208 THE CANADIAN ENTOMOLOGIST. 



DESCRIPTIONS OF THE LARV^ OF CERTAIN 

 TENTHREDINID^. 



BY HARRISON G. DYAR, A. M. NEW YORK. 

 ( Continued frofn page i()6, ) 



Eighth stage. — Head shining black, yellowish punctured around the 

 mouth, antennae yellowish ; eye and jaws black ; width, 1.8 mm. Body 

 ochreous yellow, 6-annulate with irregular quadrate sub-dorsal (two per 

 segment) and lateral (one per segment) black spots, confluent on joint 13; 

 sub-ventral ridge faintly discoloured ; anal plate blackish. No white 

 secretion. The larvte do not feed in this stage, but seek for soft wood in 

 which they bore their galleries for pupation. 



Eight stages is probably the least number which these larvae have. 

 I have found them with the following widths of head: — 2.2 mm., 2.45 

 mm , 2.9 mm. This indicates that they may have as many as eleven 

 stages, perhaps in the case of large females. 



Acordulecera dor sails, Say. 



Determined by Mr. MacGillivray. 



Only on the very young leaves of the black oak, eating the whole 

 leaf down irregularly. Sitting flat on the venter, but holding on by the 

 thoracic feet, and flap up the abdominal portion when disturbed. Feet 

 on joints 6-11, 13, but very small, nearly aborted, none of them used ; 

 thoracic feet large. Body smooth, stiff as if inflated, shining colourless, 

 the food showing green. Segments marked into 4 annulets by creases, 

 not incised. Sub-ventral fold prominent, in the centre of the segment, 

 giving the outline a fluted appearance. Tracheae very evident. Head 

 colourless, tinged with blackish, or with brownish in the last growing stage 

 (width, .8 mm.), especially below ; a little fine pile ; eye black, mouth 

 brown. 



Last stage. — The larvae moult and enter the ground ; colour faintly 

 bluish, less transparent and with distinct blackish dots in three transverse 

 rows per segment. Head grayish-tinted; width, ,8 mm. Body smooth, 

 a little shiny, sub-ventral folds scarcely prominent. 

 Hylotoma McLeayl, Leach. 



I was much surprised to find that the larvae which produced flies of 

 this species were totally diff"erent from those described by Norton (Trans. 

 Am. Ent. Soc, IV., 78, 1872).* 



*I have seen the larvLit; which he describes, but their structure and position are 

 like those of the species of Emphylus which I have bred. My larva; died. 



