2 Lovgicornia Malayana. 



with, it will be desirable to make some remarks on the classification, 

 prefacing these, however, with a few words on the geographical 

 distribution of the species and their relations to the same families 

 belonging to the Indian and Australian faunas. Mr. Wallace him- 

 self will sum up the results and his views thereon at the conclusion 

 of the work. 



Our acquaintance with the Longicornia of the mainland of 

 Asia is very imperfect. India, to judge from our collections, has 

 generally a very meagre insect fauna ; but the researches of the 

 late M. Mouhot lead us to believe that a considerable proportion 

 of Malayan Archipelago forms are to be found in Cambodia and 

 Laos, but they probably do not extend in any numbers further 

 north. The Longicornia of Australia are sufficiently well known 

 to enable us to institute a comparison which, in its general re- 

 sults, can only lead us to one opinion, that is, the almost utter 

 dissimilarity between them and those of New Guinea and, d. fortiori, 

 of the rest of the Archipelago.* Throughout this work I shall 

 take every opportunity of contrasting the two, and shall not there- 

 fore dwell further on the subject at present, except to show, in the 

 following table of ten of the largest genera of the Wallacean col- 

 lection, the difference between the Malayan and the congeneric 

 species, whenever they occur, of the Australian Longicornia. 



Malayan. Australian. 



Syhrn 23 1 



Astatkcs 20 .... 



Callichronm 29 .... 1 Taken only on one occasion. 



Monochavnis 45 .... 5 1 widely distributed, 1 doubt- 



Oberea 47 ful. 



Tmesisternus 52 .... 



Ropica 54 .... 2 



Praonetlia 56 .... 1 



Chjtus 77 .... G 1 doubtful. 



Glcnea 108 



* It is held that the western islands of the Malay Archipelago belong to the 

 Indiin region, and the eastern to the Austrnlian. Mr. Wallace has asserted that 

 this holds good in every branch of Zoology (Proc. Linn. Soc. 1860, Zool. iv. 172). 

 " Borneo," he says, " is the counterpart of New Guinea," and " the Asiatic and 

 Australian regions fiiidin;^ in IJorneo and New Guinea respectively tiieir highest 

 development" (ibid, p. 174). On the whole I have not been struck by any 

 special differences between the western and eastern portions of the Archipelago, 

 so far as the Longicornia are concerned. Tmesisternus, the only exception I 

 know, is apparently confined to the eastern portion, but the sub-family of wiiich 

 it is the type has representatives in Sumaira, Java, Singapore, &c., as well as in 

 New Caledonia, the New Hebrides, New Zealand, Australia, the Fiji and other 



