G. W. McCoy and M. B. Mitzmain 
303 
Distribution of rat fleas on guinea-pigs. 
Geoup 1. 
Head and Neck 
No. of guinea- 
pigs in group 
Fasc. Cheap. 
M F M F 
1 2 — — 
Mus. 
M F 
Ceratophyllus fasciatus. 
Fore Quarters 
^ - r - - 
Fasc. Cheop. Mus. 
M F M F M F 
2 6 — — — — 
Hind Quarters 
Fasc. Cheop. 
M F M F 
11 37 — — 
Mus. 
M F Total 
Total both sexes 
8 
Group II. Loemopsylla clieopis. 
— 2 1 — — — — 3 6 — - 
48 
59 
— 10 33 — 
Total both sexes 
43 
55 
Group 3. Ceratophyllus fasciatus, Loemopsylla clieopis and Ctenopsyllus musculi. 
10 1 2 1 3 — 10 10 13 — 3 — 4 13 45 2 10 — 
Total both sexes 
No. g.-pigs combed 
28 2 4 3 4 
10 23 3 4 
Summary of three groups. 
— 10 12 19 3 9 - 
58 
12 
117 
4 24 82 12 43 
Total both sexes 
10 
31 
12 
106 
55 
231 
These figures yield the following percentages: 
C. fasciatus 
L. cheopis 
Ct. mufeuli 
Head and Neck 
4% 
10 °/o 
72 «/ 0 
Fore Quarters 
22 
16 
28 
Hind Quarters 
74 
74 
0 
Summary and Conclusion. 
It would appear from the data presented that the favourite location 
for the common rat fleas of this vicinity, Ceratophyllus fasciatus, Bose., 
and Loemopsylla cheopis, Roth., is about the hind quarters of the rat, 
while Ctenopsyllus musculi (Duges), Wagner, prefers the region of the 
head and neck. 
The same regional distribution of rat fleas was found in the case of 
O 
the guinea-pigs. 
