60 PROCEEDINGS OF THE xiCADEMY OF 



Eb. Elytra with one dorsal vitta. miniata. 



Bb. Intermediate tibire ungulate externally. 



E. Oval, suture broadly black. tliyamoides. 



Eb. Parallel, suture and a dorsal vitta black. texana. 

 Cb. Epipleurse equally broad. 



I). Tliorax coarsely punctate ; elytra with a plica. 



(}-7naculata. 

 Bb. Thorax smooth ; elytra simple. 



E. Short, oblong. guercata. 



Eb. Elongate, elytra more finely punctate. scalaris. 



A. Thorax with the sides narrowly rejftexed, antennae loith joints 



3-11 2^'^ibescent, fuscous. 



1. 0. opacior, sp. n. 



Elongate, oval, black, opaque, femora and thorax red ; head and 

 thorax smooth, this with the sides rounded, reflexed, hind angles 

 obtuse, base rounded not marginated ; el^'tra evidently and closely 

 punctate, posterior femora smooth, tibiae subexcavate at tip. L. 

 .40. Texas. 



2. 0. gibbitarsis, Say, J. Acad., iv. 83. 



Ovate, ferrugineous ; antennae, tibiae, and tarsi fuscous, elytra 

 brilliant green; head and thorax smooth; this generall3' with 

 four green discoidal spots placed transversely ; hind angles acute, 

 distinct ; elytra rather faintly and sparsely punctate ; body be- 

 neath ferrugineous. L. .28. Kansas, Pennsjdvania. 



3. 0. lustrans, sp. n. 



Allied to 0. gibbitarsis, but with impunctate elytra, and much 

 less strongly developed posterior claw-joint; the head, thorax, 

 femora, and body beneath are yellow; the metasternum and a 

 frontal spot being black ; the thorax is less transverse, and the 

 hind angles are rather obtuse. L. .28. Texas. 



o' 



4. 0. 8-maculata, sp. n. 



Subelongate, ochreous-white ; antennre fuscous, basal joints 

 parti}' i^ale ; head with a frontal spot white, thorax white above 

 and below, formed as in O. Iust7'ans : el3'tra black, impunctate, 

 each with four large white spots, and the humeral angle narrowl}-- 

 white ; the spots are one subscutellar, one submarginal before the 

 middle, one pear-shaped near the suture, just behind the middle, 

 one reniform transverse, subapical. L. .24. Texas. 



Body beneath pale, four anterior legs fuscous. 



