416 
ZOOLOGICAL LITERATURE. 
lected by Wallace in the Eastern Archipelago, which is in- 
tended to occupy the whole of the third volume of the ^ Trans- 
actions of tlie Entomological Society of London.^ The first 
part appeared in September 1864. He calculates the number 
of species at nearly a thousand, of which fully 800 are probably 
undescribed. The results of these investigations as regards the 
geographical distribution of these insects will form the subject 
of a concluding summary by Wallace; but in his introduction 
Pascoe dissents from the views held by Wallace as regards the 
zoological geography of the Malayan archipelago, at least as 
far as the Longicornia are concerned. Wallace holds that the 
Avestern islands of the archipelago belong to the Indian and the 
eastern islands to the Australian region, the Asiatic and Aus- 
tralian regions finding in Borneo and New Guinea respectively 
their highest development.^^ Pascoe states (/. c. p. 2) that he 
has not been struck by any special differences in the Longicornia 
between the eastern and western parts of the archipelago. On 
the contrary, there is a complete dissimilarity between the Aus- 
tralian Longicorns and those of the Eastern archipelago, in- 
cluding New Guinea. In illustration of this statement he gives 
a table of ten of the largest genera in Wallace's collections, 
shoAving the number of Malayan and Australian species : — 
Malayan. 
Australian. 
Remarks. 
Sybra 
23 
1 
Astathes 
26 
0 
Callichroma . . . 
29 
1 
Taken only once. 
Monochamas . . . 
45 
5 
r 1 widely distributed, 
1 1 doubtful. 
Obeirea ...... 
47 
0 
Tmesisternus . . . 
52 
0 
Ropica 
54 
2 
Praonetha .... 
56 
1 
Clytus 
77 
6 
1 doubtful. 
Glenea 
108 
0 
As regards the classification of the Longicornia, Pascoe 
follows Leconte in dividing them into three families, namely, 
Lamiidae, Cerambycida3, and Prionidae, which are again divided 
into numerous subfamilies [vide infra), Pascoe has also some 
remarks upon the complicated divisions introduced into the 
classification of insects, and upon the uncertainty of the value 
to be attached to groups having the same names in the writings 
of different authors. The discrepancy* of which he complains is 
the result of the difference which must exist between the views 
of individual writers, and could only be got rid of by the adop- 
