Chap. XII.] LIST OF CEYLON INSECTS. 
445 
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 larva?, 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 Formicidce and the Poneridce are very 
numerous, as they are in other damp and woody tropical coun- 
tries. 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 Lepidop- 
tera alone in their class afford materials for a comparison of 
the productions of Ceylon with those of Hindustan and of 
Australasia ; nine hundred and thirty-two 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 Papilionidce to the Tineidce, 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 Hin- 
dustan, Java, Borneo, and of other parts of Australasia, which 
are being prepared for publication. In some of the heteroce- 
rous families several species are common to Ceylon and to 
Australasia, and in various cases the faunas of Ceylon and of 
