ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 



143 



of the head and its appendages in Blatta americana and B. australasise. 

 There is no large new fact to report, but the description is exceedingly 

 careful and the figures are good. A structure hke the quadrilateral 

 tentorium inside the head is minutely described, and the mouth-region 

 (including tongue, hypopharynx, pharynx, as well as appendages), is 

 particularly well described. J. A. T. 



;3. Myriopoda. 



Vulvae of Diplopoda. — Henry W. Brolemann and Jean L. 

 LiCHTENSTEiN.(-'ircA. Zool. Exper., 1919, 58, 173-218, 31 figs.). A 

 detailed account is given of the integumentary differentiation around the 

 genital apertures of the females (when these do not lie on the second 

 pair of appendages, but behind these), which may be spoken of as the 

 vulva. The forms especially dealt with are Polydesmus coriaceus^ Sohizo- 

 phyllum sabulos'Utn, and Archispirostreptus tumuUporus sudanicus. What 

 has been called a gland is an apodermatous groove. There appear to 

 be associated sensory set^e. "With the groove or gutter minute glands 

 are associated, and the secretion may assist in the receiving of the sperms. 

 But there is nothing appendicular about the vulva. J. A. T. 



8. Arachnida. 



Water-mites from Peru and Brazil. — C. Walter {Revue Suisse 

 Zool, 1919, 27, 19-59, 45 figs.). This contribution to our knowledge 

 of the Hydracarina of a region that has been very slightly studied 

 includes descriptions of twelve new species of various genera {Limnesia, 



Ventral surface, Neocalonijx godeti g. el sp.n., male. 



Frontipoda, Hygrolates, Arrhenurus, Eylais, Kcenikea and Halacarus). 

 An account is given of Neocalonyx godeti g. et sp. n., which is related to 

 Calonyx. J. A. T. 



Cavernicolous Spiders. — Louis Fage {Arch. Zool. Exper., 1919, 58, 

 55-148, 7 pis., 48 figs.). An account is given of the cavernicolous 

 genus Troglohyphantes, and of its many species. They are very small 

 spiders, 2-4 mm. in length. Some of the species, but a minority, show 

 special features correlated with their life in caves — the de -pigmentation 

 of the chitin, the elongation of limbs and sensitive seta?, the reduction of 

 eyes (even to complete anophthalmia). Many species show no special 

 features that can be correlated with cave life. Most move slowly ; they 



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