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 Psyllidse. 
a 1 . Frons usually visible as a small sclerite, bearing front ocellus; genes 
seldom produced into processes; body short and robust; thorax 
strongly arched, head strongly deflexed; coxal spurs short. 
Pauropsyllinas Crawford. 
a.\ Frons covered by gense and not visible, except a very narrow border 
around front ocellus; body usually more elongate; coxal spurs usually 
not very short. 
b\ 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. 
b\ 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. 
<?. Forewings with cubital petiole (media and cubitus with a common 
stem) ; basal tarsus of hind legs with two clawlike spines at apex. 
Psyllinse Puton. 
c\ 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. 
Triozin3e Puton. 
PAUROPSYLLIN^E 
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 ; 
antenna 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 \ Gense not produced into distinct conical processes, but sometimes more 
or less swollen beneath (somewhat conical in Paurocephala magni- 
frons Crawford. 
