by FREDERICK A. A. SKUSE. 
im 
posterior cell very small, wide open, its base situated far beyond 
the base of the second sub-marginal cell. Fifth longitudinal vein 
rudimentary, scarcely perceptible. Legs slender. 
Genus 46. Exechia, Winn. 
Tips of the costal and second longitudinal veins uniting at a 
greater or less distance from the apex of the wing. Auxiliary vein 
short, bent posteriorly, ending in the first longitudinal vein, or 
broken off, forming only a tooth. Base of the inner marginal cell 
lying over or beyond the base of the second sub-marginal cell; the 
base of the second po.sterior cell moi’e or less beyond the base of 
the second sub-marginal cell. Petiole of the third longitudinal 
fork short. Fifth longitudinal vein broken off under or before the 
base of the second posterior cell, or disappearing. Sixth longi- 
tudinal vein lai’ge. Legs veiy slender. 
Genus 47. Zygojiyia, Winn. 
Tips of the costal and second longitudinal veins uniting far before 
the apex of the wing. Auxiliary vein incomplete, bent anteriorly, 
gradually disappearing or only forming a tooth. Apex of the 
inner marginal cell not situated beyond the base of the second 
.sub-marginal cell. Petiole of the fork of the third longitudinal 
vein short. Anterior branch of the fourth longitudinal vein 
wanting. Fifth longitudinal vein incomplete. Sixth longitudinal 
vein in most cases large. 
Genus 48. Sceptonia, Winu. 
Costal vein extending beyond the tip of the second longitudinal 
vein. Costal, first longitudinal, and second longitudinal voin.s 
approaching one another, running almost parallel. Petiole of 
the fork of the third longitudinal short. Apex of the inner 
marginal cell lying over the petiole of the third longitudinal fork. 
Anterior branch of the fourth longitudinal vein, and the fifth lon- 
gitudinal vein missing. Sixth longitudinal vein very large. 
