REPORT OF THE ENTOMOLOGIST. 145 



The Lirvre appear to attain their full size in about five to seven days 

 after hatching; certainly less than or not more than ten days. There 

 appear to be but three molts or changes of skin, i. e., four stages of the 

 larvae. In casting the skin, the head splits open along the median line 

 of the vertex, and the epicranium or sides of the head split apart on each 

 side, leaving the clypeus and labrum in place; then the body is drawn 

 out of the rent, the skin adhering to the needle or leaf. 



DESCRIPTION. 



The egg. Slender, cylindrical, tapering rapidly towards each end. Length, 1.2 mm . 



Larva at the time of hatching. The head very large, much wider and higher than the 

 body before the latter fills out from eating; dusky or smoky green, not black, darker 

 in front on the clypeus and labrum than elsewhere; eyes black; thoracic legs smoky 

 green. Body uniformly poa-green; the head and thoracic legs soon become darker, 

 and the body fills out and becomes a little larger after the larva has taken food. 

 Length, 3-3.5 Ir:a . 



Larva after the first molt. Body pale green, without the glaucous pearly bloom of 

 the two luter stages ; head and thoracic feet black ; the segments wrinkled as in the 

 adult; but the short black spines of the two later stages are not to be seen. Length, 



Larva after the second molt. It now has the peculiar glaucous-green bloom of the 

 adult on the upper part of the body, the body being pale pea-green beneath and low 

 down on the side, while the black spines on the abdondn il segments are distinct and 

 arranged as in the full-fed worm. Length, 12 mni . 



Larva of fourth and last stage (PL III, Fi^. 16). Length at first, 14-16 mm . Body 

 with three pairs of black thoracic and seven pairs of abdominal legs, the color of the 

 uuder side of the body. (The Jarva may be distinguished from Lophyrus worms by 

 having one pair less of abdominal legs, the latter having eight pairs.) Body rather 

 long and slender; less plump than in the Lophyrus abietis. Head round, jet-black (it 

 is usually reddish in Lophyrus) ; seen from in front, regularly circular, mandibles 

 4-toothed; maxillae 4-jointed, the joints longer than in Lophyrus; the mala or inner- 

 most lobe broad and large at tbe end, with about ten stiff 'long seta) (in Lophyrus the 

 mala is much smaller, with only three very short setae or stiA spines). The body is 

 of a peculiar glaucous-green color, like that of the under sido of the leaves; the glau- 

 cous-green dorsal region is plainly separated from the paler under side of the body by 

 a definite line. There are no lateral stripes or spots. The first three (thoracic) 'seg- 

 ments behind the head are plain, with no minute warts; but around each abdominal 

 segment except the last run two parallel double rows of minute dark dots or warts, 

 but with no minute short hairs as are seen in Lophyrus abietis, while the supra-anai 

 plate is free from such dots and hairs. Length just before transformation, 18 mm . 



The worm is at once distinguished from any other saw-fly larvas, on pines, spruce, 

 and firs, by its larger size, its color, and by its jet-black head and its seven pairs of 

 abdominal legs. 



Cocoon. Larger and darker than that of Lophyrm abietis. Length, 10 mm ; diame- 

 ter, 5 mm . 



The imago or saw-fly (5 females). A very large, thick-bodied, black species, with 

 abdominal segments 2 to 5, and part of the sixth bright resin-red. 



Head black ; maxillary and labial palpi pale whitish flesh-color. Antennae tapering 

 to the end, black, 9-jointed; the scape with two small short joints, the second shorter 

 than the first; the flagellum 7-jointed, the second joint considerably shorter than the 

 first, and slightly longer than the third; the two terminal joints of equal length and 

 slightly paler than the rest of the antennae. The clypeus and especially the labrum 

 covered with white, stiff, short hairs, as also the genaa in front. Head and thorax 

 uniformly black, under the triplet seen to be pilose. Basal segment of the abdomen 

 black, segments 2 to 5, bright resinous red, including the basal third of the 6th, this 

 segment beneath being entirely red. 



First and second pair of legs, including the trochanters, pale fresh-color, the femora, 

 however, somewhat reddish and tipped at the distal end above with black; the third 

 pair of femora red, like the abdomen, black at tip; tibiaa pale, black on the outer 

 third; tarsi black, the under spines pale, including the base of the claws. End of 

 abdomen and ovipositor black. Wings with the costa as far as the stigma reddish; 

 stiguia and veins black. Only three subcostal cells, the basal squarish, one not being 

 completed, a short obsolete vein projecting from near the stigma. 



Length of body, llmm . o f antenna, 6.5 mm ; of fore wing, 9 mni ; expanse of win^s, 20- 

 21"" n . One specimen considerably smaller than the others. 



10 A '83 



