Acid from glucose, fructose, maltose and sucrose. Optimum temperature, 37° C. Grows at 22° C. Aerobic, facultatively anaerobic. Source: Nasopharynx, saliva and sputum. Habitat: Mucous membrane of the respi- ratory tract of man. Optimum temperature, 37° C; grows well at 22° C. Aerobic, facultatively anaerobic. Serologically, a homogeneous group. Source: Cerebrospinal fluid in cases of meningitis. Habitat: Probably mucous membrane of respiratory tract of man. 5. Neisseria haemolysans Thj0tta and Boe, 1938. (Acta path, et microbiol. Scand., Suppl., 37, 1938, 527.) hae.mo'ly.sans. Gr. noun haema blood; Gr. V. lyo to loose; M.L. part. adj. haemoly- sans dissolving blood. Spheres, 0.6 to 1.0 micron or more in di- ameter, occurring singly and in pairs with adjacent sides flattened. Type strain shows some very large cells. Gram-negative. Blood agar colonies: Smooth, non-chro- mogenic, surrounded by a zone of clear beta hemolysis by the second or third day. Growth slow and delicate. Gelatin not liquefied. Acid from glucose, fructose, maltose and sucrose, but not from any other carbohy- drate. Indole not produced. Nitrites not produced from nitrates. Aerobic, facultatively anaerobic. Source: Bronchial secretions, nasophar- ynx. Habitat: Human mucous membrane of the respiratory tract. 6. Neisseria flavescens Branham, 1930. (U. S. Public Health Service, Pub. Health Reports, 45, 1930, 845.) fla.ves'cens. L. v. flavesco to become golden yellow; L. part. adj. flavescens be- coming golden yellow. Biscuit-shaped cocci occurring in flat- tened pairs; usually 0.6 to 1.0 micron in di- ameter. Gram-negative. Glucose agar: Poor growth. Blood agar: Grows well, colonies less noist and less transparent than those of the meningococcus. Develops a golden yellow pigment. Is greenish yellow on Loeffler's blood serum medium. Semi-solid agar: Good growth with pel- licle formation. No acid from any carbohydrates. 7. Neisseria caviae Pelczar, 1953. (Neis- seria from guinea pig, Pelczar, Hajek and Faber, Jour. Inf. Dis., 85, 1949, 239; Pelczar, Jour. Bad., 65, 1953,744.) ca'vi.ae. M.L. fem.n. Cavia generic name of the guinea pig; M.L. gen. noun caviae of Cavia. Spheres, 0.6 to 1.0 micron in diameter, occurring predominantly in pairs with flat- tened sides, though small clusters of cells are present. Gram-negative. Trypticase soy agar colonies: Approxi- mately 2 mm in diameter, circular, convex, entire with smooth glistening surface. Con- sistency butyrous, becoming viscid. Chromogenesis : Growth on Loefiier's slants is a distinct light caramel to dirty brown color. Distinctly different from the grayish white or yellow to yellowish green chromogenesis of other species in the genus. No acid from any carbohydrate. Positive oxidase test with para-amino- dimethylaniline monohydrochloride rea- gent. Hemolysis: Some strains weakly hemo- lytic against rabbit blood. Optimum temperature, 37° C; grows at 22° C. Aerobic, facultatively anaerobic. Source: Isolated from the pharyngeal region of guinea pigs. Habitat: Pharyngeal region of guinea pigs and perhaps also in the pharyngeal region of other animals. 8. Neisseria subflava Bergey et al., 1923. (Chromogenic group III, Elser and Hun- toon, Jour. Med. Res., £0 (N.S. 15), 1909, 415; Bergey et al., Manual, 1st ed., 1923, 44.) sub.fla'va. L. prefix sub less than, some- what; L. adj. flavits yellow; L. adj. subflaviis yellowish. Spheres, 0.6 to 1.0 micron in diameter,
