156 
Philippine Journal of Science 
1919 
ened and sometimes very hairy. Thorax not strongly arched. 
Hind tibiae usually with a spur at base and spines at apex; 
basal tarsus of hind legs usually with one black claw (two in 
Homotoma, but the relationships of this genus are not clear). 
Forewings always membranous and hyaline, usually more or 
less acutely pointed, often with a veinlike callus or two con- 
necting veins distad. There is a scarcely definable, characteristic 
manner of branching of medial and cut^tal veins. 
Although I have seen no representatives of certain Autralian 
genera, the illustrations and descriptions of these point to an 
affinity with Carsidarinse so clearly that they have been included 
here, tentatively. Homotoma is an old genus and still of very 
doubtful relationship. The presence of two claws on the basal 
tarsus of the hind legs is distinctly a characteristic — and appa- 
rently an important one — of Psyllinae and not of Carsidarinse. 
The gense, also, often are produced into distinct cones. It is 
possible that the genus should be referred to another subfamily, 
but for the present at least it may be retained here. 
Key to the genera. 
a 1 . Cubitus and media with common stalk (cubital petiole). 
b 1 . Antennae thick throughout, not longer than body to tip of abdomen. 
c 1 . Antennae thickly hirsute and often carinate; genae usually with 
conical processes directed downward on each side of clypeus. 
Homotoma Guerin. 
c 2 . Antennae not hirsute, nor carinate, but terete; genae not produced 
into cones Epicarsa Crawford. 
b'\ Antennae slender at least beyond third segment, usually distinctly 
longer than body (except in Macrohomotoma) , not hirsute. 
c\ Head birostrate in appearance, by the projection forward of genae 
on each side of midline and attachment of antennae at end of 
projecting genae. 
dt. Outer anterior angles of vertex elevated above genae, more or 
less hornlike; insect usually very large. 
e\ Female genitalia with ventral valve nearly as long as dorsal, 
latter without thick fringe of hairs; vertex produced into a 
large horn over each antennal socket; hind tibiae without 
basal spur, with very large spines at apex; first antennal 
segment very long; forewing with marginal cells nearly 
equal in size Dynopsylla Crawford. 
e\ Female genitalia with ventral valve very short, dorsal valve 
many times larger and very thickly fringed with stiff hairs 
along ventral margin, vertex sharply angled but not produced 
into horns in front; hind tibiae with basal spur; first marginal 
cell of forewing much smaller than second. 
Thysanogyna g. nov. 
d 1 . Vertex not as above. 
e 1 . Forewings with pterostigma, hind tibiae usually with basal 
spur; antennae very long and slender. 
