94 FAMILY V. — PENTATOMID^E. 



in size ; pronotum with side margins either entire, or armed 

 with numerous blunt teeth ; scutellum subdepressed, usually 

 subtriangular, narrowed behind, and shorter than the corium ; 

 tarsi 3-jointed. 



Six tribes of the subfamily are recognized as being repre- 

 sented in North America. Of these members of four occur in 

 the eastern states. 



KEY TO EASTERN TRIBES OF PEXTATOMIX^. 



a. Body regularly oval, very flat, broadest behind the middle, all the 

 margins explanate (fig. 19) ; head about as wide as base of scu- 

 tellum, flat above; scutellum broad, but slightly narrowed apically. 



Tribe I. Sciocorini, p. 94. 



aa. Body usually broadest at humeral angles of pronotum, its margins 



not uniformly flattened ; head narrower than base of scutellum or, 



if nearly as wide, not flat above; scutellum narrowed behind. 



b. Cheeks usually with a distinct tooth on sides near their tips (fig. 



18, c) ; abdomen with a shallow lengthwise median groove; head 



very long, its sides not, or but slightly, sinuate in front of eyes; 



side margins of pronotum usually with numerous coarse teeth. 



Tribe II. Halyini, p. 95. 



bb. Cheeks without a lateral tooth near their tips (fig. 18, d) ; abdomen 



usually without trace of median groove; head shorter, its sides 



more or less sinuate in front of eyes; side margins of pronotum 



usually unarmed. 



c. Metasternum without a median smooth area as described in cc. 



Tribe III. Pextatomini, p. 103. 

 cc. Metasternum with a broad median smooth area, its front end pro- 

 longed forward, between the middle coxae and forked, its hind 

 one strongly notched to receive the ventral spine. (Fig. 35, a). 



Tribe IV. Edessini, p. 176. 



Tribe I. SCIOCORINI Amyot & Serville, 1843, 118. 



This tribe, as characterized in the key, is represented along 

 the northern border of the United States by a single introduced 

 European genus and species. 



I. SCIOCORIS Fallen, 1829, 20. 



Small, broadly oval, strongly flattened species having the 

 head as wide as base of scutellum, its apex broadly rounded : 

 cheeks strongly flattened and meeting in front of tylus ; ocelli 

 very small; pronotum with side margins broadly rounded, en- 

 tire ; scutellum reaching middle of abdomen, its apex rounded ; 

 connexivum very wide, almost wholly exposed. 



