CEYLONESE AND PHILIPPINE PSYLLID^E (HOMOPTERA) 



By D. L. Crawford 

 (Pomona College, Clar'emont, California) 



ONE PLATE 



The tropics of the Old World contain a host of interesting in- 

 sects, and many of them are still unknown to science. Two small 

 collections of Psyllidse, or jumping plant lice (Homoptera) , have 

 been recently received by me from two distinct parts of the 

 eastern tropics. One is from the Philippine Islands, sent by 

 Prof. C. F. Baker, of the College of Agriculture at Los Bafios, 

 and the other is from Ceylon, sent by Mr. Andrew Rutherford, 

 of Peradeniya. It is not surprising that some of the species are 

 found in both of these regions, and that several species in each 

 are very closely related to species in the other. A few species 

 of psyllids seem to be widely distributed throughout all the Asiatic 

 tropics, such as the citrus psyllid, Euphalerus citri (Kuwayama) . 



These two collections are not treated separately, for there are 

 several species identical in both. The Philippine collection con- 

 tains 23 species, most of which are new. The Ceylon collection 

 contains 4 species, one of which has already been described from 

 the Philippines, another is closely related to a Bengalese species, 

 and a third resembles another Philippine species. 



The descriptions of several species, mostly of the genera 

 Psylla and Trioza, are deferred until a later date. 



The type specimens are retained in my collection, awaiting 

 later disposal. 



A synoptic key of the genera thus far known to occur in the 

 Philippines is presented for facilitating the determination of 

 species. There are several other genera doubtfully represented 

 by a few undescribed insects in the collections before me, but 

 these will be added to the key at a later date. Also there are 

 several other genera in Formosa, Japan, and southern Asia which 

 may have representatives in the Philippine Islands as well. 

 This key, therefore, is simply temporary. 



Synopsis of the Philippine genera of Psyllidse. 



a\ Head deeply cleft in front between antennal bases. Antennae very thick 



at base and attached at apex of lobes, increasing the cleft appearance. 



Genffi may be produced beneath into lobes or cones. 



6\ Antennse very slender and long, not hairy. Vertex with a pair of 



horns between eyes. Genal cones wanting Dynopsylla. 



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