INTRODUCTORY REMARKS. 
ALTHOUGH strictly an enumeration of the Madeiran Coleoptera 
contained in the British Museum, the present Catalogue has the 
advantage of being also a general one; for, through the liberality of 
the only three gentlemen (Messrs. Bewicke, Mason, and Ross) who 
happened to possess what I could not myself place there, I am glad 
to have it in my power to state, that every species which has been 
hitherto detected in those islands is now represented in the National 
Collection. 
Exactly 100* species (63 of which I have regarded as new to 
science) have been brought to light, in the Madeiras, since the pub- 
lication of the Insecta Maderensia, in 1854 ; three moreover (T’rechus 
levis, Ellipsodes oblongior, and Stenus fulvescens) have been added, 
which I had looked upon, up to that date, as mere modifications of 
others ; whilst five forms, which, from insufficient evidence, I had 
described as species (viz. Tarphius spinipes, Ptinus longicornis, 
Atlantis lawripotens and austrinus, and Stagonomorpha unicolor), 
have been treated as varieties: so that the total nwmber is now 
augmented (from 482) to 580. 
As would of course be anticipated, these 580 species are composed 
of insects which are partly indigenous and partly introduced ; and it 
is only by a careful observation of them in situ, and a close inquiry 
into their various habits, that it can be decided to which of these 
two classes the several creatures belong. In some instances indeed 

* Of these 100 additions, I may observe that 14 (viz. Dromius alutaceus and 
plagiatus, Rhyzophagus bipustulatus, Silvanus unidentatus, Cryptophagus sagi- 
natus, Tomicus erosus, Acalles festivus, Blabinotus Bewickii, Longitarsus fractus 
and excurvus, Rhyzobius oculatissimus, Homalota montivagans, Philonthus 
punctipennis, and Lithocharis debilicornis) were discovered by Mr. Bewicke ; 
five (viz. Cercyon litorale, Pogonocherus hispidus, Hypophleus ambiguus, He- 
lops subdepressus, and Homalota alutaria) by Mr. Mason ; two (viz. Olisthopus 
acutangulus and Bembidium dubium) by Mr. M. Park ; one (Cassida Rossii) by 
Mr. J. J. Ross ; one (Formicomus pedestris) by Mr. EK. Leacock ; one (Tomicus 
perforans) by Mrs. Phelps; and the remaining 76 by myself. 
