258 The Philippine Journal of Science 1915 



6^ Antennae very thick and often long, densely clothed with long hairs. 

 Vertex without horns. Genal cones present, may be small or large. 



Homotoma. 

 a^ Head not deeply cleft, as above, and antennae not thickened so con- 

 spicuously. (Genal cones may give appearance of a cleft head, but 

 antennae are not attached to their apices.) 

 6'. Genal cones wanting. 



c\ Wings broad and more or less angular at the apex; vertex rather 

 smoothly and uniformly rounded down in front. Antennae short, 

 not much longer than width of head. Thorax usually very thick 



and robust Pauropsylla. 



c". Wings ovate, rounded at apex, smaller; vertex less smoothly rounded 

 down in front, sometimes flattish. Antennae relatively a little 

 longer. Thorax not strong'ly arched, often pubescent. 



Paurocephala. 

 6*. Genal cones present. 



c\ Head as in Pauropsylla, but with small or large genal cones far 

 underneath, projecting down or forward. First marginal cell 



much larger than second Calophya. 



c^ Head not as above; cones not far underneath. 



d\ Cubital petiole (stem of media and cubitus) present. First tar- 

 sal segment with 2 spines at apex. 

 e\ Genal cones very long, longer than vertex, pointing forward. 



Epipsylla. 



e^ Genal cones shorter, pointing downward obliquely or vertically. 



/^. Genal cones continuing in plane of vertex, broad and rounded. 



Euphalerus. 

 /-. Genal cones depressed below plane of vertex and not con- 

 tinuing in same line, usually tapering to a point Psylla. 



d^ Cubital petiole wanting, media and cubitus arising together from 

 basal vein. First tarsal segment without spines at apex. 

 e\ Dorsum scarcely arched; pronotum long and not depressed 



below level of mesonotum and vertex Megatrioza. 



e". Dorsum arched; pronotum short and distinctly depressed. 

 /\ Genal cones long, slender, not at all divergent, pointing for- 

 ward or down. Body slender Neotriozella. 



/^ Genal cones divergent, thicker, usually pointing down.. Trioza. 



Genus PAUROPSYLLA Rubsammen 



Body usually short and thick. Head short, without genal 

 cones. Antennae short. Wings usually broad, hyaline, or ma- 

 culated. Insect usually gall-forming. Species mostly tropical. 



Pauropsylla triozoptera Crawford.^ 



One female from Mount Maquiling, Luzon, P. I. (Baker) . 



Pauropsylla bakeri sp. nov. Plate I, fig. /. 



Length of body, 1.9 millimeters; length of forewings, 2.6; 

 width, 1.4 ; width of head, 0.7. General color chocolate brown to 



' This Journal, Sec. D (1913), 8, 296. 



