48 GEO. H. HORN, M. D. 



SO variable, even with the suppressions I have made, as almost to 



resist generalization. 



In order that the changes in synonymy may be more clearly 



defined the following bibliography is added. 



0. oculaticollis Say, Journ. Acad. 1824, p. 406. 

 0. bimaculata Oliv. Ent. iv, 68, p. 21, pi. 4, fig. 4.3. 



tripunctata \\ Fab. Ent. Syst. i, 2, p. 310; Hald. Trans. Am. Philos. Soc. x, 

 p. 57; Lee. Journ. Acad. 1852, p. 152. 



affinis Harris, Ins. Mass. p. 91. 



perspicillata Hald. loc. cit. 



basalts Lee. loc. cit. p. 153. 

 0. quadricallosa Lee. Trans. Am. Ent. Soc. 1874, p. 68. 

 0. Schaumii Leo. Journ. Acad. 1852, p. 153. 

 0. tibialis Hald. loc. cit. p. 57. 



femoralis Lee. (err. typ.) loc. cit. p. 153. 

 0. flavipes Hald. loc. cit. p. 57; Lee. loc. cit. p. 152. 

 0. ocellata Hald. loc. cit. p. 56; Lee. loc. cit. p. 152. 

 0. texana n. sp. 

 0. tripunctata Swederus, Vet. Ac. nya Handl. 1787, p. 197. 



mandarina Fab. Syst. El. ii, p. 321 ; Lee. loc. cit. p. 152. 



amahilis Hald. loc. cit. p. 157. 



Tnyops Hald. loc. cit. p. 57; Lee. loc. cit. p. 152. 

 0. gracilis Fab. Syst. El. ii, p. 324; Hald. loc. cit. p. 57; Lee. loc. cit. p. 152. 

 0. ruficoUis Fab. Ent. Syst. i, 2, p. 311; Hald. loc. cit. p. 56; Lee. loc. cit. 

 p. 152. 



plumbea Oliv. Ent. iv, 68, p. 21, pi. 4, fig. 42. 



TETRAOPES Dalm. 

 Collections from all parts of our territory show conclusively that 

 the number of our species must be reduced. 



They may be distinguished in the following manner: 



Elytra with median and apical cordiforin black space. 



Disc of thorax black. Thoracic umbone suddenly elevated. 



discoidetis Lee. 



Disc of thorax red. Umbone gradually convex caiiteriator Drap. 



Elytra w^h black spots. 



Antennae black, not annulate. 



Abdomen very sparsely, scarcely visibly punctulate. Mandible of % with 



deep sinuation at base tetraoplithaluius Forst. 



Antennae more or less distinctly annulate. Abdomen densely but very finely 

 punctulate. Mandible of males with moderate sinuation. 

 Claws rather deeply bifid. Surface rather sparsely clothed with recumbent 

 pubescence, and with semi-erect hairs visible on the disc. 

 Thoracic umbone suddenly elevated, distinctly limited at sides. 

 Surface of umbone opaque. Abdomen scarcely punctulate. 



collaris n. sp. 

 Surface of umbone shining. Abdomen densely punctulate. 



I^moratus Lee. 



