xv « 2 Crawford: Jumping Plant Lice 141 



b 1 . Hind legs not larger than middle pair, apparently not saltatory, 

 hind coxae small, and coxal spur nearly wanting.... Apsylla Crawford. 

 b*. Hind legs longer than middle pair, apparently saltatory; metacoxae 

 much larger than mesocoxae, and metacoxal spur well developed. 

 c*. Forewings membranous, more or less transparent, 

 cf. Media, cubitus, and radius not forking at same point from basal 

 vein; hind wings not nearly wanting. 

 e\ Antennae short, seldom longer than head and thorax combined; 

 head usually much deflexed and retracted into large pro- 

 thorax. 

 f-. First marginal cell of forewing narrow and long, parallel- 

 ing posterior margin; media-cubital stem as long or nearly 

 as long as radial stem; metacoxal spur usually long, four 

 to eight times as long as thick; antennae usually longer 

 than width of head; genae sometimes swollen conspicuously 



beneath antennal bases Paurocephala Crawford. 



P. First marginal cell not narrow and long; media-cubital stem 

 usually shorter than radial stem or wanting. Metacoxal 

 spur usually very short, one to three times as long as 

 thick; antennae typically very short, seldom longer than 

 width of head; gense seldom swollen. 



Pauropsylla Riibsaamen. 



e\ Antennae longer than head and thorax combined; head less 



deflexed and retracted into prothorax. 



f 1 . Antennae not longer than body to tip of abdomen; meta- 



scutum with two prominent hornlike epiphyses projecting 



upward Diceraopsylla Crawford. 



f. Antennae very long and slender, longer than body to tip 

 of abdomen; metascutum without horns; gense swollen, 

 often spherical beneath antennal bases. 



Heteropsylla Crawford. 



<F. Media, cubitus, and radius of forewing forking from basal vein 



at same point (as in Triozinse) ; cubital vein unf orked at apex ; 



hind wings nearly wanting Leptynoptera g. nov. 



c*. Forewings nearly or quite opaque, more or less coriaceous; veins 



greatly contorted; front tibiae foliaceous Heteroneura g. nov. 



a 1 . Genae swollen beneath into two more or less conical processes, these 

 usually quite separated at base. 

 b\ First marginal cell of forewing long and narrow with Cui more or 



less parallel with margin of wing Paurocephala Crawford. 



b\ First marginal cell of forewing not long and narrow, Cu, not parallel 

 with margin. 

 c\ Body large; radial sector and media connected by a cross vein; 

 first marginal cell small, much smaller than second. 



Phacopteron Buckton. 



c 3 . Body small; cross vein wanting; first marginal cell very large, 

 much larger than second; genal cones in some species scarcely 

 discernible - Calophya Loew. 



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