312 Mr. J. Walton on the British species of 



broader than long, narrowed and impressed in front, greatly 

 dilated and rounded at the sides, somewhat pulvinated above, 

 thickly punctured towards the sides, and rather remotely punc- 

 tured on the disk, entirely black or piceous, or with the base and 

 apex ferruginous. Elytra oblong, the shoulders elevated, the 

 sides straight, more than three times the length of the thorax, 

 punctate-striate, more or less distinctly bituberculated poste- 

 riorly, either totally fuscous-black or variegated with ferruginous ; 

 unequally clothed with depressed cinereous hairs. Legs rather 

 long, stout, ferruginous or obscure piceous ; femora robust, cla- 

 vate and armed with a strong tooth within ; the joints fuscous- 

 black, and the basal half of the tibiae occasionally piceous-black. 

 Length 2|-3 lines. 



Extremely variable in size and colour; the major part of the 

 specimens being much larger than any of the following species. 



I possess seven foreign specimens of D. costirostris from 

 Schonherr, Gemiar and Chevrolat, and two of D. bituberculatus 

 from the first-named author, all of which are specifically identical 

 with my series of this insect. 



I have received many specimens of D. costirostris from the 

 Kev. Wm. Little taken in Scotland, but not accompanied with 

 any of D. maculatus; also from Mr. R. N. Greville, who found 

 them rather abundantly on the Lombardy poplar near Edin- 

 burgh. On young aspens [Populus tremula), Swanscomb Wood 

 near Gravesend, Windsor Forest, and other places in June, but 

 not found on willows. 



4. D. maculatus, Marsh, sec. Steph. 

 — fumosus, Steph. 111. 

 — Caprece, Chevr. in litt. 



Described by Mr. Stephens in his ' Illustrations ' under the 

 name of D. fumosus of Rossi, which he refers to maculatus of 

 Marsham ; he has however sunk it in his ' Manual ' as a variety of 

 TremulcB ; it is however decidedly smaller than the two preceding 

 insects, appears earlier in the spring, and is constantly found 

 upon a different plant. Although small individuals of D. costi- 

 rostris agree nearly in size with D. maculatus, yet the greater 

 part of the former are much larger than the largest of the latter ; 

 but I must state it is exceedingly difficult, between specimens of 

 equal magnitude, to find satisfactory distinguishing characters, 

 consequently I have separated them with some hesitation. Length 

 l|-2l lines. 



M. Chevrolat sent me two insects under the name of Caprea, 

 which he regards as a new species ; they are however the D. ma- 

 culatus of Marsham. 



Common in the south of England on willows, appearing as 



