alogue published by
Dr. Hagen, and containing descriptions of the species named by him or by
M. Nietner. They were found in the most elevated parts of the island,
near Rambodde, and Dr. Hagen informs me that not less than 500 species
have been noticed in Ceylon, but that they are not yet recorded, with
the exception of the species here enumerated. It has been remarked that
the _Trichoptera_ and other aquatic _Neuroptera_ are less local than the
land species, owing to the more equable temperature of the habitation of
their larvae, and on account of their being often conveyed along the
whole length of rivers. The species of _Psocus_ in the list are far more
numerous than those yet observed in any other country, with the
exception of Europe.

Order HYMENOPTERA.

"In this order the _Formicidoe_ and the _Poneridoe_ are very numerous,
as they are in other damp and woody tropical countries. Seventy species
of ants have been observed, but as yet few of them have been named. The
various other families of aculeate _Hymenoptera_ are doubtless more
abundant than the species recorded indicate, and it may be safely
reckoned that the parasitic _Hymenoptera_ in Ceylon far exceed one
thousand species in number, though they are yet only known by means of
about two dozen kinds collected at Kandy by Mr. Thwaites.

Order LEPIDOPTERA.

"The fauna of Ceylon is much better known in this order than in any
other of the insect tribes, but as yet the _Lepidoptera_ alone in their
class afford materials for a comparison of the productions of Ceylon
with those of Hindostan and of Australasia; 932 species have been
collected by Dr. Templeton and by Mr. Layard in the central, western,
and northern parts of the island. All the families, from the
_Papilionidoe_ to the _Tineidoe_, abound, and numerous species and
several genera appear, as yet, to be peculiar to the island. As Ceylon
is situate at the entrance to the eastern regions, the list in this
volume will suitably precede the descriptive catalogues of the
heterocerous _Lepidoptera_ of Hindostan, Java, Borneo, and of other
parts of Australasia, which are being prepared for publication. In some
of the heterocerous families several species are common to Ceylon and to
Australasia, and in various cases the faunas of Ceylon and of
Australasia seem to be more similar than those of Ceylon and of
Hindostan. The long intercourse between those two regions may have been
the means of conveying some spec