354 On Certain Bacteria from the Air of New York City. 



29. Itlerismopedia rosea (Bumm). 



Occurrence. (1) " Sarcina rosea'' from the college collection. (2) "Micro- 

 coccus tetragemis ruber" from Krai's laborator}'. (3) TAvice in the air 

 of the college hallway. C4) In the air of an apartment house on West 

 69th St. (5 ) A contamination from the air of the laboratory. 



Morphology. Micrococci .7-1 ,« in diameter, in twos, fours and irregular 

 groui>s. 



Biology. Gelatin is very slowly li(][uefied, often not at all for thirty or forty 

 days. Some cultures liquefy more readily after having been in cultiva- 

 tion for some time. Nitrate is partly reduced, sometimes quite well, 

 never completely. Eosolic acid not changed. Growth on solid media- 

 rose pink, the color being somewhat absorbed by the medium in old cul- 

 tures. No surface growth on broth. 



Beinarks. I have identified this as the Diplococcus roseus of Bumm. 3Iicrocoe- 

 cus roseus Eisenberg, and Micrococcus tetragenus ruber Schneider seem to 

 refer also to this species. 



30. jWicrococciis tetragenus vividiis n. sp. 



Occurrence. (1) Four times in the air of the college hallway. (2) In the air 

 of an apartment house on ^\^ est 69th St. ( 3 ) From the air of one of the 

 lecture rooms (Dr. Cheesman). 



Morphology. Small Micrococci .5-.9 ,« in diameter, singly, in twos, threes or 

 irregular gi-oups, rarely in fours. 



Biology. Gelatin is liqiiefied vdih moderate rapidity, or rather slowly; nitrate 

 not or very slightly reduced. Growth on solid media vivid lemon yellow; 

 in broth a heavy yellow sediment without surface growth. 



Bemarks. Dr. Sternberg has included both this form and no. 32 in his descrip- 

 tion of Micrococcus tetragenus versafilis, but I have preferred to give them 

 distinctive names, following the general system adopted here. 



31. jWicrococcus tetragenus versatilis (Sternberg). 



Occurrence. (1) "Micrococcus tetragenus versatilis " from the college collec- 

 tion. (2) "Micrococcus tetragenus flavus " from Krrd's laboratory. 

 (3) Five times in the air of the college hallway. (4) In the air on 

 59th St. 



Morphology and biology as in no 30, but the growth is paler yellow of a more 

 normal tint, not unusually bright. 



32. Micrococcus tetragenus pall id us n. sp. 



Occurrence. In the air of one of the college lecture rooms (Dr. Cheesman). 



Morphology, ilicrococci .8-1 /' in diameter, in twos, more commonly in fours,, 

 occasionally in irregular packets. 



Biology. As in Nos. 30 and 31, but tlie growth is pale creamy yellow, ap- 

 proaching white. 



