AUACIINIDA, 
253 
general habits indieated. They are all figured, with details of 
their structure, in the numerous plates (drawn by the author) 
with which the memoir is illustrated. These plates have been 
prepared by the process of photo-lithography. The author seems 
inclined to push the principles of generic division to their furthest 
limits. He adopts several of Koch’s genera which have been 
discarded by other writers, and proposes many new genera 
founded upon the most minute sexual characters. In his intro- 
duction, the author gives a general review of the literature of 
araclmology, with brief remarks on the various works cited ; he 
mentions Blackwalks ^ British ’Spiders,^ but adds that he is un- 
acquainted with it. This bibliographical section is followed by 
a general description of the external .and internal structure of 
Spiders, an account of the mode of life of these animals, and a 
brief notice of some of their parasites. These sections will be 
noticed hereafter. 
Nitzscii, C. L. Beobachtungen liber Vogelmilben. Zeitschrift 
fur die gesammten Naturw. xxiii. pp. 366-371 (1864). 
A posthumous publication by Giebel from Nitzsch’s MSS. 
Pracii, — . Monographie der Thomisiden (Krabbenspinnen) der 
Gegend von Prag, mit einem Anhange, das Verzeichniss 
der bisher in der Umgebung unserer Hauptstadt aufgefun- 
denen Araneen enthaltend. Verhandl. zool.-bot. Gesellsch. 
in Wien, Band xvi. pp. 597-638, Tafel 6. 
In this posthumous memoir, which bears date December 
1859, the author has described the species of the family Thomi- 
sides found within a radius of a mile and a half round Prague. 
He describes, in the first place, the external characters, then the 
anatomical structure, and, thirdly, the mode of life and develop- 
ment of the species of this family, and in the fourth section de- 
scribes systematically the genera and species, the latter twenty- 
one in number, of which seven, as the author states, were new 
to the Austrian fauna, and one of these a new species. The 
plate contains figures of the palpi, and other details of species 
belonging to each of the genera. In an appendix to the paper, 
the author gives a list of all the species of Spiders found up to 
his day in the immediate environs of Prague. 
Bobertson, Charles. Note on an undescribed species of 
Acarus found in the Pigeon (Columba livia). Journ. Microsc. 
Sci. n. s, vol. vi. pp. 201-203, cum fig. : April 1865. 
Simon, Eugene. Monographie des especes curopeennes du 
genre Pholcus, Ann. Soc. Ent. Prance, 4® ser. tome vi. 
pp. 117-124, pi. 2: August 22, 1866. 
. Sur quelques Araignees d’Espagne. Ibid. pp. 281- 
292, pi. 4 : October 24, 1866. 
Wilder, Burt G. On the Ncphila plumipes, or Silk-Spider. 
