88 THE ENTOMOLOGIST. 



Tenthredinid^e near York. — The following notes and 

 captures of Tenthredinidse have been made by me during the 

 seasons 1879 and 1880. I am, however, indebted to Messrs. 

 Fitch and Bridgman for naming them. They will, therefore, be 

 pleased to accept my sincere thanks for their kindness in so doing. 

 — Trichiosoma hetuleti, Kl. This species is perhaps scarcely 

 worth recording on account of its general abundance, but it 

 is nevertheless an interesting species, being one of our largest 

 sawflies. It abounds in the larva state on the hawthorn hedges 

 around here; its large size and white appearance render it a 

 conspicuous object. It is one, therefore, which may be easily 

 found by the hymenopterist. If we beat the hedges in 

 August or September into an inverted umbrella, we shall be 

 readily repaid by an abundance of the larva. When disturbed it 

 rolls itself up on the under side of a leaf, and will remain quietly 

 concealed there until the object of its alarm has gone. After 

 feeding for four or five weeks it then commences to construct a 

 dwelling for its winter quarters. It does not, like the larvae of the 

 lepidopterous group, roam about for a considerable time in search 

 of a place where it may safely rest, but, being full-fed, it sets to 

 work there and then on the same twig on which it had been 

 feeding, and makes a strong oval, leathery cocoon, something 

 similar to the cocoon of Eriogaster lanestris. In this home it 

 remains until the following May or June as a contracted larva. 

 It then changes to a pupa a few weeks before its emergence as a 

 perfect fly. Croesus septentrionalis, L., is not, I believe, a species 

 of general occurrence, though where it does occur it is found in 

 some abundance, from its being a gregarious feeder. It has 

 visited this locality during the years 1879 and 1880. I noticed it 

 upon alder, birch, and hazel in 1879, stripping the bushes; in 

 1880 I noticed it only on birch, but in greater numbers than in 

 the previous year. It takes firmly hold of its food-leaf with its 

 prolegs, and if in anywise disturbed it throws up its posterior 

 segments in self-defence. Its colour is pale green, with conspicuous 

 black subdorsal spots. When full-fed it descends into the earth 

 and spins a brown tough cocoon, and remains there until the 

 following June. The colour of the perfect fly is black, with 

 a broad bright red band on the abdomen. C. latijjes, Hart. — A 

 smaller species belonging to the same genus as the last. I met 

 with a dozen larvae on some birches in a hedgerow in 1879. It 



