TITLES. 
Ins. 55 
850. Thomson, C. G. Opuscula entomologica. Fasciculus xiv, pp. 1441- 
1534. Lund : 1890. 
The contents are : xlii, Cremastus och narstaende genera ; xliii, Ofver- 
sigt af arterna inom slagtet Bassus , Fab. ; xliv, Bidrag till Sveriges insect 
fauna. 
851. Titchener, E. B., & Finn, F. Comparative palatability of 
Insects, &c. Nature, Oct. 9th, 1890, pp. 571 & 572. 
Tosquinet, — . [See Jacobs & Tosquinet (393).] 
852. Trail, J. W. H. Scottish galls. Scot. Nat. 1890, pp. 226-232. 
853. Tutt, J. W. Melanism and Melanochroism in British Lepidoptera. 
Ent. Rec. i, pp. 5-7, &c. 
854. Uhagon, S. de. Ensayo sobre las especies espafiolas del grupo 
Cholevce. An. Soc. esp. xix, pp. 15-96. \Coleoptera^\ 
Uhler. [See Packard (588).] 
855. Urecii, E. Contribution h l’Ontog6nie des Insectes. Arch. Sci. 
Nat. xxiv, p. 526. 
A brief note bearing on the colours of Lepidoptera. Summary in J. R. 
Micr. Soc. 1891, p. 180. 
856. . Chemisch-analytische Untersuchungen an lebenden Raupen, 
Puppen und Schmetterlingen und an ihren Secreten. Zool. Anz. xiii, 
pp. 254-260, 272-280, 309-314, & 334-341. 
Summary in J. R. Micr. Soc. 1890, p. 450. 
857. Uzel, H. Monographic der Thysanuren Bohmens. SB. Bohm. 
Ges. 1890, pp. 3-82, pis. i & ii. 
This is entirely in the Bohemian language, with the exception of Latin 
diagnoses of the new species. 
858. Vayssiere, A. Monographie Zoologique et Anatomique du genre 
Prosopistoma , Latr. Ann. Sci. Nat. (7) ix, pp. 19-87, pis. ii-v. 
\_Neuroptera.'] 
Dovoted to the larva ; a second part, dealing with the imago, is to 
follow. 
859. Verhoeff, C. Ein Beitrag zur deutschen nymenopteren-Fa.uim. 
Ent. Nachr. xvi, pp. 321-336 ; Zusatze, t. c. pp. 382-386. 
860. Verrall, G. H. Critical notes on Diptera. Ent. xxiii, pp. 
150-154. 
861. Yerson, E. Hautdrusensystem bei Bombyciden. Zool. Anz. xiii, 
pp. 118 & 119. 
862. . Di una serie di nuovi Organi Escretori scoperti nell Filugello. 
Bull. Ent. Ital. xxii, pp. 3-29, pis. i-iv. [ Lepidoptera .] 
Summary in J. R. Micr. Soc. 1890, p. 712. 
863. . Der Schmetterlingsflugel und die sog. Imaginalscheibe der- 
selbe. Zool. Anz. xiii, pp. 116 & 117. 
