156 HEO. H. HORN, M. D. 



3. — Scutellum smooth 4. 



Scutellum punctured 8. 



4. — Front without punctures 5. 



Front bipunctate 7. 



5. — Margin of thorax distinctly explanate spelteus. 



Margin of thorax not explanate 6. 



6. — Head broadly oval. 



Second joint of antennae shorter than third, joints 4 — 10 evidently 



gradually broader fulgidiis. 



Second joint as long as the third, antennae slender. (Species much 



smaller thun fulgidus j^ublimbaius. 



Head elongate, as long as the thorax peregriutis. 



7. — Elytra very irregularly punctured capitciniis. 



8. — Elytra finely and very densely punctured <lesertus. 



Elytra more coarsely and not densely punctured liiubifei*. 



9. — Elytra impunctured, form depressed liCvigatus. 



10. — Labrum broadly arcuate ...molocliinus. 



Labrum truncate. Eyes usually large 11. 



11. — Scutellum punctured. No frontal punctures hyperboreiis. 



Scutellum smooth 12. 



12. — Infra-orbital ridge well marked. Frontal punctures teiiesceiiS. 



Infra-orbital ridge feeble or obsolete 13. 



13. — No frontal puncture 14. 



Frontal punctures distinct 15. 



14. — Eyes large but not prominent, abdominal segments not impressed, pubes- 

 cence unicolorous, elytra sparsely and very indistinctly ]3unctured. 



Surface not aeneous (leliilis. 



Eyes large and prominent, abdominal segments vaguely impressed on 

 each side containing greyish pubescence. 

 Elytra regularly punctured over the entire surface, thorax seneous, elytra 



black, shining prostans. 



Elytra with distant punctures in rows, thorax black, elytra seueous. 



seriatns. 

 15.— Eyes large and prominent, occiput and post-ocular region with numerous 



punctures. Surface seneous piiucticeps. 



B. — Tarsi above glabrous. Thorax bipunctate. 



Form slender, thorax with nearly parallel sides ferox. 



Form robust, thorax narrowed in front verilix. 



In using the above table it must be borne in mind that there is a 

 tendency iu many species to vary, and lose to a greater or less extent 

 some of the characters which distinguish the species in the aggregate. 

 This has been especially noticed in fulgidus, the two extremes of a 

 series seem almost like distinct species. The form of the labrum must 

 also be taken from a series and not from one specimen alone. 



In the preparation of the present paper, the material in the cabinets 

 of Dr. Leconte and Mr. Ulke have been freely at my disposition as 

 well as my own. 



