THE ANIMAL PARASITES 
635 
Table 25. 
Heterakis in Pheasants. 
Species 
Total 
Infested 
Per cent, 
infested 
Golden Pheasant (Chrysolaphus amherstise) .... 
Amherst's Pheasant (Chrysolaphus pictus) 
Silver Pheasant (Gennaeus nycthemerus) 
Reeves' Pheasant (Phasianus reevesi) 
Ringnecked Pheasant (Phasianus torquatus) .... 
Swinhoe's Pheasant (Gennaeus swinhoii) 
18 
16 
19 
16 
12 
10 
12 
5 
1 
1 


67 
31 
5 
6 


Enzootics and en\4roimient played no part in the 
above figures. We have had no real heterakis enzootics, 
for in but two instances did three heterakis deaths occur 
in a year, and two deaths per year have occurred in but 
four instances in the past twenty years. During this time 
there have been sufficient animals on exhibition and sub- 
jected to autopsy to indicate definitely that the two species 
named — Amherst's and Golden, must be considered as 
more susceptible than the other varieties. Nearly all of 
the heterakis in quail likewise occurred in one species — 
seven of the ten cases occurred in a total of twenty-three 
Scaled Quail — but in these birds the inf estment appeared 
in enzootic form and cannot be \dewed as indicating a 
preference for a species. 
Psittaci are on the whole, not susceptible to worms. 
It is true that we suffered a serious outbreak of spiro- 
pteriasis a few years ago, but if we consider this a 
closed chapter we can accept the above generality as 
stated. Among 774 parrots autopsied we have encoun- 
tered but one cestode and three intestinal round worms. 
The deer, likewise, are singularly free from intestinal 
parasites. I gave the detailed records of these animals 
in Table 24 to emphasize the scarcity of parasites even 
when fairly numerous specimens had been available for 
examination. 
Other interesting features in the table are the out- 
standing infestments of squirrel monkeys and marmosets 
among the monkeys, of gastric and intestinal worms in 
the wild cats, and intestinal worms in the zebras. 
