82 EDWARD NORTON. 



times have one of these galls ou about every half inch of their length, 

 and not placed in a regular row. 



Larva. — August 30. Many 0.10 — .12 inch long, imbedded in the 

 slit at the base of the gall, in other galls not hatched. Larva pale yel- 

 lowish, with a pale fuscous head and dark eye spots; removed from gall 

 it uses its legs freely. 



October 2. Many larvae still in galls, from others they had bored 

 out. 



April 16 — 27. Fifteen imagos, all transformed in the gall, the galls 

 gathered in March. 



Mr. Walsh mentions another gall found on S. humilis, which he 

 names S. ocidum. On this he found larvae, but failed to obtain the 

 imago. The gall is formed like the last, but the larv^ differ in color. 



3. E. s. nodus. 



Eaura s. nodus, Walsh, Proc. Ent. Soc. Phil, vi, 1861!, 253, %. 

 Length % 0.16—0.17 inch. Br. wings 0.34— .3!i inch. 



" % . Diifers from E. s. ovum only as follows : 1st. The pale color is 

 bright honey-yellow, not greenish-white throughout, i. e. both in an- 

 tennae, body and legs. 2d. The black spot enclosing the ocelli is larger 

 and is confluent with the eye for its entire length, leaving no orbit be- 

 tween them, 3(1. The venter (dried) is honey-yellow on the terminal 

 third and fourth joints, and in the middle only of one or two more. 

 Basal plates black as in £J. s. gemma. When recent the venter was 

 noted as being greenish and the legs as pale fulvous. 4th. The legs 

 (dried) are honey-yellow immaculate, except the extreme tarsal tips. 

 r)th. The basal half of the stgma is whitish as in E. s. ovum 9 • 



Two S. 



The gall is found on S. longifolia. -A mere gradual enlargement of 

 the twig, from one-fourth more than its normal diameter up to twice 

 its normal diameter, almost always without any roughness ou the ex- 

 ternal bark ; general color that of twig. 



August 28. When cut into, the interior of each gall is found to be 

 pithy, and to contain 1 — 3 larvte in separate cells. Frequently, on a 

 piece of twig six inches long, two, three or four of these galls are 

 placed at irregular intervals. Jjcngth 0.75 — 1.50 inch; dii.meter 0.10 

 — 025 inch. Described from thirty-one twigs. Very like the Ccci- 

 domyous gall S. nodiUus on the same willow, but is much larger. 



Larva. — August 28 the larva is 20-footed. Color pale greenish- 



