496 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
Elaterinae. 
Lacon exhumatus. Limonius aboriginalis. 
Cardiophorus lithographus. Limonius florissantensis. 
Cardiophorus florissantensis. Limonius praecursor. 
Cardiophorus cockerelli. Limonius shoshonis. 
Cardiophorus requiescens. Limonius volans. 
Cardiophorus (?) deprivatus. Athous lethalis. 
Horistonotus coloradensis. Athous contusus. 
Cryptohypnus exterminatus. Athous fractus. 
Cryptohypnus hesperus. Paranomus exanimatus. 
Anchastus eruptus. Paranomus heeri. 
Anchastus diluvialis. Paranomus laevissimus. 
Monocrepidius dubiosus. Ludiophanes haydeni. 
Elater rohweri. Corymbites granulicollis. 
Elater scudderi. Corymbites primitivus. 
Elater florissantensis. Corymbites submersus. 
Megapenthes primaevus. Corymbites restructus. 
Cryptagriotes minusculus. Corymbites propheticus. 
Agriotes comminutus. Oxygonus primus. 
Agriotes nearcticus. Melanactes cockerelli. 
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 
category, 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. 
