FAMILY EARTOXELLACEAE 1111 



1917, 99.) From the hamster (Cricetus GrahameUa pipistrelli Markow. (Gra- 



phoca) in Transcaucasia. harnia pipistrelli Marlcow, Russian Jour. 



GrahameUa peromysci Tyzzer. (Proc. Trop. Med., 1926, No. 5, 52.) From the 



Amer. Philos. Soc, 85, 1942, 363.) From bat (Pipistrellus nalhusu) in Russia. 



the deer mouse (P. leucopusnovaboracen- GrahameUa rhesi Leger. (Bull. Soc. 



sis) m Massachusetts. p^^j^ E^^^., Paris, 15, 1922, 680.) From 



GrahameUa peromysci var. maniculati ,, , ,^r t, s • . 



,^^ . T^, ., o the monlcey [Macacus rhesus) in Annam. 



GrahameUa sanii Cerruti . (Arch. Ital . 



Tyzzer. (Proc. Amer. Pliilos. Soc, 85, 



1942, 365.) From the grav-backed deer . 



mouse (Peromyscus maniculatus) in ^ci. Med. Col.. //, 1930, 522.) From 



Massachusetts. Testudo graeca in Sardima. 



GrahameUa phyllotidis Tyzzer. (Proc. GrahameUa falassochelys Cerruti. 



Amer. Philos. Soc, 85, 1942, 371.) From (Arch. Ital. Sci. Med. Col., 12, 1931, 321.) 



the Peruvian mouse (PhyUotis darunni From Tallasochelys carelta in Sardinia. 



linatus). (Misspelled for Thalassochelys.) 



Genus IV. Eperythrozoon Schilling.* 



(Schilling. Klin. Wchnschr., 1928, 1854; Gyromorpha Dinger, Nederl. tijdschr. 

 geneesk., 72, 1928, 5903.) From Greek meaning animal on red blood cell. 

 Microscopic blood parasites found in the plasma and on the erythrocytes. They 

 stain well with Romanowsky type dyes, and then appear as rings, coccoids or short 

 rods, 1 to 2 microns in greatest dimension, staining bluish or pinkish violet. They 

 show no differentiation of nucleus and cytoplasm. The organisms are not known 

 to retain the violet in Gram's method or to be acid-alcohol-fast. Splenectomy ac- 

 tivates latent infection. Not cultivated in cell-free media, .\rthropod transmission 

 has been established for one species (Weinman, Trans. Amer. Philosoph. Soc, 

 N.S. 53, pt. 3, 1944. 321). 



The type species is Eperythrozoon coccoides Schilling. 



Key to the species of genus Eperythrozoon. 



I. Etiological agent of eperj^throzoonosis of white mice. 



1. Eperythrozoon coccoides. 

 II. Etiological agent of eperythrozoonosis of sheep. 



2. Eperythrozoon ovis. 



III. Etiological agent of eperythrozoonosis of cattle. 



3. Eperythrozoon wenyonii. 



IV. Etiological agent of eperythrozoonosis of gray-backed deer mice. 



4. Eperythrozoon varians. 

 V. Etiological agent of eperythrozoonosis of voles and dwarf mice. 



5. Eperythrozoon dispar. 



* This genus has been considered as belonging to the Protozoa by Neitz, Alexander 

 and Du Toit (Onderst. J. Vet. Sci., 3, 1934, 268) and to the bacteria by Mesnil (Bull. 

 Soc. Path, exot., 22, 1929, 531 and by Tyzzer (in Weinman, Trans. Amer. Philosoph. 

 Soc, N.S., 33, pt. 3, 1944, 244). The evidence at hand favors the inclusion of this 

 group among those organisms which are not protozoan in nature but which are closely 

 related to bacteria. 



