44 The Philippine Journal of Science i9is 



comments on little-known species of this family. The material 

 of some myodochid genera rich in species (such as Pamera, 

 etc.) still remains to be studied and will be reported upon in 

 some future paper. The value of Professor Baker's collections 

 is enhanced by the fact that the small forms have been by no 

 means neglected, the most numerous and important additions 

 to the Philippine heteropterous fauna belonging in fact to the 

 small Myodochidge and Tingidse. 



From the fact that Semper's collections were made during 

 six years and from the material communicated by Professor 

 Baker it is evident that the hemipterous fauna of the Philippine 

 Islands is not nearly so rich and varied as that of New Guinea, 

 Borneo, and Sumatra; and it must be borne in mind that the 

 Hemiptera of these three islands are still to a great extent 

 undescribed. When the extensive collections made by Biro and 

 Loria in New Guinea and by Modigliani in Sumatra and the 

 material stored in several museums have been fully worked out, 

 the additions to the hemipterous fauna of these islands will 

 be very considerable. Yet the Philippine fauna, judging from 

 the Heteroptera alone, seems to be decidedly richer than that 

 of Celebes and approximately equal to that of Java. When 

 collections have been made in all the numerous islands composing 

 the Philippine Archipelago, I suppose the number of Heteroptera 

 until now found, principally by Semper and Baker, will be 

 about trebled. 



With the material now at hand I am under the impression 

 that many species, especially among the endemic ones, are 

 restricted to rather small areas. Certain species common in the 

 Laguna district, near Manila, have not been found in the 

 northern part of Luzon, and collections from Mindanao and 

 Palawan are different both inter se and from those made in 

 Luzon. Naturally, several species are more or less widely dis- 

 persed in the Indo-Malayan Region, and these convey the im- 

 pression that the Philippine Archipelago as a whole has a 

 hemipterous fauna more nearly related to that of Java than to 

 that of Borneo and that many forms common to Borneo and 

 Palawan have not reached Luzon. It is probable that the land 

 bridge of yore, supposed to have united Borneo with Luzon, 

 was disconnected between Palawan and Luzon long before the 

 land connection between Mindanao and Java-Celebes had sunk. 

 Among the Hemiptera very few forms point to the existence of 

 an ancient land connection between Luzon and Formosa-China; 

 and the few species previously known only from continental 

 Asia (chiefly India and the Malay Peninsula), but later found 



