THE JUMPING PLANT LICE OF THE PAL^OTROPICS 
AND THE SOUTH PACIFIC ISLANDS 
FAMILY PSYLLID7E, OR CHERMIDA3, 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 Pauropsyllinse and Carsidarinse 
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 faunae 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 
Aphidida; and much less than the Coccidse. A few species in 
the Palaeotropics 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 Psylln isitis (probably the same as Arytaina punc- 
tipennis Crawford ’12: 431) is a pest on indigo; and Euphctlerus 
citri, on citrus trees. The habits of the majority of the species 
herein described are unknown. 
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