Dorytomus and EUeschus. 311 



2. D. Tremula, Payk., Gyll., Steph., Schonh. 

 — fumosus, Rossi, sec. Gyll. et Schonh. 

 — vecors, ^, Schonh., Steph. Man. 



Described by Gyllenhal in his ' Insecta Suecica,' and by Ste. 

 phens in his ' Illustrations.' The male differs from the female 

 in having the rostrum distinctly ridged and deeply striated, the 

 antennae inserted nearer the apex, and the anterior tibise dilated 

 in the middle internally, the part dilated forming an obtuse tooth 

 or tubercle. The female differs from that of D. vorax in having 

 the rostrum shorter, smoothish, more shining, and in haying the 

 elytra very faintly punctate-striate ; the thorax moreover is much 

 broader than long, sometimes as broad or broader than the 

 elytra, greatly dilated and rounded at the sides, and the legs are 

 distinctly shorter and thicker. Eeadily distinguished from the 

 large individuals of D. costirostris by the thorax being consider- 

 ably broader— in other respects it resembles that insect. Length 



3 lines. . 



I forwarded to Schonherr two specimens of the present insect, 

 marked as D. tremulce, with a note of doubt, and these were re- 

 turned as " Erirhinus tremulce verus." Subsequently two other 

 specimens of the same insect being forwarded by myself to 

 Dr. Germar, that entomologist informed me that they agreed 

 with specimens which he had received from Schonherr bearing 

 the name E. vecors. Dr. Germar, moreover, upon returning my 

 insects, kindly provided me with a foreign typical example of the 

 so-called E. vecors— the whole are undoubtedly males of one and 

 the same species. I may further observe that I possess two spe- 

 cimens of this insect which were sent me by M. Chevrolat as the 

 Er. tremulce of Schonherr. i t j- 



I believe this rare insect was unknown as British until 1 dis- 

 covered it ; the females of the preceding, and the large specimens 

 of the following, having previously been mistaken for it. 



Found on young aspens {Populus tremula) at Birch Wood, and 

 likewise at Swanscomb Wood, near Gravesend, in the latter end 

 of June. " On Lombardy poplars, Knaresborough, Yorkshire ; 

 near Carlisle," T. C. Heysham, Esq. 



3. D. costirostris, Schonh. 



— Tremulce, Steph. sec. ej. INIus. 



— bituberculatvs, Zetterst., Schonh. 



Elongate, black, variegated with ferruginous, and clothed with 

 cinereous pubescence. Head small, subglobose, piceous, punc- 

 tulated, and densely pubescent between the eyes ; rostrum rather 

 thick, curved, black, glossy, carinated, and profoundly sulcated 

 from the base to the apex. Antennse ferruginous. Thorax 



