MADEIRAN COLEOPTERA. 147 
doubly valuable ; and it would appear that he had regarded it as 
distinct from Clambus long before it was separated therefrom by 
M. Redtenbacher. It further appears from Mr. Haliday’s observa- 
tions, that in all the specimens which he had examined the feet 
were unquestionably tetramerous ; and that the hinder ones there- 
fore are not triarticulate, as stated by Redtenbacher,—who it is pro- 
bable (as he had but a single example of his C. alpestris to judge 
from) was mistaken as to the number of tarsal (as he clearly was of 
the antennal) joints. Regarding its affinities, it would seem, with 
Orthoperus, to be connective between the Clypeastres and the Aniso- 
tomide,—being more allied however to the latter, just as Orthoperus 
is to the former; and since it can scarcely be admitted into either of 
those families, as rigidly defined, I avail myself of Mr. Haliday’s 
suggestion, that it should be regarded as the type of a separate group, 
which we may denominate the Clambide. 
429, Calyptomerus dubius*. 
C. ovatus rufo-testaceus impunctatus pubescens, elytris antice valde 
postice minus convexis, basin versus picescentioribus, antennis 
(clavaé obscuriore excepti) pedibusque pallidis. 
Long. corp. lin. }. 
Scaphidium dubium, Mshm, Ent. Brit. i, 234 (1802). 
Clambus Enshamensis ( Westw.), Steph., Ill. Brit. Ent. ii. 184 (1829). 
Calyptomerus alpestris ?, Redt., Fina Austr. 159 (1849). 
C. ovate, reddish-testaceous (the head and prothorax being of a 
clearer colour than the elytra), pubescent, shining, and impunctate. 
Elytra very convex anteriorly (where they are of a duller, or more 
brownish-piceous, hue), but flatter towards their apex. Limbs 
(except the club of the antenne, which is darker) very pale, and 
fragile. 
Detected by myself, during the summer of 1855, in Madeira 
proper,—crawling on the damp inner walls of houses at 8. Antonio 
da Serra, Camacha, and Feijaa d’Ovelha ; and it is worthy of remark, 
that it is in somewhat similar positions that it is usually to be met 
with in more northern latitudes, and in company moreover with 
the very same insects,—viz. Orthoperus, the Mycetcahirta, and 
Lathridius +. 

+ However commonly associated in our own country, it is smgular that these 
self-same species should be met with in company even in the most remote of 
the inhabited districts of Madeira. Such insects as the Cryptophagi and Ptint, 
which are often found with them, are less remarkable in such positions, being 
liable to constant introduction everywhere ; but Calyptomerus and the Ortho- 
peri are not usually thus disseminated, and moreover, are more particularly 
attached to the inner walls of damp and neglected buildings. 
9 
La 
