Platynin.e 



57 



rather less convex, much duller in lustre, although the anterior 

 parts are rather shining; color dark metallic blue or green; under 

 surface black; head only slightly narrower than the prothorax, 

 rather elongate, with large and prominent eyes; labrum and man- 

 dibles pale; anterior impressions rectilinearly oblique posteriorly; 

 antennae long and very slender, filiform, fully two-thirds as long as 

 the body, fusco-testaceous, still paler basally, the medial joints 

 about five times as long as wide; prothorax as long as wide, some- 

 times a little longer, the finely reflexed sides moderately oblique and 

 just visibly sinuate posteriad, the very obtuse angles with rather 

 well defined tips; apex sinuate, with rather sharp angles, as wide 

 as the base to wider; anterior impression sometimes completely 

 obsolete; stria strong, subentire; basal parts and especially the 

 foveae more or less punctate, the foveae deep, lineate at the bottom, 

 traceable to the middle, the surface between the basal part and 

 the sides flat but inclined strongly upward; elytra long, three-fifths 

 longer than wide, somewhat wider behind the middle than at base, 

 oblong, the sides feebly arcuate, rapidly rounded at the humeri; 

 sinus sometimes scarcely traceable; striae moderate, deep, grooved, 

 with fine and close-set but usually evident punctulation; intervals 

 flat or nearly so, the third with five or six punctures; met-episterna 

 twice as long as wide; anterior male tarsi not very feebly dilated. 

 Length (cf 9) 8.4-9.7 mm.; width 2.8-3.4 mm- Indiana, Iowa, 

 Kansas, and Texas (Galveston and Austin), [Feronia extensicollis 

 Say; An. viridis Lee.]. Apparently not occurring east of the 

 Appalachians, where it is replaced by eJongatulus Dej. 



extensicollis Say 



Body smaller, more convex and more ventricose than in estensicollis, 

 still duller in lustre, with opaculate elytra; anterior parts deep 

 indigo, the elytra very dark violaceous-blue; head slightly narrower 

 than the prothorax, with well developed and rather prominent eyes 

 and posteriorly oblique anterior impressions; antennae fuscous, 

 paler basally, not quite so long or slender as in the preceding, the 

 medial joints not quite four times as long as wide; prothorax nearly 

 similar in outline though not quite as long as wide, basal regions 

 finely punctulate, the foveae and stria as in extensicollis, the former a 

 little smaller; anterior impression barely traceable; elytra three- 

 fifths longer than wide, almost twice as wide as the prothorax, sub- 

 parallel, with feebly arcuate sides and rapidly rounding humeri, 

 the sinus very feeble; striae nearly as in the preceding but more 

 deeply impressed as a rule, the punctulation much less distinct, 

 scarcely traceable; intervals usually somewhat convex, rather 

 flat in the female, the third with five punctures; anterior male tarsi 

 distinctly dilated. Length (cT 9) 7.5-8.4 mm.; width 2.8-3.2 

 mm. Arizona. Said by Dunn to have been taken near Benson. 

 [PI. extensicollis var. 5, Lee] cyanescens Mots. 



8 — Sides of the prothorax parallel and very evenly, moderately arcuate 

 from apex to base, the angles extremely obtuse, marked onlj- by a 

 minute projection at the posterior setigerous pore, the projection 

 sometimes wanting, in that case rendering any definition of an 



