196 



Nicholson (A. J.)- The Development of the Ovary and Ovarian Egg 



of a Mosquito, Anopheles macnlipennis, Meig. — Qtrlv. Jl. Micros. 



Sci., London, Ixv, pt. 3, N.S., no. 259, August 1921, pp. 395-448, 



4 plates. 



The examination of mosquito ovaries was begun with the object of 



finding out at what period these organs mature in the hibernating 



female so that an accurate date for the first oviposition of the season 



might be determined. 



The technique employed and the various stages of development, 

 as well as the anatomy of the structures involved, are fully described. 

 In Anopheles macnlipennis development generally begins about the 

 middle of March or beginning of April, but this varies according to 

 the season and locality. A meal of blood is essential for the produc- 

 tion of eggs. One meal is sufficient, and the eggs are fully developed 

 six days after it. 



Hirst (S.). On some new or httle known Acari, mostly Parasitic in 

 Habit— Proc. Zool. Soc, London, 1921, pt. 2, June 1921, pp 

 357-378, 15 figs. 

 The new species described include four species of Rhinonyssiis 

 from the nasal cavities of sea birds and plovers from the Shetland 

 Islands ; Liponyssits berlesei parasitic on Myospalax scamns in North 

 China; L. arahicns taken on a lizard {Agama adramitana) in South 

 Arabia; Listrophor us frontalis and L. argentinus parasitic on rodents 

 in Argentina ; Demodex chiropteralis on the long-eared bat {Plccotus 

 anritus) ; D. gliricolens on water rats {Arvicola amphibius) ; and 

 D. taipae from moles {Talpa europaea). 



A new genus, Acarapis, is proposed for Tarsonemus woodi, Rennie 

 [R.A.E., A, ix, 275, 338], and the structural differences between it 

 and Tarsonemus are described. 



Duncan (F. M.). On the Presence of two Spermathecae in the rare 



Mole Flea {HystricJiopsyUa taipae), and the Flea as Distributor of 



a Tyroglyphid. — //. R. Microscop. Soc, London, 1921, pt. 3, 



September 1921, pp. 245-247, 1 plate, 3 figs. 



Hystrichopsylla taipae is parasitic on moles and occasionally on 



field voles. It has also been found in nests of bumble-bees, into which 



it was probably carried by voles. 



Several hypopial nymphs of a Tyroglyphid mite were found clinging 

 to the abdomen of this flea. The species concerned is thought to be 

 related to Glycyphagus dispar, and H. taipae probably acts as its 

 natural distrilDutor. 



Pearce (E. K.). Typical Fhes : A Photographic Atlas. Second 



Sevies.— Cambridge, The Univ. Press, 1921, x -f 38 pp., 125 figs. 



Price 15s. net. 

 This volume is supplementary to a previous one with the same title 

 published in 1915, and endeavours to complete the series of t3qDical 

 British Diptera. The preface to the first series, containing instructions 

 for collecting and setting flies, and Brauer's Classification of Diptera 

 are reprinted from the preceding volume. The preface to the present 

 one includes a short hst of books that may be of use to the student. 

 Considering the difficulty of the subjects the photographs show an 

 unusual amount of detail, and each is supplemented by useful notes. 



