BIRCH SAW-FLIES. 509 
Larva. — Head small, pointed iii front, half as wide as the body, jet black. Body 
tapering a little from the prothoracic segment, slightly flattened ; protboracic seg- 
ment large, nearly as long as wide, with a dark central patch ; the second segment 
slightly larger than the third. Body white, with spare whitish hairs. Three pairs 
of dusky legs, short, and extended out laterally. Length, 4 mm . 
80. Hylotoma dulciaria Say. 
Order Hymenoptera ; family Tenthredinid^e. 
Eev. T. W. Fyles found the larvae of tbis species to be injurious to 
the birches in the vicinitv of Quebec during the autumns of 1885 and 
1886. The perfect insects which he bred from the larvae appeared in 
July, but they probably lay their eggs in August, as it was not until 
that month that he found the saw-flies in their natural haunts, when 
they were so numerous as to be u trodden under foot by the passers-by 77 
(Can. Ent., Feb., 1886, Mar., 1887). 
Imago. — Pale rufous ; head, wings, and feet violaceous black. Female : antennae 
black, with a violaceous tinge ; nasus emarginate, short ; head, a spot on pectus and 
ovipositor-sheaths blue-black ; rest of the body testaceous or yellowish red; legs 
steel blue; spines of the same color; wings, violaceous, subhyaline, less obscure at 
apex, a larger darker spot below the stigma covering the marginal and the upper half 
of all the submarginal cells; hind wings with but one middle cell. Wings expand 
about one inch. (Say.) 
81. Nematus sp. 
Order Hymenoptera ; family Tenthredinid^e. 
This feeds upon the leaves late in September at Providence. It is 
a large saw-fly larva of the following appearance : 
Larva. — Head black, body pale yellowish green with two subdorsal rows of eleven 
large black spots. Tip of body also black, two la teral rows of black spots, the lower 
one the smaller. Length 22 mm . 
82. Selandria sp. 
I have found the larva described below feeding on the leaves of the 
poplar-leafed birch in August and September at Brunswick, Me. 
Larva. — Body flattened ; lateral ridge very large and prominent, spreading out on 
the sides, the edges scalloped. Head honey-yellow, with two large patches behind 
on the vertex : eyes and jaws black. Body pale honey-yellow, with a d< rsal green 
patch on the thoracic segments. Length 10 mm . 
83. Nematus ? sp. 
(Larva, PI. IV, fig. 11.) 
The gregarious larva of this unknown saw-fly occurs in abundance on 
the white birch at Brunswick, Me., in August. As yet I have been 
unable to rear it, though one spun a cocoon September 2. The body is 
yellowish, with five or six rows of large conspicuous black spots. 
The following notes on the beetles found living on the leaves of the 
birch are taken bodily from Mrs. Dimmock's "Insects of Betula in 
North America," published in Psyche, iv, pp. 283-285. It should be 
