THE CANADIAN ENTOMOLOGIST. 185 



DESCRIPTIONS OF THE LARV.E OF CERTAIN TEN- 



THREDINID^. 



BY HARRISON G. DYAR, NEW YORK. 



Blennocampa bipartita, Cresson. 



A single fly, bred from a larva on oak at Boston, Mass,, appears to 

 belong to this species. The fly differs from Mr. Cresson's description in 

 that all the tarsi are blackish ; the abdomen above is largely blackish ; 

 there is no luteous tint discernible on the lateral margin of middle lobe 

 of mesothorax ; the anterior and posterior margins of the luteous stigma 

 are blackish and the veins are nearly black. There are two black points 

 in the upper medial cell and one in the second submarginal cell on fore- 

 wings. The larva seems to closely resemble that described in the 5th re- 

 port U. S. Entom. Commission, p. 206, as Monopkadnus dilutus, Cresson, 

 but the fly belongs to a different genus. 



Larva. — Sitting flat on the young leaves of the black oak and eating 

 holes through ; solitary. Head wider than high, rounded above ; smooth 

 green ; eyes black, with a blackish stripe from each to vertex, and two 

 contiguous black spots on upper part of clypeus ; width, 1.4 mm. Abdo- 

 minal feet present on joints 6-1 1 and 13 (20 feet). Body smooth, not 

 annulate, the subventral region folded. Colour uniform green. Two 

 transverse rows on each segment of Y-shaped furcate processes, in a 

 longitudinal plane, arranged as follows : Addorsal, two ; subdorsal, two; 

 substigmatal, one ; subventral, two, not in line, one below the other. 

 The anterior and posterior processes are tipped with black. Length, 12 

 mm. 



F'mal stage. — The larva moulted and entered the ground. Smooth, 

 annulated, with slightly elevated, concolorous warts instead of processes, 

 inconspicuous. Pale greenish, concolorous; head pale testaceous; width, 

 1.4 mm. 



The larva formed an elliptical cell in the ground, lined with a black 

 secretion, about the first of June. The fly emerged the following April. 

 Emphytus canade?isis, Kirby. 

 (The pansy saw-fly.) 



7 ? 9 . The flies differ slightly from Provancher's description in 

 having the fore and middle tarsi dusky toward tips,, while the veins and 

 stigma are black, rather than dark brown. 



Larva. — Eating the whole leaf, curled spirally on the back ; falls off 

 when disturbed. Head rounded, normal, dull black, slightly slaty ; eye 



