Vol 1.] Van Duzee. — Sunoptical Keijs to Genera of Miridae. 209 



1. Second antennal joiiit clavate; third and fourth short and thick, fusi- 



form; prosternal xyphus convex, but slenderly margined 



2. Diplozona Van D. 



— Antennae linear, of nearly equal thickness throughout; second joint 



scarcely enlarged at apex, third and fourth linear....!. Cimatlan Dist. 



2. Elytra punctate, not buUate behind; basal joint of hind tarsi not pro- 



duced below beyond the second 3 



— Elytra impunctate, bullate behind, cuneus almost vertical; basal joint 



of hind tarsi thickened, oblique at apex and attaining the apex of 

 second joint; head nearly vertical, but little produced before the 

 eyes 4. Klopicoris Van D. 



3. Head strongly produced and nearly horizontal, surpassing apex of 



short first antennal joint; second antennal joint thick and very long, 

 nearly linear, longer than the remaining three joints taken together; 

 sides of pronotum ecarinate 3. Eurychilopterella Eeut. 



— Head less produced, not surpassing middle of basal antennal joint 4 



4. Sides of pronotum carinate, antennae rather short and slender, apex of 



the second joint distinctly thickened; membrane often uniareolate; 

 xyphus sometimes convex on the middle 5. Caraptobrochis Fieb. 



— Sides of the jironotum ecarinate; antennae longer, basal two joints 



stout, the first surpassing the apex of the head by two-thirds its 

 length, second a little thicker apically 6. Deraeocoris Kirschb. 



Tribe Bryocorini Douglas and Scott 



Form oblong, more or less elongated, elytra parallel or subparallel 1 



Form shorter, ovate or subovate 4 



1. Eyes on a suberect stylus which is at least as long as the width of the 



eye 9. Hesperolabops Kirk. 



— Eyes sessil, or at most but substylate 2 



2. Eyes large, exserted or substylate; callosities convex, oblique, con- 



tiguous at middle of pronotum, leaving a transverse triangular 

 punctured area before 8. Caulatops Bergr. 



— Eyes smaller, not at all stylate; callosities more transverse, not con- 



tiguous at middle of pronotum 3 



3. Body opaque, pubescent; second joint of antennae long, about equal- 



ling basal width of pronotum 7. Dacota Uhl. 



— Body smooth, more or less polished; second joint of antennae short, 



not longer than width of head 6. Sysinas Dist. 



4. Pronotum with a prominent linear collar 5. Monolocoris Dahlb. 



— Pronotum without a distinct collar 5 



5. Scutellum without a triangular discal impression 6 



— Scutellum with a triangular discal impression 7 



6. Embolium broadly expanded, about as wide as hind femora; pronotum 



strongly convex and bullate behind, with three longitudinal impres- 

 sions •. 4. Pycnoderes Guer. 



— Embolium linear; pronotum convex but not at all bullate or longi- 



tudinally impressed behind 3. Sixeonotus Rent. 



