REPORT OF THE STATE ENTOMOLOGIST IO,I2 



I05 



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 forc- 

 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 c r a t a e g i 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 

 hardly likely that it could become, even if estab- 

 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 

 the gall. This was easily demonstrated at a distance of an inch or 



Fig 15 Cocoon 

 of hawthorn saw- 

 fly (original) 



