496 



bulletin: museum of comparative zoology. 



Elaterinae. 



Lacon exhumatus. 

 Cardiophorus lithographus. 

 Cardiophorus florissantensis. 

 Cardiophorus cockerelli. 

 Cardiophorus requiescens. 

 Cardiophorus (?) deprivatus. 

 Horistonotus coloradensis. 

 CryptohjV'pnus exterminatus. 

 Cryptohypnus hesperus. 

 Anchastus eruptus. 

 Anchastus diluviaHs. 

 Monocrepidius dubiosus. 

 Elater rohweri. 

 Elater scudderi. 

 Elater florissantensis. 

 Megapenthes primaevus. 

 Crj^ptagriotes minuseulus. 

 Agriotes comminutus. 

 Agriotes nearcticus. 



Limonius aboriginalis. 

 Limonius florissantensis. 

 Limonius praecursor. 

 Limonius shoshonis. 

 Limonius volans. 

 Athous lethalis. 

 Athous contusus. 

 Athous fractus. 

 Paranomus exanimatus. 

 Paranomus heeri. 

 Paranomus laevissimus. 

 Ludiophanes haydeni. 

 Corymbites granuUcoUis. 

 Corymbites primitivus. 

 Corymbites submersus. 

 Corymbites restructus. 

 Corymbites prophetieus. 

 Oxygonus primus. 

 Melanaetes cockereUi. 



Assuming the above species to be correctly referred to their re- 

 spective genera, analysis shows that five belong to the Eucneminae, 

 the remaining thirty-eight to the Elaterinae. Of those in the second 

 categor}^, one belongs to the Agrypnini, the other thirty-seven to the 

 Elaterini which holds today the great bulk of North American species 

 of the subfamily. According to the classification adopted by LeConte, 

 the Elaterini separates on the basis of the structure of the metacoxal 

 plates into two subtribes, the Elaterini (genuini) and the Corym- 

 bitini, dividing the North American species between them almost 

 exactly in the ratio of three to four. Of the fossils, fifteen are referred 

 to the first subtribe, twenty-two to the second, giving a ratio rather 

 startlingly similar. Of course the number of species involved is small 

 enough to allow a considerable percentage of error to creep in, should 

 the identifications turn out to be wrong in any case, but the conclu- 

 sions must be held to have some weight. On the face of the matter, 

 the figures would indicate that the relative percentages of Elaterini 

 and Corymbitini were almost the same at Florissant during the Mio- 

 cene as they are in North America in general today. 



