THE JUMPING PLANT-LICE OR PSYLLIDiE OF THE NEW WOELD. 19 

 Subfamily LIVUN^K. 



This subfamily is characterized chiefly by the flattened head, the 

 inferior position and the shape of the frons, the form of the gense, the 

 short antennae and more or less thickened wings. 



Head flat, not deflexed ; vertex longer or shorter than broad ; frons 

 beneath vertex, not covered by genae, visible as a narrow (usually 

 elongate) sclerite from clypeus to front ocellus; gense more or less 

 swollen beneath vertex, never conical. Antennas usually short, 

 rather thick. Eyes compressed (Liviini), or bulging more con- 

 spicuously (Aphalarini) . Thorax scarcely arched ; sutures not deeply 

 impressed. Wings more or less thickened, variable in shape and 

 venation. 



SYNOPSIS OF GENERA. 



a^. Eyes greatly flattened, not hemispherical; vertex longer than broad; pronotum 



extending far down laterad toward coxae; wings thickened Tribe Liviini. 



One genus Livia Latreille. 



a^. Eyes more or less hemispherical; vertex not longer than broad.. Tribe Aphalarini. 

 ¥. Pronotum extending down laterad to below lower surface of eyes; vertex about 



as long as broad ; gense not swollen ; wings thickened Rhinocola Forster. 



b^. Pronotum not extending down laterad as far as lower surface of eyes, shorter 

 with a knob-like lateral termination; vextex broader than long; gense some- 

 what swollen. 

 c^ Vertex flat, more than half as long as broad; genae only slightly swollen; wings 

 usually ovate, hyaline, often maculated; male anal valve with a long 



posterior horizontal lobe Aphalara Forster. 



c?. Vertex shorter, not as flat as in above genus; gense more swollen but not cover- 

 ing frons; wings more or less thickened and rhomboidal; male anal valve 

 not as above Aphalaroida newgenus. 



Tribe LIVnNI. 

 Genus LIVIA Latreille. 



Head not deflexed, as broad as prothorax and closely joined to it; 

 vertex flat, usually longer than broad, more or less rectangular in 

 outline, apical portion thin; frons not covered by genae, visible as 

 an elongate sclerite beneath vertex from clypeus to front ocellus; 

 genae somewhat swollen, never produced into cones; eyes greatly 

 flattened, scarcely bulging from head, with a small tubercle (pre- 

 ocular tubercle) in front of each; anterior ocellus beneath, not 

 visible from above. Antennae short, basal segments unusually 

 large. Thorax flat; pronotum extending far down laterad nearly to 

 coxae; propleurites very small. Legs short. Wings thick, often 

 maculate, or rhomboidal. 



Type of genus. — Livia juncorum Latreille. This species was desig- 

 nated as the type by Latreille in 1810 ('10: 265). 



SYNOPSIS OF SPECIES. 



a^. Wings maculated, relatively broad. 



b. Wings rather small, rhomboidal or rectangular; M strongly arched; Rs sinuate; 

 vertex short; segment II of antennae short coloradensis, new species. 



b^. Wings rather large, broadly ovate, not squarish; M almost straight; second mar- 

 ginal cell much larger than first. 



