iç)i6.] 



Fauna of the Chilka Lake : Terrestrial Isopoda. 



475 



Although I have not been able to consult Budde-Lund's paper published in 1908 

 in which he gives figures of this species, I feel little doubt that the Lake Chilka speci- 

 mens belong to it. According to Budde-Lund, the species is very common in Mada- 

 gascar, and is also found in many localities in the East Indies. 



In general appearance, the specimens agree well with the short description given 

 by Budde-Lund in 1885. In most respects too, it evidently comes very near to Doll- 

 fus's Anomaloniscus ovatus, a species which Budde-Lund considers to be identical 

 with Alloniscus pallidulus, Budde-Lund. In establishing his genus, Dollfus called 

 attention to the fact that in the second, third and fourth segments of the body, in 

 the female, the side-plates were separated from the central portion of the segments by 

 a well-marked suture which was not observable in the males. In the Lake Chilka 

 specimens, even in females, there is no definite suture, only a somewhat indistinct 

 line on the second and third segments. The lateral processes of the head appear 

 much smaller and narrower than those represented by Dollfus for his species, and 



Fig. 25. — Alloniscus pigmentatus, seventh leg of male. 



for these two reasons I refer the specimens to A. pigmentatus rather than to A. palli- 

 dulus, although the two species seem pretty closely allied 



Under the circumstances it is not necessary to give a full description of the Lake 

 Chilka specimens, but as I have been able to examine male specimens, I give figures 

 of the parts of the male that differ from the female and of some of the other 

 appendages. 



The second antennae which are the same in both sexes are shown in figure 23 ; 

 the flagellum is rather shorter than the fifth joint of the peduncle, and has the three 

 joints subequal. In the mouth- parts, the first maxilla corresponds closely with the 

 figure given by Budde-Lund for this species in 1912 (pi. xxii, fig. 7), although I am 

 not clear what he means by saying that the exterior lobe " bears a little appendix 

 not before observed." The exterior lobe appears to present the usual characters, 

 and several of the inner spines of those at its extremity bear a small tooth near the 

 apex, as shown in Budde-Lund's figure ; this, however, is a character probably com- 

 mon to other species of the group. 



The first thoracic leg in the male (fig. 24) is somewhat long and slender and has 

 the merus and carpus subequal and considerably longer than the propod ; both merus 



