CERAMBYCID^. 15'8 



of difference, especially in the sexual characters. In the male of C.ferus 

 the basal portion of the antennae is only a little thicker than in the 

 female ; in the female the front of the prosternum is more convex, and 

 the metathoracic episterna are considerably broader than in C. rusticus. 

 The under suiface is moi^e closely and finely punctured and pubescent, 

 and therefore less shining. The scutellum in G. ferus is never in the 

 least depressed along the middle, and the sculpture and pubescence of 

 the gular area are very different. In C. rusticus the tarsi have the third 

 joint divided almost to the base, and the setae on the eyes are very con- 

 spicuous, while in G. ferus the eyes appear to be bare, and the tarsal lobes 

 are less perfect. Superficially G. rusticus and G. ferics are very much 

 alike. L. 10-30 mm. 



As Dr. Sharp says, the variation in size is extraordinary, so much 

 so that it would take twenty or thirty of the small males to make up the 

 bulk of one of the largest females. 



First found in the New Forest in Scots' fir (Pinus sylvestris) by 

 Mr. F. Gilbert Smith, and introduced as British by Mr. Willoughby 

 Ellis under the name of G. j)olonicus, Mots. (Eut. Record, xv. 1903, 

 259) ; also taken in the same locality by Mr. Willoughby Ellis and Mr. 

 Donisthorpe ; also taken in 1909 by Mr. Champion on pines in the 

 Woking district, which had been injured by fire. The species often 

 varies (as G. rusticus) in several particulars, such as shape of thorax, 

 the depressions on its disc, the proportions of certain parts of the body, 

 the distance between the eyes on the underside of the head, the sculp- 

 ture, &c., but all the examples appear to belong to one species. 



The life history of the species has been carefully worked out by Mr. 

 F. Gilbert Smith, and the results of his obscivations are embodied in an 

 excellent paper on "The habits of Asemum striatum and Griocejjhalus 

 ferus" published in the Transactions of the Entomological Society for 

 1905, p. 165-176. 



TETROPIUM, Kirby. 

 Tetropium, Kirby (Faun. Bor. Amer. 174). Form subparallel, 

 rather robust, not convex ; head narrower than thorax, concave between 

 the antennae, antennae widely sepai-ated at base, rather short and 

 tapering, longer in the male than in the female, but in the former sex 

 scarcely longer than half the body; eyes almost completely divided 

 (hence the name of the genus) ; maxillaj short and bi-oad with the outer 

 one elbowed exteriorly ; labium slightly sinuate on its anterior margin 

 with the lateral angles produced ; thorax almost as long as broad, 

 strongly rounded at the sides, about as much nairowed in front as behind ; 

 scutellum rounded behind ; elytra almost parallel, with the apices 

 separately rounded, with more or less distinct raised lines ; prosternum 

 terminating in a sharp point between the anterior coxse and not 

 produced beyond them ; mesosternum very narrow ; legs comparatively 

 short and robust, with the femora claviform, somewdiat compressed, the 

 posterior femora being the longest. The insects belonging to this genus 



