464 C. D. SOAR ON HTDRACHNID LARVAE IN THE STOMACH OF A TROUT. 



at present in a position to say to what species they belong, 

 although they seem to me to be very close to the larval forms of 

 Neumaniaj a sub-genus of Atax. I sent some of the mites to Dr. 

 Koenike, of Bremen, thinking that perhaps he had seen this 

 particular larva, and that he might be able to give me its name. 

 Dr. Koenike does not know it, however, but thinks that it is a 

 stage in the development of a " thick-skinned fresh-water mite 

 (AiThenurus ?) " and bases his opinion on the presence of a distinct 

 dorsal plate. 



Fisr. 1. — Dorsal surface. 



Fig. 2. — Palpus. 



Fig. 3. — Posterior ventral surface. 



Fig. 4. — Ventral surface. 



But whatever its specific name may be, it is no doubt the larval 

 form of a fresh-water mite, and I think it advisable to publish 

 this note in order that collectors may be put on the look-out for 

 other larval forms in the stomachs of trout and other fishes. 



Length of larva 0*42 mm. 



Joum. Qvekett Microscopical Club, Ser. 2., Vol. VII I., No. 52, April 1003. 



