REPORT OF THE STATE ENTOMOLOGIST I9QI2 105 
upon elm and willow. This European sawfly is about half the size 
of the Cimbex referred to above and may be recognized by its nearly 
uniform, black color and the dull rufous tarsi. The body is about 
three-quarters of an inch long, the wing spread one and one-half 
inches ; the head, thorax and the base of the abdomen are thickly and 
irregularly clothed with rather long, tawny hairs. The general 
characteristics of the adult-are shown in the accompanying figure. 
The cocoon is about three-quarters of an inch long, subcylindric, 
with rounded ends, the posterior usually being narrowly so. The 
walls of this cocoon are composed of yellowish or tawny, matted 
silk more or less covered with foliage. The insect escapes by fore- 
ing off a lid at the broadly rounded anterior extremity. 
The young larva, according to Cameron, has 
a black head and a green body, the color usually 
being concealed by a powdery, whitish excretion. 
The full-grown larva is bright greenish yellow 
with a darker dorsal line. The yellowish head 
has a large, brownish orange mark on the vertex. 
The legs are pale whitish green, the claws brown 
and the spiracles reddish. The skin is covered 
with minute warts and sparsely dusted with a 
white powder. 
The hawthorn is given as the preferred food 
plant, though judging from the synonomy it also 
occurs upon birch. We have followed Gillanders 
in the use of tibialis as the specific name, 
though Cameron assigns this, together with 
leucorum Westw. and crataegi Br. & 
Zad. as synonyms of betuleti Klug. Owing 

to this species being restricted in its food plants 
to species of relatively small economic value, it is — Fig 15 Cocoon 
hardly likely that it could become, even if estab- Of hawthorn saw- 
; A — ; : fly (original) 
lished, a serious pest in America. 
Neuroterus saltatorius Hy. Edw. A white oak leaf bearing 
numerous specimens of this interesting gall, a globose, unilocular 
swelling less than 1 mm in diameter and on the under side, was 
received under date of July 24, 1912 from Mr R. M. Taylor, in- 
structor in pathology, Michigan Agricultural College, Ann Arbor, 
Mich. Mr Taylor called attention to the snapping or jumping habit 
of the galls, and careful listening enabled us to detect a low snap- 
ping or crackling, evidently due to the activity of the insect within 
Ss) 
the gall. This was easily demonstrated at a distance of an inch or 
