1879] 127 



upwards of 120 genera appear to have been determined, whicli are 

 distributed as follows, viz.: — Coleopiera (50), Neuroptera (3), Orthoptera 

 (6), Hemiptera {20) , Diptera (25), Symenoptera {IV) , Lepidoptera (10). 

 Tbe Coleoptera have received especial attention from Prof. Heer 

 and M. Oustalet, who have described about 80 species, belonging to 

 the following Families, viz. : — Carahidce, IIi/dropTiiJidcs, StapltyJhiided, 

 Scydmcenidce, 2TycetopTiagidce,Scarah(Bidce, EucnemidcE,Anthicid(^, Curcu- 

 lionidce, Scolytidce, Ceramhycidee, and OhrysomeJidcB. The Neuropfera 

 are represented by Lihellulidce and PliryganeidcB ; and the Ortlwptera 

 bj GrylIid(E, Lociistidcs, and 'Forficulidce. The Hemiptera have been 

 referred to Penfatomidce, Coreidce, Lygceidce, Tingidae, Nepidce, Cicadidce, 

 Cixiid(T, CercopidcB, Reduviidcp, Gerridce, Notonectidce, Teftigo7iiidce,a.Tid. 

 ApJiidce. The Diptera include Tahanida;, Stratiomyiidce, Syrphidae, 

 EmpidcE, Asilidcs, Bihionidcd, Tipulida-, Mycetophilidcs, CecidomyiidcB, 

 Chironomidcp, JBomhyliidce, &c. The Hymenoptera are represented by 

 TenthredinidcB, Ichneumoiiidce, Formicidce, Vespidce, and ChalcididiS. 

 Of the ten Lepidopiera, seven species* have been described by Dr. 

 Boisduval, Professor Heer, and Mr. Scudder, viz. : — five butterflies — 

 Neorinopis\ sepulta, Lethites Reynesi, Collates Proserpina, Thaites 

 ruminiana, and Pamphilites ahdita ; and two moths — -Noctuites deper- 

 diius and PyraJites ohsciirns. To this list may be added a fossil larva 

 of a species of SatyridtB, discovered at Aix by M. Henri Daudet, and 

 named by him Satyrites incertus. Two of the butterflies, N. sepuUa and 

 L. Reynesi, belong to the NympJialidcE \ two others, C. Proserpina and T. 

 ruminiana, to the Papilio7iidce ; and one, P. aidifa, to the Hesperiidce. 

 One fact of especial interest in connection with these fossil but- 

 terflies, to which Mr. Scudder has called attention, is, that in every 

 case, except one, fossil remains of the plants, which in all probability 

 served their larvae for food, have been found in the same beds from 

 which the insects were obtained. 



In conclusion, I will call attention to some of the leading types 

 of animals and plants with which the Insecta of the Eocene Period 

 were correlated. 



Of the Mollusca, the Brachiopoda had become much less common 

 than at any former Period, and the majority of the species belonged to 

 existing genera. The Lamellibranchiata and Gasteropoda were repre- 

 sented by a great number of species belonging to many of the existing 

 genera ; but the most interesting forms of the C('_^:'7i«Zt)^jof/'rt, characteristic 

 of the Cretaceous Period, had disappeared. 



* Four genera of Lepidoptera, i. «., Satyrus, Zygmia, Stsia, and Bombyx, were enumerated by- 

 Marcel de Serres and the Rev. F. W. Hope in their lists. 



+ Thi.s is the insect referred by Marcel de Serres to the genus Satyrus. 



