion, 

 less abundant subventrally and on the legs, which consequently appear 

 yellowish ; venter without bloom ; anal plate concolorous. On vertex of 

 head a large defined black band ending in a rounded point above the 

 clypeus ; eye in a black spot. Segments 7-annulate ; a row of small 

 velvety black lateral spots, two per segment (on third and fifth annulets 

 above the spiracle), the anterior spot the larger ; only one spot on joints 

 3 and 4, none on joint 2, and only a trace of any on joint 13. Thoracic 

 feet colourless, with a black mark at the extreme base. Abdominal feet 

 on joints 6 to 13. The larvit curl spirally like the Cornus larvae. Some- 

 times the white secretion become slightly woolly, but never as in 

 H. varianus. Head only slightly pruinose. 



Ultimate stage. — Head shining, dull honey-yellow, finely shagreened, 

 no marks ; eye black. Body segments neatly 7-annulate, very shining, 

 pale greenish-yellow, without marks or any white bloom except the dark 

 spiracles and faint tar-brown shades in the folds. Thoracic feet colour- 

 less. The larvas immediately enter the earth. Found on the elder 

 (Sambucus) in VanCortlandt Park, New York, and also sent me by Mrs. 

 Slosson, from Franconia, N. H. 



