162 Philippine Journal of Science i»» 



I attach a good deal of importance, taxonomically, to the clawlike 

 spines on the basal tarsus of the hind legs. In Psyllinae there 

 are two such "claws." in Triozinas none, while in Carsidarina? 

 there is one "claw." In Homotoma, however, there are usually 

 two and in Mycopsylla there appear to be two. In some other 

 respects, also, this is somewhat of an aberrant genus, but it is 

 retained in this subfamily, for the present at least. 



Key to the species. 



cr 1 . First marginal cell much smaller than second or wanting; radius and 

 media quite or nearly contiguous for a greater or less length; ptero- 

 stigma wanting. 

 b 1 . Medial vein contiguous with radius for about one-half length of 

 latter, leaving an open cell between them on costal margin. 

 c\ First marginal cell present; a black band following radius to 

 margin and another following cubitus. (Formosa.) 



H. radiatum Kuwayama ('08: 181). 

 c 1 . First marginal cell wanting; the two black bands wanting, but 

 radial vein prominently black. (Bengal.) 



H. distincta Crawford ('12: 433). 

 o J . Medial vein contiguous with radius for nearly or quite the entire 

 length of latter, leaving no cell or only a very small one between 

 them; a black band following radius and media, and a second one 

 following cubitus; first marginal cell present but small. 

 c\ Insect large, 6 millimeters long to tip of folded wings; antennse 

 terete, without carinas; costal margin of forewing roundly arched, 

 wing nearly half as broad as long. (Philippines and Straits Set- 

 tlements.) H. bakeri Crawford ('15: 263). 



c 2 . Insect smaller, about 3 millimeters long to tip of folded wings; 

 antennas carinate; costal margin of forewing much less arched, 

 wing about one-third as broad as long. (Philippines.) 



H. bilineata Crawford ('17: 164). 



a\ First marginal cell nearly as large as second; radius and media not 



contiguous; pterostigma present; wing veins margined with black; 



antennas carinate. (Philippines.).... H. pacifica Crawford ('15: 262). 



Homotoma baseri Crawford ('15: 263). 



A single male has been taken by C. F. Baker on Penang 

 Island, Straits Settlements. As the original description of this 

 species was drawn up from a female example, the male genitalia 

 are here described. 



Male. — Forceps as long as anal valve or longer, basal half 

 with a carina on outer face, distal half enlarged, somewhat 

 spearhead-shaped with tip bluntly rounded. Anal valve very 

 slender in distal half, base broader. 



Hind wings in both sexes very small and almost nerveless. 



