NEW BRITISH SPECIES, ETC., IN 1868. 63 



the posterior angles produced beyond the shoulders of the 

 elytra. 



Mr. Matthews re-describes the species. 



68. Trichopteryx OBSC^NA, Wollaston, Cat. Mad. Col., 

 p. 35, 1857 {Acrotrichis). 

 Guerinii, id., Col. Atlant., 100 (nee 



Allib.). 

 Rev. A. Matthews, I. c, p. 10. 

 Mr. Matthews also records the capture of Mr. Wollaston's 

 Madeiran species by himself in Sherwood Forest, in 1867 ; 

 and states his reasons for now considering it as distinct from 

 Gueriniif with which he formerly associated it. It belongs 

 to the group with pale or* rufescent elytra and the thorax 

 scarcely dilated at the base; and appears to differ from 

 Guermii in the comparative length of its elytra and in its 

 sculpture. 



69. ACTIDIUM, Matthews, Ent. M. Mag., vol. v, p. 12 

 (characterized). 



Mr. Matthews, loc. cit., gives diagnostic characters for a 

 new genus which he founds to include Ptilium transversale, 

 Er., P. concolor, Sharp, and P. coarctatum, Haliday, all 

 of which differ widely from Ptilium in every anatomical 

 detail, and for which the most obvious superficial distinction 

 will be found in the base of the thorax, which is not, as in 

 Ptilium proper, fitted to the shoulders of the elytra, but 

 overlaps and lies upon them, so as partly to conceal the 

 scutellum. 



There seems some doubt as to whether Thomson's elon- 



