23.6 Schultze: Pachyrrhynchus 621 



per bus Heller) , the exact locality of which is not known, but I 

 suspect it was collected in northern Luzon. 



3. Macrocyrtus Heller is represented by 12 species, all of 

 which are found in northern Luzon. 



4. Eumacrocyrtus Schultze, with only 1 species, Negros. 



5. Proapocyrtus, Schultze, with only 1 species, Panay. 



6. Apocyrtus Erichson, with 2 species, Luzon. 



7. Pseudapocyrtus Heller, with 8 species, 6 of which are found 

 in Luzon, the others in neighboring islands. 



8. Nothapocyrtus Heller, with 7 species, all of which are 

 found in northern Luzon. 



9. Metapocyrtus Heller contains about 118 (156) species 

 and is found in practically all the islands of the Philippines, but 

 about 40 per cent of the species are found in Luzon. 



10. Homalocyrtus Heller contains at present 8 species (16, see 

 Table 2) most of which are scattered over the various islands of 

 the Philippines. 



11. Pantorhytes Faust, with about 20 species, which are 

 found in the New Guinea region. 



12. Sphenomorpha Behrens contains about 9 species, of which 

 7 are found in the New Guinea region and 2 only in the Moluccas. 



13. Apocyrtidius Heller, with 1 species, is found only in 

 Borneo. 



In order to demonstrate more clearly the general distribution 

 of genera and species of pachyrrhynchids involved I have pre- 

 pared Table 2; 8 the particular distribution of species and sub- 

 species of the genus Pachyrrhynchus is given in Table 3. 



Table 2 shows clearly that the center of dispersal of the 

 pachyrrchynchids is the Philippine Islands, particularly Luzon. 

 Table 3 shows localities of 85 species and 13 subspecies of 

 pachyrrhynchus. 



"The numbers of species as indicated in Table 2 for the large genus 

 Metapocyrtus and the genus Homalocyrtus are only tentative or approxi- 

 mate for demonstration purposes. The actually known number of valid 

 species of Metapocyrtus at the present time is about 104, for several of 

 which the exact locality is not known. In the collections at my disposal 

 I have about 156 species of Metapocyrtus from the Philippines, which fact 

 indicates how necessary a revision of this genus is before any definite 

 conclusions can be reached. The genus Homalocyrtus contains at the 

 present time about 8 known species but among my material of this genus 

 I have 16 species from the localities as indicated in Table 2. Therefore, 

 all figures in Table 2 with an x indicate that at least the given number 

 of species is known from that locality, irrespective of whether they have 

 been determined or are new. 



