THE JUMPING PLANT LICE OF THE PALiEOTROPICS 

 AND THE SOUTH PACIFIC ISLANDS 



FAMILY PSYLLIDvE, OR CHERMID^E, HOMOPTERA 



By David L. Crawford 

 Of the College of Hawaii, Honolulu 



THREE PLATES AND THREE TEXT FIGURES 



Our knowledge of the psyllid fauna of the Old World Tropics 

 is gradually being extended, though it is far from complete. 

 It appears that the subfamilies Pauropsyllinae and Carsidarinae 

 are much more extensively represented in this part of the world 

 than in either the North or the South Temperate Zone, and 

 perhaps are the chief groups in numbers of species. 



This family is widely distributed and often numerously rep- 

 resented, even on the Pacific islands. Some very interesting 

 evolutional features are to be noted in the psyllid fauna? of 

 certain island groups. The most remarkable is that of the 

 Hawaiian Archipelago, where thirteen of the fifteen known 

 species are apparently derivatives of one species long ago 

 established here. Some of these species have diverged so far 

 from the ancestral type, a Trioza, that two other generic groups 

 embrace them. 



In the Malay Archipelago there is another interesting group, 

 Megatrioza. This genus of the Triozinse is most numerously 

 represented in this Archipelago but extends into the Philippines 

 and south into Australasia, and one species has found its way 

 as far as the Hawaiian Islands. Several other genera, more 

 fully treated on subsequent pages, appear to have sprung from 

 this one. 



Economically, this family is of less importance than the 

 Aphididse and much less than the Coccidse. A few species in 

 the Paleeotropics cause considerable damage, and no doubt when 

 the habits of certain other species are known the number of 

 economically important species will be augmented. 



Buckton's Psylla isitis (probably the same as Arytaina punc- 

 tipennis Crawford '12: 431) is a pest on indigo; and Euphaleriis 

 citri, on citrus trees. The habits of the majority of the species 

 herein described are unknown. 



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