1920.] N. ANNANDALE & S. L. Hora: The Fish of Setstan. 173 
Schizothorax zarudnyi is a gregarious fish abundant in an 
adult condition in the pools among the reed-beds of the Hamun- 
i-Helmand. ‘The roe appeared to be ripe in specimens examined 
in December. Its food, unlike that of most species of its genus, 
consists largely if not exclusively of other smaller fish. From the 
fact that only adults were taken in the Hamun in winter, it is 
probable that the young make their way up stream in the flood- 
season. ‘They are extremely abundant in pools left in the beds of 
effluents of the Helmand or in the desert near these effluents, 
when the floods subside. It seems probable that the specimens 
we have examined represent the growth of at least five years and 
that sexual maturity is not obtained in a shorter period than 
four years. If this be so, the young of a year old are about 56- 
66 mm. long; those of two years from gt to 95 mm., and those 
of three years about 125 mm. 
Both large individuals from the Hamun and young ones froni 
small pools were infested by an immature Trematode, which was 
encysted in their skin, in the superficial muscles, in the membrane 
of the fins and on both the outer and the inner aspect of the 
operculum. ‘The cysts were of a blackish colour and resembled 
those shown in Herzenstein’s figure of S. alttor (op. cit., pl. xii, 
fig. 1). We hope that a description of this parasite will be pub- 
lished later. 
S. zarudnyi is the only fish commonly caught for food in 
Seistan. A description of the methods by which it is caught will 
be found in the appendix to this paper. 
Schizopygopsis stoliczkae, Steind. 
1888. Schizopygopsis stoliczkae, Herzenstein, op. cit., p. 191, pl. xvi, 
eee 
IQII. Siiisony corse stolicskae, Stewart, Rec. Ind. Mus., VI, p. 73, 
pl. iii, figs. 1, 2 and 3. 
Specimens from Seistan, whence we have examined a faily 
large series, apparently represent a dwarfed race. The largest we 
have seen is only 195 mm. long, and even smaller individuals 
are sexually mature. The two types of head referred to by 
Stewart (op. cit.) as the stoliczkae and the sevewzovi type are 
both found, without intermediates, in our series, but the former 
occurs only in two specimens and is not correlated with differences 
in proportions. We can discover no structural peculiarity in this 
low-altitude race except that there is a regular double row of large 
scales extending forwards in continuity with the anal sheath as 
far as the base of the ventral fins. Traces of a similar forward 
extension of the sheath are, however, to be found in certain speci- 
mens from high altitudes in the large collection from various. 
localities preserved in the Indian Museum. We do not, therefore, 
consider it advisable to give the Seistan fish a racial name. 
The series was collected by the Seistan Arbitration Commis- 
sion in the delta of the Helmand. The species has a wide range in 
