35 
J. A. Arkwright, E. E. Atkin and A. Bacot 
put into a new genus by Wolbach and on the other hand the form in the sheep 
“ked” which is not believed, however, to infect the sheep has been called 
Rickettsia melophagi it will be useful to retain Rickettsia as a group name for 
all in the present state of our knowledge. It is in this latter sense that we use 
it in tentatively naming the above-described parasite of the bed-bug Rickettsia 
lectularia. 
Postscript. 
A recent examination of the few specimens of Cimex hirundinis which 
comprise all the bugs of the genus Cimex, apart from C. lectularius we have 
been able to obtain up to the present, shows that this species is also parasitised 
in some of the same organs which are infected in C. lectularius. As both the 
ovaries and testes are involved it is very probable that this will also prove 
to be an hereditary infection. The organism is,‘however, much more bacillary 
in appearance, considerably larger in size and has different staining reactions; 
in spite of several similarities it is not possible in the present limited state of 
our knowledge to decide how nearly, if at all, it may be related to the organism 
described above. We hope to obtain further material to continue our research 
and should any of our readers be able to obtain living specimens of any of the 
species within the genus Cimex, other than lectularius, we shall be very grateful 
to them if they will send us some. 
REFERENCES. 
Jungmann, P. (1918). Untersuchungen liber Schaflausrickettsien. Deutschemed. Wochenschr. 
49, p. 1346. 
Krumwiede, Jr. C. and Pratt, Josephine (1913). Fusiform Bacilli, Isolation and Cultiva¬ 
tion. Journ. Inf. Dis. xn. 200. 
Munk, F. und da Rocha-Lima, H. (30. x. 1917). Klinik und Aetiologie des sogen. “Wol- 
hynischen Fiebers” (Werner-Hissche Krankheit). II. Ergebnis der atiologischen 
Untersuchungen und deren Beziehungen zur Fleckfieberforschung. Mmichen. med. 
Wochenschr. p. 1422. 
Noeller, W. (1917). Blut und Insektenflagellaten Zuchtung auf Flatten. Arch. f. Schiffs- 
u. Trojp. Hyg. xxi. 53. 
Ricketts, H. T. (30. i. 1909). A micro-organism which apparently has a specific relationship 
to Rocky Mountain Spotted Fever. Journ. Amer. Med. Assoc, lii. 379. 
da Rocha-Lima, H. (22. v. 1916). Zur Atiologie des Flcckfiebers. Berlin klin. Wochenschr. 
liii. 567. 
Sergent, Edm., Foley, H. et Vialatte, C. (13. vi. 1914). Sur les formes microbiennes 
abondants dans le corps de poux infect^s par le Typhus exanthematique et toujours 
absentes dans les poux temoins non-typhiques. C. R. Soc. de Biol, lxxvii. 101. 
Sikora, H. (xii. 1918). Beitrage zur Kenntnis der Rickettsien. Arch. f. Schiffs - u. Troy.- 
Hyg. xxn. 442. 
Toepfer, H. 11916). Zur Atiologie des Febris Wolhynica. Berl. klin. Wochenschr. p. 323. 
- (1917). Ursache und Uebertragung der Kriegsnephritis. Med. Klinik. p. 678. 
Wolbach, S. B. (1919). Studies on Rocky Mountain Spotted Fever. Journ. Med. Research , 
XLI. 1. 
Wolbach, S. B. et Todd, J. L. (iii. 1920). Note sur l’6tiologie et l’anatomie pathologique 
du typhus exanthematique au Mexique. Ann. de VInst. Past, xxxiv. 153. 
3—2 
