XV1 INTRODUCTORY REMARKS. 
pictus, Caulotrupis lucifugus, Tychius robustus, Laparocerus morio*, 
and Anaspis Proteus. If however we divide the Group into its three 
portions, and look upon the Dezertas as one of them, there are no 
less than 43 species which are universal. These also, therefore, we 
should of course imagine @ priori might be pronounced, emphatically, 
as indigenous : and so they appear to be, on referring to the Catalogue, 
for it will be perceived that only sia of them are there marked as 
having possibly reached the islands since the period when they were 
first colonized. 
Of the genera with which we have here to do, Homalota takes the 
lead (having 20 exponents); but Tarphius, which is next in point 
of extent (numbering 18 representatives, all manifestly aboriginal), 
is, when geographically considered, perhaps the most important. 
Acalles also (of which there are 16 members), and Atlantis (of which 
there are 12), are entirely made-up of endemic species; and Helops 
has 10 exceedingly indigenous ones (in addition to the H. pallidus, 
which is European). T'rechus likewise is largely expressed, 10 of its 
representatives (if not the whole 11) being endemic; and there are 
8 Ptini of a very characteristic type. Perhaps the most remarkable 
forms, however, are Elhiptosoma, Zargqus, Calobius, Cossyphodes, Hu- 
rops, Leiparthrum, Leipommata, Echinosoma, Xenorchestes, Deucalion, 
Gleeosoma, and Stereus. 
* This insect is registered in the European catalogues as occurring in Por- 
tugal, but I suspect that its claims for admission therein are, to say the least, 
extremely doubtful: on which subject, see my remarks in the Insecta Made- 
VENSUM. 
} Four genera only (viz. Elliptosoma, Leipommata, Stereus, and Autocera, 
—the first of which moreover was indicated, as a sub-genus, in the Insecta 
Maderensia) have been established in the present volume. 
