96 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxi. 



LARVA. 



;E(ig. — Much flattened, round, with a rim-like margin; ribs distinct, 

 some confluent as they diminish in number toward the vertex, wavy, 

 about sixty on the edge; micropyle irreguhirly ridged; cross lines just 

 perceptible in certain lights; shell colorless, white; diameter, 0.7 mm. 



8ta(/c I. — Body glassy, colorless; food green. Tubercles colorless, 

 normal, I to A' present, VI absent, 1 and II in a square on joint V2. 

 Setae single, long, pale. Leg i^lates concolorous, with three setae. 

 Width of head, 0.3 mm. 



Sf(u/c IT. — Width of liesid, 0.4 mm. Colorless ; food green ; faint white 

 spots along warts II. Warts normal, VI present, rather elevated, each 

 with a seta and crown of shorter ones. Hair pale, some dark ones 

 dorsally. 



Stage III. — Whitish; food green; width of head, 0.6 mm. A row of 

 white subdorsal spots along warts II, all as before. 



Stage IV. — Green, warts II broadly white; head whitish; width, 

 about 1 mm. (calculated, 0.86 mm.), bilobed. Hair black and white, 

 very h)ng. Warts conic, with a crown of soft hairs. 



Stage 1'. — As before, darker green, but still pale. White patches 

 over warts I and II distinct, somewhat oblique. Hair long, dark dor- 

 sally; some scattered pale secondary ones on the body, most numerous 

 subventrally. Width of head, 1.2 mm.; wart IV small. In male lar- 

 vae the sex glands show plainly in joint 9, whitish. 



Stage VI. — Head bilobed, rounded, green, with pale setae; no angles 

 nor tubercles; width, 1.8 mm. Body thick, round, joint 12 a little 

 enlarged, segmental incisures all well marked. Warts small, with fine 

 hairs, normal, IV very small. Hair long, black from warts I to III, 

 shorter and white from V and VI. Body green ; a broad yellow subdor- 

 sal line, covering warts II, broken in the incisures. Toward the end of 

 the stage the dorsal space is dotted with purple brown along warts I, 

 but not continuously. 



Stage VII. — Head slightly bilobed, green, a reddish-brown shade 

 over the vertex of each lobe; ocelli and jaws dark ; width, 2.4 to 2.6 mm. 

 Body elevated at joints 4 to 7 in position of rest, head held down, joint 

 12 a little enlarged dorsally. Hairs few, black from warts I to III, the 

 rest pale, with a few short, fine, dark secondary ones. Green ; a narrow, 

 broken, yellowish- white subdorsal line along warts II; wart I shaded 

 with i)urplish brown in the area just around it, especially on joint 12, 

 but all the shading rather faint. Spiracles dark brown, small. The 

 dorsal shading may be more extensive, suggesting the filling in of the 

 dorsal space, but not comi)lete. 



Food plants. — Birch, mountain ash, apple. 



[Note. — .icroin/cla mhiella Dyar {Apatcla mineUa Dyah, .lonrn N. Y. Ent. Soc, 

 1898, VI, p. 41) was published too late for full treatment here j 



