210 



have appeared, and a further criticism on the nomenclature adopted 

 R.A.E., B, X, 149] is offered. In his opinion attempts to distinguish 

 species by colour differences in the adults are not justifiable. Such 

 a distinction is permissible only where the new form is manifestly 

 different from known species, even assuming marked variation in the 

 latter. Otherwise specific differentiation should be based only on the 

 male genitalia and the larvae. The sexes should only be associated if 

 pairs are taken or if breeding from the same batch of larvae has been 

 carried out. The difficulty of the exact determination of the females 

 is such that geographical data based on this sex alone are seldom 

 permissible. 



The identity of several mosquitos is discussed on these lines. 



DiFFLOTH (P.). Les Parasites externes des Moutons. — La Vie Agric. 

 6- Rur., Paris, xxi, no. 34, 26th August 1922, pp. 146-149, 7 figs. 



This article describes the better known external parasites of sheep 

 and the measures usually adopted against them. 



DE Mello (F.) & GuiMARAis (A.). Constatatioii dans le Sang des 

 Exanth^matiques de nombreux Microorganismes ressemblant a des 



Rickettsia prowazeki. — C.R. Soc. Biol., Paris, Ixxxvii, no. 27, 

 22nd July 1922, pp. 707-709. 



Micro-organisms resembling Rickettsia prowazeki were found in the 

 blood of 12 out of 18 cases of t3^phus. 



DE SousA (J.). Presence de Rickettsia prowazeki dans le Sang des 

 Convalescents de Typhus exanth^matique. — C.R. Soc. Biol., Paris, 

 Ixxxvii, no. 27, 22nd July 1922, pp. 710-711. 



The blood of some 75 per cent, of convalescent typhus patients 

 harboured Rickettsia prowazeki for two or three days (in one instance 

 for seven days) following the absence of fever. 



GuiMARAis (A.). Flore microbienne du Phthirius inguinalis ; Remarque 

 sur des Elements de Nature rickettsienne. — C.R. Soc. Biol., Paris, 

 Ixxxvii, no. 27, 22nd July 1922, pp. 711-713. 



The intestinal contents of Phthirus pubis [inguinalis) taken from 

 healthy persons in a district of Portugal free from typhus (of which 

 this louse is not incriminated as a vector) contained quite typical 

 Rickettsian forms. 



Gedoelst (L.). a propos de la Larve de Gasterophilus pecorum, F. — 

 Ann. Soc. Ent. France, Paris, xc (1921), pt. 3-4, 1922, pp. 

 245-254, 2 figs. 



A re-examination of the type of Gastrophilus {Gasterophilus) pecorum, 

 F., at Vienna, shows Brauer's description of it to be inadequate, and 

 a redescription is therefore given. From this it would appear that 

 the species of Gastrophilus recorded by Brauer in 1896 and Sjostedt 

 in 1908 from Equus bohnii as well as G. pecorum var. zebrae, Rodhain & 

 Bequaert [R.A.E., B, ix, 44] are identical with G. pecorum, F. 



A description is also given of a second stage larva of G. pecorum 

 from Soutfi Africa, showing under the cuticle the spinulation charac- 

 teristic of the third stage. 



