FRESH. WA TER CR US TA CEA. 



837 



shield which \nA. granarius Are few and very minute. In view of these differen- 

 ces I regard A. granarius, Sars, as distinct from A. granarius, Lucas, and for that 

 reason I have reluctantly introduced a new name. 





Fig. 1. Last Abdominal Segment of Apus asiaticus O . A=Dorsal view. 

 B:= Ventral view. 



[Next Segments :— No. 3—11 spines, No. 4- 9, No. 5 — 10, No. 6—9, No. 7— 

 9, "No. 8—11, No. 9—9, No. 10-9, No. 11—11, No. 12--11, No. 13—11.] 



I was at first inclined to refer these specimens to A. dukianus, Dav, but 

 have had the opportunity of examining the type of that species, which proves 

 to be entirely distinct. The following measurements, together with figures of 

 the last abdominal segment, are given for purposes of comparison with the 

 description and figures of Prof. Sars : — 



.^3 



o ^ 





Male 



Female . 



15 



13 



18 



16 



13 



12 



35 



27 



G 



! -C I O 



•« c 



C '- 



\"* 'o 







M) 





20 



15 



28 



25 



(Meas urem e'nts in Millimetres.) 



12 



44 



44 



10 



The species is closely related to Apus numidicus, Grnhe which appears to range 

 from South Africa to Central Asia, but I believe that two or more distuict 



