1917] Barber—Synoptic Keys to the Lygaide (Hemiptera) 133 
in contact with front margin of pronotum. Width of head 
across eyes not much more than half the width of posterior 
margin of pronotum. Sides of clavus parallel. Costal 
margin of corium convexly arcuated. .[schnorrhynchus Fieb. 
BB. Head deflexed in front, almost vertical. Eyes distant 
from the anterior margin of pronotum; tumid back of eyes. 
Width of head across eyes subequal to width of posterior 
margin of pronotum. Clavus posteriorly widened. Costal 
margin of corium concave towards base....../ Ninus Stal. 
AA. Head with a curved longitudinal sulcus before each ocellus. 
Apical angles of the antenniferous tubercles prominent, acute. 
Basal segment of the antennz not surpassing the apex of the 
tylus; fourth segment shorter than third. Scutellum broader 
than long. Clavus widened posteriorly. Commissure much 
longer than scutellum. Hemielytra not hyaline, strongly and 
Gensely punctate 9.8414. 4a. 55 2). sea. 5: Tribe Cymini Stal. 
C. Tylus considerably produced before the buccule. 
Rostrum shorter, scarcely reaching middle of meso- 
sternum; second segment extending a little behind 
anterior margin of prosternum. Mesosternum dis- 
tinetly eTtoovediiy, 0. : aan 2a oes See Arphnus Stal. 
CC. Tylus not at all or very slightly extended beyond 
the bucculze. Rostrum longer, extending to or behind 
the intermediate coxee; second segment usually reach- 
ing anterior coxe. Mesosternum not distinctly 
(SAR OVEN | See RUA Seinen aie eee OL PR Cymus Hahn. 
Key to the Genera of the Subfamily Blissine. 
A. Body elongate; abdomen over twice as long as head and thorax 
together. Apical margin of corium straight. Anterior coxal 
cavities closed behind, along the posterior margin of the pro- 
sternum. Antenne longer than head, thorax and scutellum 
together. Rostrum relatively shorter, its apex not reaching 
past the middle coxee. Scutellum subequilateral 
Ischnodemus Fieb. 
AA. Body shorter; abdomen less than twice as long as head and 
thorax together. Apical margin of corium not straight but 
sinuate before apex of clavus. Coxal cavities open along the 
posterior margin of the prosternum. Width of head across 
