No. 34-] HEMIPTERA OF CONNECTICUT I MIRIDAE. 509 



Tribe ORTHOTYLINI. 



Key to Genera. 



Pronotal disk transversely sulcate behind the calli and extending 

 over the sides ; calH distinctly arched, separated by a depression 2 



Pronotal disk without transverse sulcus ; calli not so distinctly 

 arched 3 



Length of antenna! segment i never exceeding width of vertex plus 

 an eye ; female with antennal segment ii distinctly thickened 

 apically, usually brachypterous ; black species with paler mark- 

 ings (p. 510) Globiceps 



Length of antennal segment i nearly equaling width of head, thicker 

 on basal half and tapermg apically; antennal segment ii linear in 

 both sexes ; green species [Blepharidopterus] 



Pronotal disk immarginate although sometimes forming a rather 

 sharp angle ; antennal segment ii linear ; vertex scarcely margined 

 and never fitting closely against front margin of pronotum 4 



Pronotal disk margined at sides ; antennal segment ii incrassate, 

 fusiform, segment iii thickened but more slender than ii ; vertex 

 strongly margined, fitting closely against anterior margin of pro- 

 notum; clothed with closely appressed, scale-like pubescence, and 

 intermixed with erect fine hairs (p. 524) Heterocordylus 



Antennal segment i with black line on each side, and connected 

 beneath near apex ; eyes elongate as seen from above, their inner 

 margins parallel ; color white or greenish, clothed with rather 

 long white pubescence (p. 523) Reuteria 



Antennal segment i never marked with longitudinal black lines ; 

 eyes not so elongate when seen from above, their inner margins 

 diverging .•••:•• 5 



Head inclined, when viewed from the side not or scarcely projecting 

 below base of head ; sexes similar 6 



Head vertical, strongly compressed apically, when seen from the 

 side, projecting below base of head for a distance equal to one- 

 half its height at base ; pronotum sinuate at base and slightly so 

 at the sides ; male and female very dissimilar ; female short 

 winged, the abdomen very broad, macropterous forms rare .... 



(p. 510) Mecomma 



Head not distinctly compressed apically, vertex margined although 

 sometimes ecarinate ; width of pronotum distinctly greater than 

 width of head; vertex when black, never with a pale spot at 

 each side .••.••• 7 



Head strongly compressed apically, vertex immarginate, declivitous 

 behind; basal width of pronotum very little greater than width 



of head ; usually a small pale spot each side of vertex 



(p. 511) Cyrtorhinus 



Eyes set close to pronotal angles and nearly forming a straight line 

 with base of vertex 8 



Eyes rounded behind, thus bringing the center of eyes near middle 

 of head and away from pronotal angles. Small, delicate, trans- ^ 

 lucent pale green species (p. 522) Diaphnidia 



Xyphus moderately sulcate, sides V-shaped; rostrum extending 

 beyond hind margin of mesosternum; pubescence frequently of 

 two types, but in such case the rostrum extends beyond meso- 

 sternum ; vertex carinate but sometimes rather obtusely so, never 

 beset with bristly hairs (p. 511 ) Orthotylus 



Xyphus deeply excavated, sides U-shaped and elevated into a high 

 carina ; rostrum scarcely attaining hind margin of mesosternum ; 

 pubescence composed of two kinds of hairs, a closely appressed 



