20 MADEIRAN COLEOPTERA, 
within a mile of the actual spot in which it occurred. It is in some 
respects intermediate between the 7’. levis and dilutus, nevertheless 
the peculiarity of its colouring will at once separate it from them 
both; whilst, in addition to the other characters above enumerated, 
which serve to distinguish it from the former, it may be readily 
known from the latter by, inter alia, its somewhat shorter elytra 
(which are less narrowed about the shoulders), and by its much more 
quadrate prothorax. 
55. Trechus dilutus. 
Trechus dilutus +, Woll., Ins. Mad. 66 (1854). 
Inhabits the mountains of Madeira proper, occurring in wet places 
in company with the 7. flavomarginatus, though only at lofty eleva- 
tions. Rare. 
56. Trechus umbricola. 
Trechus umbricola, Woll., Ins. Mad. 67. tab. ii. f. 3 (1854). 
Inhabits the mountains of Madeira proper, occurring in the damp 
sylvan districts of intermediate and lofty elevations. 
57. Trechus quadricollis. 
Trechus quadricollis, Woll., Ins. Mad. 68 (1854). 
Inhabits the mountains of Madeira proper, and is hitherto unique, 
—the single example which has been as yet detected being in the 
British Museum. 
58. Trechus custos. 
Trechus custos, Woll., Ins. Mad. 68 (1854). 
Inhabits the mountains of Madeira proper, occurring abundantly 
throughout the sylvan districts,—though especially towards their 
upper limits. 
59. Trechus alticola. 
Trechus alticola, Woll., Ins. Mad. 69 (1854). 
Inhabits the mountains of Madeira proper, occurring in open grassy 
spots of the loftiest elevations,—the only locality in which I have 
hitherto detected it (and in which it has been also taken by Mr. Be- 
wicke) being an upland ridge between the Ice-House Peak and the 
Pico dos Arieros, 

+ In the description of this species, given in the Insecta Maderensia, atten- 
tion should have been called to the length of the antenne, which are distinctly 
longer than those of its allies. The size moreover might have been registered 
as slightly larger, some of the specimens which I have since obtained being 
nearly two lines in length. 
