TITLES. 
Ins. 45 
678. Poppius, A. Ueber das Fliigelgeader aer finnischen Dendro- 
metriden. B. E. Z. xxxii, pp. 17-28, pi. i. • [Lepidoptcra.] 
A discussion of wing-neuration in Geoinetridce in connection with 
Redtenbacher’s views. 
679. Pouchet, G. Sur la nature du to3t des Arthropodes. C.R. Soc. 
Biol. (8) v, pp. 685-688. 
Homologies of parts of the external skeleton of Arthropods have not 
so high a value as homologies of the vertebrate skeleton. 
680. Poujade, G. A. Nouvelles especes de PUride, et de Noctuilide. 
Bull. Soc. Ent. Fr. (6) viii, pp. xix & xx. [Lepidoptera.] 
Poulain, — . [See Loriferne & Poulain (522).] 
681. Poulton, E. B. Further experiments upon the protective value 
of colour and markings in Insects. Rep. Brit. Ass. 1887, pp. 763-765. 
Relates to the paper recorded in Zeol. Rec, xxiv, Insecta, Titles (578). 
682. . The secretion of pure aqueous formic acid by Lepidopterous 
larva for the purpose of defence. T. c. pp. 765 & 766. 
Includes analysis of the secretion, and particulars as to the rate of its 
production. 
683. . Notes in 1887 upon Lepidopterous larvae, &c., including a 
complete account of the life-history of the larvae of Sphinx convolvuli 
and A glia tan. Tr. E. Soc. 1888, pp. 515-606, pis. xv-xvii. 
Contents : — 1. The ontogeny of Sphinx convolvuli. 2. The ontogeny 
of Aglia tau. 3. The natural position of the Sphingidce. 4. The cause 
and meaning of the Sphinx-like attitude. 5. The graphic method of 
representing the growth of lepidopterous larvae. 6. The means of defence 
adopted by the larva of Stauropus fagi. 7. The meaning of the black 
colour of the eggs of Paniscus ccplialotes. 8. The defensive value of 
“ Tussocks,” and the associated black intersegmental markings. 9. The 
meaning of the peculiar method of progression in the larvae of Cochlio- 
podidee. 10. The protective resemblances of the larvae of Geometra 
papilionaria. 11. A proof of the protective value of dimorphism in 
larvae. 12. The protective resemblance of the pupa of Apatura iris. 
13. The defensive secretion of the larvae of Crccsus varus. 14. The 
geometric form, structure, and attitudes of the larva of E udidia mi. 
15. The determination of sex in certain living lepidopterous larvae. 
Noticed in J. R. Micr. Soc. 1889, p. 206. 
684. ^'Preiss, P. Abbildungen ansehnlicher Vertreter der exotischen 
Nachtschmetterliuge. Coblenz. [ Lepidoptcra . Cf. Soc. Ent. iii, 
P- 61.] 
Prince, H. [See Olliff & Prince (637).] 
685. Provancher, L. Petite faune entomologique du Canada. 
Cinquieme ordre. Les Hemiptercs, pp. 185-204. 
686. . Additions a la faune hynienopterologique , pp. 273-440. 
This includes several new species from Trinidad. 
