NATURAL SCIENCES OF PHILADELnilA. 63 



dorsal vitta more remote from the suture. L. .24. Middle and 

 Southern States. 



14. 0. thyamoides, sp. n. 



Regularly oval, ferrugineous; antennje fuscous, base pale; head 

 with a few deep punctures near the e3^es; thorax scarcely punctu- 

 late, opaque, sides rounded, angles acute; scutellum smootli ; 

 elytra finely alutaceous, rather closel}' punctate, external margin 

 broad ochreous; a broad sutural vitta not reaching the apex, 

 black. L. .15-.16. Western States (Leconte). 



Differs from the preceding by the intermediate tibiie angulate 

 externally. 



15. 0. texana, sp. n. 



Elongate, subparallel, depressed, head and body beneath black; 

 antennae at tlie base, legs, and prosternum ferruginous ; head 

 evidently punctate ; thorax with the sides nearly straight, smooth, 

 subopaque, ochreous ; scutellum black ; elytra oclireous, punctate, 

 suture and a dorsal vitta not reaching the apex, black. L. .16. 

 Texas (Belfrage). 



Very like a species of Systena in form and coloration. 



16. 0. 6-maculata (111.), Mag. vi., p. 104. 



Oblong, opaque, obscurely ferruginous, above coarsely punc- 

 tate ; thorax and elytra irregularlj' variegated with brownish- 

 black, these with a distinct plica parallel to the margin. L. .12. 

 Middle States. 



This and the following species agree in having the elytral epi- 

 pleurffi equally broad and not sinuate about the middle as in the 

 others. 



17. 0. quercata (Fab.), Syst. El., i. 495, limhalis, Mels., Pr. Acad. iii. 



YerjMike 0. 6- macz^/a/a, but thorax obsoletelypunctulate; elytra 

 black, margin pale ochreous, and body beneath black. The elytra 

 also have no submarginal plica. L. .12. Southern and Middle 

 States. 



The punctuation of the elytra is variable in strength, and pale 

 variet ies occur in which there is only a basal dot and dorsal vitta 

 dark. 



18. 0. scalaris, Mels. Pr. Acad., iii. 163 ; lohata, Lee. Col. Kans., p. 24. 



More elongate than the preceding; thorax impunctate; elytra 

 much more sparingly and finely punctate ; irregularly variegated 

 with brown. L. .20. Kansas, Pennsylvania. 



