392 MR. F. DAY ON A NEW ENTOMOSTRACON. [May 4, 



5. On a new Entomostracon from Afglianistan. 

 By Francis Day, F.Z.S. 



[Eeceired April 13, 1880.] 



Among the zoological specimens kindly collected for ine by Dr 

 Duke in Afghanistan are several examples of a beautiful Entomostra- 

 con, which were captured in a pond near Kelat in April 1877. I 

 propose to call it 



Apus dukianus, sp. nov. 



Superiorly the general colour of the carapace is olive, the spinous 

 projections sienna, and the body and tail dull yellow. The largest 

 example is 1-4 inch long, 0-G inch in width, while the caudal 

 appendages are 07 inch in length. The longest appendage to its 

 front feet or rami 0*5 inch in length. The caudal portion of the 



A2nis duklanits. 



body is twice as loug as the carapace. The segments of the body 

 have each a transverse row of from 6 to 8 short spinous elevations 

 directed backwards, the lateral spine being that most developed. 

 The joints of the caudal ajjpendage are similarly but less strongly 

 armed to those of the body. The entire extent of the semilunar 

 notch at the posterior extremity of the carapace is armed with very 

 fine and short needle-like points, all being of about the same size ; 

 while under the microscope the hind portion of the carapace's outer 

 edge is also seen to be minutely and evenly armed with fine points. 



The great comparative length of the body of this species distin- 

 guishes it from known forms of Ajms, while its carapace is relatively 

 smaller and armature less developed. I have named it after Dr. 

 Duke, who transmitted the species to me. 



