54 INSECUTOR INSCITI^ MENSTRUUS 



This list, confessedly lacking in many forms which occur 

 commonly in the immediate vicinity and whose ecological re- 

 quirements are fully met at some place on the island, is of 

 especial interest when compared with Dr. Hinds' total of 37 

 species for all North America,^ with Moulton's 24 for the 

 State of California,^ and with Shull's 21 for Huron County, 

 Michigan.^ It is interesting to note, too, the figures given by 

 some of the more extensive lists : Uzel* has 100 species from 

 Bohemia; Reuter^ has 67 from Finland; Bagnall,® 74 from 

 the British Isles; Buffa,'^ 31 from Italy; and Moulton,^ 118 

 from North America. 



Using the totals given in this list in comparison with the 

 number of Coleoptera known from the island, from North 

 America and from the world, some interesting results are 

 secured. The Coleoptera were selected for the reason that 

 they are one of the best worked and. most representative or- 

 ders of insects, and because those of the island have been 

 studied intensively. If they be used as the basis for calcu- 

 lation, and the number of species known from the island (now 

 about 1,290), divided by the number of species of thrips (57), 

 and the total number of species of beetles described from 

 North America (19,000), divided by the quotient (22.6), we 



'Hinds, Warren Klmer: "Contribution to a Monograph of the Insects of the 

 Order Thysanoptera inhabiting North America," Proc. U. S. Nat. Mus., Vol. 

 XXVI, 1902, pp. 79-242, pis. I-XI. 



''Moulton, Dudley: "A Contribution to our Knowledge of the Thysanoptera of 

 California," Bur. Ent., U. S. Dept. Agr., Tech. Ser. 12, Pt. Ill, 1907, pp. 

 i-vi, 39-68, pis. I-VI. 



'Shull, A. Franklin: "Thysanoptera and Orthoptera," in Ruthven: "A Bio- 

 logical Survey of the Sand Dune Region on the South Shore of Saginaw Bay, 

 Michigan," Publ. 4, Biol. Ser. 2, Mich. Geol. and Biol. Surv. 1911, pp. 177-231. 



*Uzel, Heinrich: "Monographic der Ordnung Thysanoptera," 1895, pp. 1-472, 

 pis. I-X. 



'Reuter, O. M.: "Thysanoptera Fennica: Forteckning och Beskrifning ofver 

 Finska Thysanoptera," Acta Soc. pro Fauna at Flora Fennica, Vol. XVII, 

 No. 2, 1899, pp. 1-69, figs. 



'Bagnall, Richard S. : "Notes on Some New and Rare Thysanoptera (Tere- 

 brantia), with a preliminary L,ist of the known British Species," Journ. Econ. 

 Biol., Vol. VI, 1911, p. 1-11. 



'Buffa, Pietro: "Trentuna Specie di Tisanotteri Italiani," Atti. Soc. Toscana 

 Sci. Nat., Mem., Vol XXIII, 1907, pp. 1-78, Tav. I, II. 



*Moulton, Dudley: "Synopsis, Catalogue, and Bibliography of North Ameri- 

 can Thysanoptera, with Descriptions of New Species," Bur. Ent., U. S. Dept. 

 Agr., Tech. Ser. 21, 1911, pp. 1-54, pis. I-VI. 



