NATURAL SCIENCES OF PHILADELPHIA. 61 



5. 0. interjectionis, sp. n. 



Ovate, ochreous-white, hody and legs fuscous, posterior femora 

 red ; head black with a frontal spot white ; thorax white, trans- 

 verse, hind angles obtuse; scutellum black; elytra brownish- 

 black, the margin and a dorsal vitta ochreous-white (this vitta 

 broad at the apex and sometimes interrupted), surface impunc- 

 tate, or scarcely visibly punctulate. L. .25. Texas (Lecoute). 



6. 0. vians, 111. Mag., vi. p. 33. 



Ovate, black, above olive green, alutaceous ; head deepl}^ punc- 

 tate, thorax transverse, sides nearly straight, hind angles acute, 

 base deeply sinuate behindthe angles, ochraceous, sparsely punc- 

 tate, alutaceous, disk with a broad transverse black spot leaving 

 a narrow ochreous margin ; scutellum smooth, black ; elytra aluta- 

 ceous, sparsely punctate ; beneath black ; posterior tibiae simple. 

 L. .23. Middle, Southern, and "Western States. 



V. scripticollis , Say, J. Acad., iv. 84. 



Somewhat larger, the thoracic spot is less developed, and forms 

 a sinuous band across the thorax. Hudson's Bay, Slave Lake. 



V. discicollis, Dej. 



Yery opaque, the elytral punctuation obsolete, thoracic punctu- 

 ation very deep and coarse. Southern States. 



V. concinna, Fabr., Syst El., i. 499, 109. 



Differs from the tj^pe by having the thorax entirely greenish- 

 black. These four very different looking forms appear to me at 

 most races of one species, all agreeing in having the apex of the 

 abdomen testaceous. 



7. 0. violaceus, Lee. Pr. Acad., 1859, p. 137. 



Ovate, violet-blue, rather shining; antennfe short, black, head 

 deeply punctate ; thorax transverse, sparselj'- punctate, angles 

 acute ; elytra rather closely and distinctly punctate, body be- 

 neath black, posterior femora sparingly punctate. L. .25. Fort 

 Tejon (Leconte). 



8. 0. lugens, Lee. Col., Kans., p. 24. 



Yery similar to the above, from which it differs, being entirely 

 alutaceous; thorax sparingly, el3'tra not visibly punctate; hind 

 angles of thorax much less prominent. L. .24. New Mexico 

 (Leconte). 



