The Philippine Journal of Science 1923 



actual obser- 



GENERAL DISTRIBUTION OP THE PACHYRRHYNCHIDES 



The pachyrrhynchids in their geographic distribution contrast 

 greatly to the other curculionids, all other Coleoptera families 

 and, in a general way, also nearly all other insect orders, even 

 mammalians, reptilians, fishes, and plants, in their almost com- 

 plete alliance with those of the eastern Malaysian and Papuan 

 regions. This is particularly noteworthy and of great signi- 

 ficance since the general alliance of the Philippine fauna and 

 flora is rather uniformly mixed ; that is, their alliance is with 

 both the western Malaysian and the eastern Malaysian regions. 



The pachyrrhynchids are even rather restricted in their gen- 

 eral distribution; by far the largest number of represen- 

 tatives are found in the Philippine Islands. I consider it certain 

 that surprisingly large numbers of species of pachyrrhynchids 

 will yet be discovered in the vast unexplored or only superfi- 

 cially known parts of the Philippines, particularly in the follow- 

 ing regions: The Batanes and Babuyanes groups of islands 

 between Formosa and Luzon, on all of which only very limited 

 collecting has been done ; northern Luzon, in the eastern moun- 

 tain ranges, near Mount Moises; Mindoro Island; most of the 

 Visayan islands; and central Mindanao. 



Actual entomological collecting has been carried on in prac- 

 tically all of the islands comprising the Philippine group. Much 

 more extensive collecting by many different persons has been 

 done in Luzon (with the exception of the areas above indicated) 

 than in any other island. 



The distribution of the respective genera and species of the 

 Pachyrrhynchides is as follows: 



1. Pachyrrhynchus is represented by about 85 species, of 

 which 81 are found exclusively in the Philippines and only 4 

 outside; namely, 1 in the Riu Kiu Islands, and 3 in the Moluccas 

 (Sangir, Ternate, and Halmahera). By far the larger number 

 of Philippine species is found in Luzon, and on this island the 

 larger number is found in the mountainous districts of the 

 northern half. Of the other Philippine species about 14 are 

 found in Mindanao and the rest are scattered over various 

 islands. 



2. Eupachyrrhynchus 7 Heller contains only 1 species (E. s«- 

 ' Eupachyrrhynchus hieroglyphic^ Schultze must be placed in the 



