286 EXPERIMENT STATION EECORD. 



The water tanks of the pigeon cotes lodge the parasite and form centers of in- 

 fection. It is thought tliat the parasite may be identical with the causative 

 agent of gregarinous diphtheria of birds. 



An affection known as botryomycosis and its parasite, G. Bureau and A. 

 Labbe iCompt. Rend. Acad. Sci. [Paris], l.',7 {IHOS). No. 16, pp. 697-699).— 

 Tliis disease is not a mycosis but is due to an amoeba. The botryomyces ob- 

 served in previous cases is only a plastoganiic stage of this organism. 



A study on the life history of a flagellate (Crithidia melophagi, n. sp.) 

 in the alimentary tract of the sheep tick (Melophagus ovinus), L. D. 

 Swingle (Jour. Infect. Diseases, 6 {1909). Ao. i. pp. DS-121, pis. J).— The life 

 history of C. inehtphagt has been worketl out and is here reported. The author 

 concludes that the sheep does not serve as a host of this flagellate. 



Development of Hemogregarina lacertae, A. Laveran and A. Pettit (Compt. 

 Rend. Acad. Sci. [Paris], Utl (1908), A'o. 25, pp. 1378-1382, flg.l).— The authors 

 discuss this subject at some length. They consider it probable that H. lacertcB 

 l)asses a part of its life cycle in the ticks that transmit the infection. The exact 

 manner, however, is unknown. An examination of 2 small ticks captured on an 

 infected Laceria viridis has not revealed in the digestive tract the existence of 

 any element that can be interpreted as a form in the life cycle of H. lacertw. 



Remarks on the avian hemoprotozoa of the genus lieucocytozoon, L. W. 

 Sambon (Jour. Trop. Med. and Hyg. [London], 11 (1908), Aos. 16, jrp. 2r.',5-2Ji8, 

 figs. 2; 21, pp. 325-328, figs. 9; 12 (1909), No. 3, pp. 37, 38, fig. 1).—A history of 

 observations of these parasites, in which their morphology and life history are 

 considered. Synonyms, hosts, and descriptions are given of the known species 

 and a bibliographical list api)ended. 



On the occurrence of nuclear dimorphism in a Halteridium parasitic in 

 the chaffinch, and the probable connection of this parasite with a trypano- 

 some, H. ^I. Woodcock (Quart. Jour. Micros. >S'cf. [London], n. scr., 53 (1909), 

 No. 210, pp. 339-3-'f9, figs. 8). — The author has obtained certain indications 

 which point to a transformation of Halteridium from a flagellate stage, thus 

 presenting the first definite piece of evidence tending to confirm one of Schau- 

 dinn's conclusions. The author concludes that Halteridium is probably a stage 

 in the life history of a trypanosome which 'has advanced a step further and 

 become adapted also to the red coriniscles. 



Trypanosomiasis in animals, F. Harvey (Jour. Roij. Army Med. Corps, 11 

 (1908), No. 1, pp. 12-23, figs. 3, map 1; Jour. Trop. Vet, 8ci., 3 (1908). No. J,, 

 pp. Jf68-.'f78, 2>?s. 5). — The author reports investigations made of a trypanosome 

 found in cattle, horses, and dogs in the British colony of Sierre Leone, Africa. 



" This trypanosome was found to increase in virulence by passage through 

 the same species. Guinea pigs appeared most refractory and puppies least so. 

 A natural strain from the horse appeared noninfective for dogs, but the cattle 

 and dog strains were infective for horses. It is possible, therefore, that these 

 may be two distinct strains; further work is required to settle this point. 

 This trypanosome appeared to be invariably fatal and most widely distributed, 

 and at one place, Minti, thei-e were only 2 dying cattle left out of GO." 



The species, which is nearly if not quite as virulent as Trypanosoma brucci, 

 is ^'onsidered as T. dimorphon, although clinically strikingly similar to nagana. 



A trypanosome from Zanzibar, 1). -Bruce, A. E. Hamerton, and H. R. Bate- 

 man (Proc. Roy. Hoc. [London], Her. B, 81 (1909), No. B 5-',5, pp. lJ,-30, pis. 

 2). — This is a study of a trypanosome taken from a horse in Zanzibar which 

 was suffering from an obscure disease. It is concluded that the species is 

 Trypanosoma dimorphon, although proof of the identity or uouideutity of the 

 carrier is wanting. 



