11^ ( April - 



ITeinrich Frpy's first Entoinological treatise was on the Swiss speeies of tlw 

 genus Lithocolletix, " Uuber die in der Schweiz beobachteten Arten des Genus Litho- 

 coUetis, ZclL," which appeared in 1855 in the Mittheilungen der naturf. Gesellschaft 

 in Ziirich, band iii, pp. 600 — 635. 



This was soon followed by an 8vo volume of 430 pages, " Die Tineen und Pte- 

 rophoren der Schweiz," published in 1856. Of this work we wrote at the time it 

 appeared (Trans. Ent. Soc. London, New Series, iv, p. 86), "During the last montli 

 an unpretending 8vo Tolume of 430 pages, without plates, has appeared, which at 

 once takes its stand as the Continental work on the Tineinia." " On account of the 

 immense amount of systematized details it gives of the habits of the families, genera 

 and species, of their geographical distribution throughout Europe, it will be read 

 with extreme interest in every corner of Germany, and indeed wherever the German 

 language is understood." " In short, this volume clearly establishes the reputation 

 of Professor Frey of Zurich as the first Micro-Lepidopterist in Europe." 



When one reflects that this was almost his first appearance as an Entomological 

 author (his previous publications I'elating mainly to MoUnsca, to study which gi-oup 

 he had, when at Gottingen, made, along with his friend Leuckart, an excursion to 

 Heligoland), one is struck with the completeness and finish of such a first work. 



In the same year (1856) he wrote a short paper " On the Generation of Insects 

 from Unfertilised Eggs, in reference to von Siebold's recent work on that subject ;" 

 this appeared in the " Monatsschrift des wissenchaftlichens Vereins in Ziirich," i, 

 pp. 473—483. 



In 1857 appeared, in the lltli volume of the Linnsea Entomologica, his "Re- 

 vision der Nepticulen," extending to 96 pages (351 — 446). Frey notes in this treatise 

 how rapidly our knowledge of these small, but beautiful insects had increased in the 

 previous ten years, so that he was then able to describe 56 species, whereby he gave 

 a great impetus to the study of these splendid atoms. (The Catalogue of Staudinger 

 and Wocke, in 1871, enumerates 111 speeies of the genus, and so many novelties 

 have been found since, owing to the greatly increased number of workers in the 

 group, that I dare say we have now well nigh 200 species of Nepticula in Europe). 



In the Entomologist's Annual for 1858 was a chapter by him on " The Tineae 

 of the Higher Alps," pp. 137 — 150, pointing out that in the upper Alpine Fields 

 small moths were not nearly so numerous as butterflies. 



The three volumes of the " Linna?a Entomologica," xiii, xiv and xv, published 

 in 1859, 1860 and 1863, each contain a Treatise by Professor Frey : that in vol. xiii 

 on the genus Elackixfa, pp. 172 — 314 ; that in vol. xiv on the genus Lavenia, pp. 

 180 — 205 ; and that in vol. xv on the genus Ornix, pp. 1 — 41. 



His next Entomological work appeared from 1865 to 1869, in the first three 

 volumes of the Mittheilungen der schweizerischen entomologischen Gesellschaft on 

 the Swiss Micro-Lepidoptera, " Die schweizerischen Microlepidopteren ;" of this there 

 were six separate parts — one near the end of the first volume, pp. 329 — 352 ; four 

 in the second volume, pp. 136—146, 169—186, 286— 3(3, and 376—380; and one 

 in the third volume, pp. 28 — 43. This work is interesting, specially from com- 

 mencing with the Plumes, then going to I\epiicula, and, so to speak, working 

 backwards, finishing with Exapate, 



These papers were followed in 1870 by " Ein Beitrag zur Kenntniss der Micro- 



