SUBFAMILY VII. — RHYPAROCHROMINjE. 429 



Tribe V. LETH^INI Stal, 1872b, 59. 



The members of this tribe have the head, small, triangular; 

 ocelli widely separated the distance between them three times 

 or more than that between them and eye ; antennae with basal 

 segment usually exceeding apex of head by half or more its 

 length, second usually longest, third and fourth subequal ; beak 

 reaching hind coxae; pronotum quadrate or subtrapezoidal, its 

 disk usually with an ill defined constriction separating it into 

 two lobes ; scutellum triangular, not or feebly carinate. Seven 

 of the nine genera recognized by Barber (1918, 84) are repre- 

 sented in the eastern states. 



KEY TO EASTERN GEXERA OF LETH.-EINI. 



a. Pronotum with both lobes distinctly and closely punctate; front 

 tibiae of males either strongly cuiwed or bent and expanded 

 apically and armed with one or two preapical teeth. 



b. Antennae distinctly pilose; mesosternum not longitudinally sul- 



cate; basal segment of hind tarsus much longer than the others 

 united; body not strongly flattened. I. Drymus, p. 430. 



66. Antenna? not pilose; mesosternum strongly sulcate; basal segment 

 of hind tarsus subequal to others united; body much flattened. 



II. Gastrodes, p. 431. 

 aa. Pronotum with front lobe impunctate or with a few scattered punc- 

 tures ; front tibiae of males rarely strongly curved or abruptly ex- 

 panded at apex; antennae nearly nude. 



c. Dorsal surface dull or subopaque; expansion of side margins of 



pronotum wider and usually paler between the two lobes ; hind 

 tibiae without long rigid bristles; front lobe of pronotum, head 

 and scutellum black. 



d. Larger, length 5.5 or more mm. ; apex of tylus not reaching middle 



of first antennal ; side margins of pronotum more or less pilose ; 

 hind tibiae with short bristles or long hairs. 



III. Eremocoris, p. 431. 



dd. Smaller, length not over 4 mm. ; apex of tylus reaching to or 



beyond middle of first antennal; side margins of pronotum and 



hind tibiae nude. IV. Scolopostethus, p. 433. 



cc. Dorsal surface shining; expansion of side margins of pronotum 



not widened, and usually not paler between the two lobes; hind 



tibiae beset with rigid bristles ; front lobe of pronotum, head and 



scutellum usually reddish or chestnut-brown; length less than 



4.5 mm. 



e. Side margins of pronotum acute, converging in front, not pale 



or bordered within by an impressed line ; width of head across 

 eyes but slightly narrower than across front angles of prono- 

 tum. 



