219 



Eavlovsky (E.) & Stein (A). Des Causes de rApparition des Taches 

 bleues chez THomme. — Bitll. Soc. Path. Exot., Paris, xv, no. 7, 

 12th July 1922, pp. 558-560. 



Experiments to attempt to determine the cause of the appearance of 

 blue patches on the skin in persons that have been bitten by Phthims 

 pubis are described. Injections of extract from the salivary glands 

 of the louse gave positive results, but this was not the case when 

 extract from the stomach was used. 



RoDHAiN (J.). La Subsistance de V Ornithodorus mouhata sur des 

 Reptiles et des Sauriens. — Bull. Soc. Path. Exot., Paris, xv, no. 7, 

 12th July 1922, pp. 560-564. 



Further studies have been made in the rearing of Ornithodorus 

 mouhata on cold-blooded animals [R.A.E., B, x, 44]. The experiments 

 described show that the blood of lizards, geckos and snakes is digested 

 by this tick practically as easily as that of the guinea-pig ; that of 

 the chameleon, however, is digested with difficulty and is toxic, its 

 absorption being followed by a pseudo-lethargic condition, many ticks 

 succumbing after a full meal. Nymphs of 0. moubata having fed for 

 three successive meals on the snake, Causus rhombeatus, developed in 

 5^ months to practically the same proportions as nymphs of the same 

 age fed on guinea-pigs and rats ; young ticks feeding on snakes, however, 

 died in much greater numbers than those engorging on these mammals. 

 Further experiment has shown that 0. moubata can nevertheless 

 adapt itself to living on chameleon blood, although the ticks occurring 

 in habitations may find it toxic when absorbed for the first time ; 

 digestion, however, is always slow and difficult, and individuals fed 

 exclusively on this diet develop slowly. It remains to be discovered 

 whether females reared on chameleons and fertilised by males fed on 

 the same host can produce eggs giving rise to larvae that will survive. 

 The fact that an individual of 0. moubata nourished exclusively on 

 chameleon from birth up to 16 months can then engorge without 

 difficulty on a mouse proves once more the wide range of hosts of 

 these ticks. 



RoDHAiN (J.). L'Ubiquisme parasitaire de V Ornithodorus moubata 

 peut-il influer sur son Infection par le Spirochete de Button ?— 



Bull. Soc. Path. Exot., Paris, xv, no. 7, 12th July 1922, pp.564-565. 



Further experiments with the tick, Ornithodorus moubata [see 

 preceding paper] have shown that an adult, reared on a chameleon 

 from its first nymphal stage, becomes infected with spirochetes the 

 first time it feeds on an infected mammal. It is probable that the 

 absorption of chameleon blood by ticks already infected with spirochetes 

 in no way influences the infective power of the ticks. Further experi- 

 ments are to be made, and these will probably confirm the theory 

 that the wide range of hosts of this tick has no bearing on its role as 

 a vector of spirochetes. 



RouBAUD (E.) & Descazeaux (J.). Evolution de 1' Habronema muscae, 

 Carter, chez la Mouche domestiaue et de VH. microstomum, 

 Schneider, chez le Stomoxe. (Note preliminaire.) — Bull. Soc. 

 Path. Exot.. Paris, xv, no. 7, 12th July 1922, pp. 572-574. 



In continuation of the study of the development of Habronema 

 megastomum in Musca domestica [R.A.E., B, x, 12] the development 



