REVIEW OF GENUS ARGULUS — MEEHEAF 



483 



Swimming appendages with flagella. Fourth leg with posterior 

 boot-shaped lobe in female, with toe drawn into a long fingerlike 

 tapering process. On third appendages of male (fig. 24, h) the pre- 

 coxa is slightly broadened ; the coxa is rounded posteriorly where the 

 socket is located, with a meager swelling anteriorly. On the fourth 

 appendages is a posterior bilobed process with a scant lateral pro- 

 longation suggestive of the female. There is a small chitinous ridge 

 around the peg. The peg itself originates a short distance back from 

 the distal edge of the basis and projects ventrally against the anterior 

 surface as a short fingerlike papilla. 



The female is up to 6.55 mm. and the male up to 3.5 mm. Taken 

 on Cirrhma sp. and Triehopodus sp. from fresh water at Bangkok, 

 Si am. 



ARGULUS INDICUS Weber 

 FiGUBE 25 



Argulus indicus Webek, 1892, p. 544, fig. 1. — Van Kampen, 1909, p. 447, figs. 5, 

 6.— Wilson, 1927, p. 1, pi. 1. 



Figure 25. — Argulus indicus: a, Respiratory areas; b, ribs of sucking cups; c, antennae. 



Carapace broadly rounded, alae covering over half of abdomen so 

 that the whole animal is almost inclusive in a circle. Cephalic area 

 prominent; dorsal ridges branched anteriorly; eyes small, without 

 much pigment; abdomen wider than long, sinus deep, sides diverg- 

 ing, anal furcae subterminal. Wliole animal dark colored, flecked 

 with black. Anterior respiratory area minute, about opposite the 

 second maxillae, posterior oblong" area very large (fig. 25, a). Only 

 the female is known. It measures about 7.75 mm. The host is 

 Betta sp. from near Bangkok, Siam. 



Lateral hook on first antennae short, without an anterior knob; 

 basal and post antennal spines large; flagellum of first antennae 



201701—40 4 



