164 FAMILY V. — PENTATOMID^E. 



longest ; pronotum with front portion moderately to strongly 

 declivent, its side margins straight, humeri obtusely rounded ; 

 scutellum broad, gradually narrowed from the base, its apex 

 rather broadly rounded ; membrane slightly surpassing abdo- 

 men, its veins simple; connexivum narrowly or not at all ex- 

 posed ; spine of second ventral short, obtuse. Osteolar canal 

 attenuate, forming a tapering ridge which reaches almost to 

 outer apical angle of its supporting plate. 



About 20 species are known, mostly from the tropical re- 

 gions. Eight of them occur in the United States, six east of 

 the Mississippi. These naturally group themselves in two 

 series or subgenera, as shown under a and aa of the following 

 key : 



KEY TO EASTERX SPECIES OF BAXASA. 



a. Front portion of pronotum strongly declivent, its color pale yellow 

 or pale green, distinctly contrasting with the darker green, pur- 

 plish- or reddish-brown hue of the posterior portion; hind angles 

 of the ends of ventral segments acute or ending in minute spines. 

 b. Second joint of antennae not more than half the length of third; 

 incisures at ends of ventral segments without a black spot, 

 c. Basal halves of pronotum and scutellum quite evenly and regu- 

 larly punctate; genital plate of male very broadly and shal- 

 lowly concave; cheeks densely rugosely punctate. 



111. DIMIDIATA. 



cc. Basal halves of pronotum and scutellum very unevenly and 

 sparsely punctate, that of the latter in great part smooth; 

 cheeks obliquely strigose, almost impunctate. 



112. LENTICULARIS. 



bb. Second joint of antennae three-fourths the length of third; in- 

 cisures at ends of ventral segments with a black spot. 



113. CALVA 

 ri(7. Front portion of pronotum much less declivent, its hue usually con- 

 colorous with that of the hind portion; hind angles of the ends of 

 ventral segments obtuse. 

 d. General color above dull greenish-yellow or fuscous; basal angles 

 of scutellum without a large calloused ivory-white spot. 

 e. Second joint of antenna? three-fourths the length of third; in- 

 cisures at ends of ventral segments with a black spot; punc- 

 tures of upper surface rather fine, closely and quite regularly 

 placed. 114. sordida. 



ee. Second joint of antennae scarcely more than one-half the length 

 of third; incisures of ventral segments without a black spot; 

 punctures of upper surface coarse, very unevenly and sparsely 

 placed. 115. packardi. 



dd. General color above clear green; basal angles of scutellum each 

 with a large calloused ivory-white spot. llfi. euchlora. 



