2O0 MAINE AGRICULTURAL EXPERIMENT STATION. I9IO. 



work of the third generation. I am inclined to think that this third 

 generation will be found to have a different habit, possibly feeding upon 

 some other part of the tree, without forming galls, and producing in 

 time the true sexual individuals, something as in the case of the seventh 

 generation of ,5". americana. At all events, the true female (Fig. 129, b) , 

 with the solitary egg, is to be found about the trunk of the tree, as al- 

 ready described. 



"Descriptive. 



■"colopha ulmicoea. 

 "Byrsocrypta ulniicola, Fitch 4th (sic.)* N. Y. Rep. 1858, p. 63, 

 (§ 347)- — Thelaxes ulniicola, Walsh. Proc. Ent. Soc. Phil. vol. i, 

 p. 305, 1862 ; American Entomologist, Vol. i, p. 108, 1869. — Colopha 

 iilmicola, Monell, Canadian Entomologist, vol. ix, p. 102, 1877. 



"Impregnated or winter egg (Fig. 129, b). — Length 0.38 mm, perfect- 

 ly ovoid, shining olivaceous, inclining to brown, with no particular sculp- 

 ture. 



"First generation, or stein-mother. — 0.4 mm. long when hatched. 

 Antennae 4-jointed, joints subequal in length and thickness, but with 

 the bases of hairs rather strong. Promuscis very short, reaching only to 

 middle coxae or a little beyond. Upper tarsal hairs globate at tip and 

 as long as tarsus. Smooth, dark olive-brown in color with black mem- 

 bers. After first molt, the beak is still relatively shorter, as also the 

 tarsal hairs ; the color is paler, but the members are still black. She 

 measures i mm. in length when beginning to bear, and the third joint 

 of antennae is then somewhat clavate (Fig. 129, g), and as long as joints 

 I and 2 together ; the 4th narrower, as long as 3d, and rather truncate 

 at tip, with two rather conspicuous piliferous prominences. Color trans- 

 lucent yellowish-green, often inclining to purple. 



"Second generation. — 0.4 mm. long when born (Fig. 129, c) ; nearly 

 five times as long as wide; the antennae (Fig. 129, h) short and 5-jointed, 

 the joints subequal in length, the 3d shortest and narrowest, th-? 5th 

 swollen and sub-fusiform, with rather strong bulbs at the base of the 

 hairs. Promuscis reaching to hind coxae. Distinct globate tips to the 

 four tarsal hairs. Color pale olive-green, with black members and a 

 dusky stripe on the notum. Pupa (Fig. 129, d) with antennae smooth, 

 6-jointed, joints subequal in thickness, joint 4 only as long as 2 ; 5 c^nd 6 

 each twice as long ; 3 four times as long. Color dingy orange, with a 

 paler band around the thorax, embracing the wing-pads, and reminding 

 one, on this account, of the pupa of Phylloxera. Winged female CFig. 

 129, e) : Average expanse 3.7 mm.; the form of body more as in 

 Phylloxera, the abdomen tapering and narrower than the thorax, bear- 

 ing from ten to twenty pseud-ova. Blackish, with an olive green, tint, 

 the abdomen and under surface yellowish-green in the fresher individ- 

 uals. Antennae (Fig. 129, f) reaching only to insertion of front wings, 

 6-jointed; joints 4, 5, and 6 subequal, and together equal to 3 in length. 



*5th. 



