292 
Haemogregarines in Snakes 
I have seen no differentiated “ males ” and “ females ” as described by 
Prowazek. Doubly infected corpuscles (Fig. 15) were several times seen. 
Miss Robertson (1906) has described a haemogregarine-like organism 
from Python sp. under the name “ Trypanosoma j^ythonis.” It has a 
well-marked kinetonucleus, but I think it is premature to place it in 
the genus Trypanosoma at present. The animal does not appear to be 
the same as mine. 
III. Haemogregarina sp. from Coluber quatuorlineatus. 
(Plate XX, Fig. 16.) 
Haemogregarines have not previously been described from this 
snake, though they have been found in allied species. I have only been 
able to examine a single snake, and that was only very slightly infected. 
A blood smear (2x1 in.) showed usually but a single parasite after 
careful searching. All the animals seen were at the same stage in 
development, and presented the appearance of an ordinary haemogre- 
garine (Fig. 16). There was never any indication of a blepharoplast. 
A single Coluber mela.noleucus was examined with negative results. 
In conclusion, I wish to thank Mr W. A. Harding for his kindness 
in allowing me to examine the snakes in which the parasites herein 
described were found. 
LIST OF SNAKES INFECTED WITH HAEMOGREGARINES 1 . 
(In alphabetical order.) 
Haemogregarine 
“ Haemosporidia ” (Langmann 1899). 
“ Haemosporidia ” (Langmann, 1899): Haemogregarina 
mocassini (Laveran 1902). 
“ Drepanidiumserpentium ” (Lutz 1901): “ Haemogregarina 
terzii ” (Sambon 1907) : Haemogregarina sp. (Dobell). 
Haemogregarina sp. (Patton). 
“ Laverania ” bungari (Billet 1895) = Haemogregarina 
bungari (Labb6 1899). 
[Coluber aesculapii: see C. longissimus.~\ 
Coluber cor ais ... ... “Haemosporidia” (Langmann 1899): “ Drepanidium 
(=Spilotes couperi ) serpentium” (Imtzl901) :“Haemogregarinararefaciens” 
(Sambon 1907). 
1 The haemogregarines referred to Patton, are quoted from a personal communication 
from Capt. W. S. Patton, I.M.S., who is recording his observations elsewhere. 
Snake 
Ancistrodon contortrix 
Ancistrodon piscivorus 
Boa constrictor 
[Bothrops : see Lachesis .] 
Bungarus candidus 
Bungarus fasciatus 
