ADDITIONS TO THE KNOWN PHILIPPINE DELPHACID^ 

 (HEMIPTERA) 



By Frederick Muir 

 (Hawaiian Sugar Planters' Association, Honolulu, H. T.) 



The Delphacidae have been greatly neglected by collectors, es- 

 pecially in the tropics. This is seen in the species previously 

 reported from the Philippine Islands, which amount to less than 

 one dozen. The present list brings the number up to forty. 

 This is but a small part of what will be eventually found. In 

 Prof. C. F. Baker's collection are several undetermined species 

 that I am unable to handle until my return to Honolulu, 



The lack of knowledge of this family is to be regretted, as 

 many of its species are of great economic importance. Were 

 it not for the host of parasites that keep these species in check, 

 many of our crops would be devastated. 



In working out the species of this family, it is absolutely neces- 

 sary to use the structural characters found in the male genitalia ; 

 especially is this the case in the complex of genera grouped about 

 Liburnia, and failure to do so will lead to great confusion. 



ASIRACIN^E 



Genus TJGYOPS Guerin 

 Ugyops Guerin, Voy. Belanger, Zool. (1834), 4, 477. 



Ugyops pictifrons Stal. 



Ugyops pictifrons Stal, Ofr. k. Vet.-Akad. Forh. (1870), 747. 



Mindanao and Basilan (Baker) . 



Ugyops impictus Stal. 



Ugyops impictus Stal, Ofr. k. Vet.-Akad. Forh. (1870), 748. 



Mindanao and Basilan (Baker) . 



Genus MELANESIA Kirkaldy 



Melanesia Kirkaldy, Ent. Bull. Hawaiian Sug. Plant. Assoc. (1907), 

 No. 3, 128. 



Melanesia gTanulata (Melichar). 



Ugyops granulatus Melichar, Phil. Journ. Sci., Sec. D (1914), 9, 175 

 (included, evidently inadvertently, in Cixiinae) . 



Both joints of antennae are longer and more slender than in 

 the type, but the short vertex and the tegmina place it in Mela- 



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