140 Philippine Journal of Science 1919 



A detailed description of the anatomy and the taxonomy of 

 the family, as a whole, is given in my monograph and need 

 not be repeated here. However, a key to the subfamilies rep- 

 resented in the Old World Tropics is included here for con- 

 venience. 



This taxonomic work is made possible chiefly through the 

 extensive collecting activities of Prof. C. F. Baker and of 

 Mr. Frederick Muir. 



Key to the subfamilies of the Psyllidte. 



a 1 . Frons usually visible as a small sclerite, bearing front ocellus; genae 

 seldom produced into processes; body short and robust; thorax 

 strongly arched, head strongly deflexed; coxal spurs short. 



Pauropsyllinas Crawford. 



a 2 . Frons covered by gena? and not visible, except a very narrow border 



around front ocellus; body usually more elongate; coxal spurs usually 



not very short. 



b l . Genal processes (cones) usually wanting and head deeply cleft in 



front between the antennae or, if head is not cleft, the forewings 



have one or two pseudo (cross) veins; body typically long and 



slender; forewings elongate and often with pseudoveins; basal 



tarsus of hind legs usually with only one clawlike spine at apex. 



Carsidarinae Crawford. 



6*. Genal processes (cones) usually present and head not cleft in front, 



except as the divergent genal cones may give the appearance of 



a cleft; forewings never with pseudoveins. 



c 1 . Forewings with cubital petiole (media and cubitus with a common 



stem) ; basal tarsus of hind legs with two clawlike spines at apex. 



Psyllinas Puton. 

 c 1 . Forewings usually without cubital petiole (the radius, media, and 

 cubitus all emerging from basal vein at the same point) • basal 

 tarsus of hind legs with no clawlike spines at apex. 



Triozinse Puton. 

 PAUROPSYLLINvC 



Body robust ; thorax strongly arched, broad ; head short, much 

 deflexed, rounded forward and downward, with eyes prominent ; 

 genal cones usually wanting or small and not prominent; frons 

 usually visible, bearing the anterior ocellus at upper end; 

 antennae usually short, often with long setae at apex. Legs 

 slender and usually not large. Forewings large, usually broadly 

 rounded at the apex, venation various. Many of the species 

 of this subfamily are gall makers. 



Key to the genera. 



a 1 . Genae not produced into distinct conical processes, but sometimes more 

 or less swollen beneath (somewhat conical in Paurocephala magni- 

 frons Crawford. 



