BIBLIOGRAPHY OF ECONOMIC ENTOMOLOGY. 15 



43. WALSH, B. D. On the pupa of the ephemerinous genus Bcetisca 



Walsh. <Proc. Ent. Soc. Phil., August, 1864, v. 3, pp. 200- 

 206, fig. 

 Description and figures of the pnpa of Bcvtisca obesa Say. 



44. WALSH, B. D. On certain entomological speculations of the Xew 



England school of naturalists. <Proc. Ent. Soc. Phil., Au- 

 gust-September, 1864, v. 3, pp. 207-249. 



Discussion of statements, chiefly by Prof. L. Agassiz, upon questions in gen- 

 eral entomology. The memoir is divided into sections ; in the first, the dis- 

 tribution of insects in North America is discussed in opposition to the 

 views of Agassiz ; in the second section the Darwinian theory of the origin 

 of species is discussed and some remarks on the variation of several species 

 are added; in the third and fourth sections the statements of Prof. Agas- 

 siz regarding the worm-like larva stage of insects and the resemblances 

 between the pupae of insects and the Crustacea are discussed and criticised ; 

 in the fifth section the author argues that the relative rank of the differ- 

 ent orders of insects must be determined from a consideration of all the- 

 characters of each order and not from the significance of any one character; 

 the sixth section is a review of Dana's classification of insects on the prin- 

 ciple of cephalization ; and in the seventh section several erroneous state- 

 ments and generalizations in the same author's paper on classification are 

 pointed out. 



45. WALSH, B. D. On phytophagic varieties and phytophagic species. 



< Proc. Ent. Soc. Phil., November, 1864, v. 3, pp. 403-430. 



Many species feed exclusively upon a single food-plant, while other species 

 feed upon many kinds; correlated with this are certain larval or imag- 

 inal differences ; when these different forms interbreed they are considered 

 the same species and are termed phytophagic varieties ; these when sepa- 

 rated with a single kind of food-plant form phytophagic races, and these 

 again by a continuation of their isolation form phytophagic species. Phy- 

 tophagous forms are most abundant where the imago is wingless. Dia- 

 pheromera relii, Tiuyis [=Gargaphia] tilice, and T. [=(?.] amorphas are 

 described as new ; the following are mentioned in the remarks upon species 

 and varieties: Haltica [=DisonycAa] alternata, Chrysomela scalaris, Clytus 

 [= Cyllene] robinice, C. [= C. J pictus, Dryocampa [= Sphingicampa] bicolor, 

 Sphingicampa distigma [= bicolor], Bombyx [= Sericaria'] mori, Halisidota 

 tessellaris, H caryce, H. antiphola [= tesseUaris~\, Cynips [= Amphibolips] q. 

 spongifica, C. [ = Andrious'] q.punctata, C. [= A.] q. podagrte, and C. [=Am- 

 phibolips'] q. inanis. 



46. WALSH, B. D. On the insects, coleopterous, hymenopterous, and 



dipterous, inhabiting the galls of certain species of willow. 

 Part 1st Diptera. <Proc. Ent. Soc. Phil., December, 1864, 

 v. 3, pp. 543-644. 



Structural characters, habits, metamorphoses, etc., of Cecidomyidw ; remarks 

 on the unity of habits in genera ; synopsis of cecidomyidous galls of Salix ; 

 descriptions of new species, their galls and inquilines ; for a list of the new 

 species, see the Systematic Index. See No. 197 for Part 2d. 



47. WALSH, B. D. The borer. <Colman's Eural World. Reprint; 



<Prairie Farmer, 6 May, 1865, v. 15, p. 355. 



Notice of soap as a nu-aus against borers. 



