54 BULLETIN 85, UNITED STATES NATIONAL MUSEUM. 



in Psyllinge (see illustrations of wings of Carsidara, especially the 

 medial vein) . 



The members of this subfamily seem to be mostly tropical in their 

 distribution. Four, out of a dozen or more genera, are represented 

 in the American tropics and subtropics. The most characteristic 

 feature of the group is the deeply cleft head and the peculiar type of 

 wing venation, which is rather difficult to define. In this, as in the 

 preceding subfamily, one genus distinctly triozine in many respects 

 has been included. The relationships of this triozine genus, Rhinop- 

 sylla, to Carsidarinse seem to be closer than to Triozinse. 



SYNOPSIS OF GENERA. 



a*. Frons not covered by gense; antennae greatly tliickened in basal half. 



¥. Antennae much longer than body; gense produced into two small, inferior cones; 

 frons rather large; clypeus large; hind tibise without basal spur. 



Freysuila Aleman. 

 &-. Antennae much shorter than body; genae not produced as above; frons very 



narrow; clypeus small; hind tibiae with a spur at base Epicarsa Crawford. 



a^. Frons covered by gense, but sometimes not entirely so; antennae not thickened 

 in basal half. 

 bK Cubital petiole (M+Cu) present; head very deeply cleft in front; anterior 



ocellus above; pterostigma present in forewing Carsidara Walker. 



¥. Cubital petiole and pterostigma wanting (as in Trioza); head less deeply cleft; 

 anterior ocellus in front Rhinopsylla Riley. 



Genus FREYSUILA Aleman. 



Freysuila Aleman, '87: 21-26. 

 Freysuila ScnwARZ, '97:196. 



Head very deeply cleft in front and deeply concave between pos- 

 terior ocelli, strongly birostrate, with the thick antennae attached 

 to truncate apex of rostrate lobes and mcreasiug the rostrate appear- 

 ance; frons not covered by gense, visible as an oblong sclerite between 

 gense; gense swollen beneath antennas, with a small inferior epiphysis; 

 clypeus large. Antennae very long; third joint unusually long and 

 thick. Thorax large, broad, coarsely punctate. Hind tibiae with- 

 out spm- at base. Wings large, hyaline, rounded at apex ; pterostigma 

 present. 



Type of genus. — Freysuila dugesii Aleman. 



SYNOPSIS OF SPECIES. 



a'. Third antennal joint not over twice as long as fourth, usually flavous; color of 

 body imiformly flavous. 

 ¥. Third antennal joint about twice as long as fourth; genal epiphyses acutely 



pointed; M+Cu shorter than R; veins yellow dugesii Aleman. 



¥. Third antennal joint only a little longer than fourth; genal epiphyses smaller, 



not acutely pointed; M+Cu as long as R; veins black ernstii Schwarz. 



a^. Third antennal joint nearly four times as long as fourth, black; vertex and thoracic 

 dorsum with conspicuous black spots and bands (or brown); M+Cu shorter 

 than R cedrelse Schwarz. 



