IQg Philippine Journal of Science ma 



while two others (Epipsylla and Metapsylla appear to be limited 

 to these Tropics. These five genera are included in the following 

 key, a more nearly complete synopsis of the subfamily being 

 available in my monograph. 



Subfamily characteristics are not numerous. The gense are 

 always more or less produced into either conical or flattish, spat- 

 ulate processes, vertex not cleft in front, usually more or less 

 fiat ; antennae always slender, either short or long. Basal tarsus 

 of hind legs always with two clawlike spines at apex ; hind tibise 

 with or without basal spur. Forewings oval or rhomboidal, 

 very seldom acutely pointed at apex, always with cubital petiole 

 (media and cubitus with common stem) . 



The most closely related subfamily appears to be Pauropsyl- 

 linse, and this differs in several characteristics, chiefly the almost 

 humpbacked thorax, the usually absent genal processes, usually 

 visible frons, short metacoxal spurs, and several others of less 

 constancy. 



Although not strictly a part of the palseotropical fauna, Frog- 

 gatt's Australian genera of this subfamily are included in the 

 following key: 



Key to the genera. 



»'. Genal processes conical, acutely or bluntly pointed; pterostigma of 



forewing closed (occasionally wanting) ; antennae at least longer 



than width of head. 



b*. Genal cones as long as or longer than vertex, slender and acute, 



directed forward ; antenna? very long, usually longer than body, 



forewing with or without pterostigma Epipsylla Kuwayama. 



b'. Genal cones shorter than vertex, usually directed more or less down- 

 ward. 

 c 1 . Pleural suture of prothorax extending to middle of lateral extrem- 

 ity of pronotum; genal cones broad and bluntly rounded, usually 

 extending more or less parallel with plane of vertex; forewings 



often maculated Arytaina Foerster. 



c 1 . Pleural suture of prothorax extending obliquely to posterior corner 

 of lateral extremity of pronotum; genal cones usually declivous, 

 more or less acutely pointed; forewings usually clear. 



Psylla Geoffroy. 



»*. "Genal processes flat, broad, not conical in outline; antenna? seldom long, 



usually very short. 



b l . Genal processes large, broad, more or less quadrate, scarcely divergent; 



antenna? seldom very short, though usually moderately so. 



&. Genal processes in same plane with vertex; flat; eyes more or 



less recessive and flattened; forewing often rhomboidal, with 



closed pterostigma or none Euphalerus Schwarz. 



c*. Genal processes depressed somewhat from plane of vertex; scarcely 

 flat; eyes usually hemispherical; forewings not rhomboidal, with 



pterostigma Arytaina Frst. also Eucalyptolyma Froggatt. 



&'. Genal processes short and rather broad; antenna? very short. 



