HYPOPIDyE. 



239 



:ase as usual, a close resemblance to the mother Tyroglyphus, as well as 

 to the correspoPxding six-footed stage of other Tyroglyphi, such as 

 the cheese mite; and he observed in them the development of the 

 second larva, which appears with eight feet, and which bears an 

 even greater similarity to the perfect female Tyroglyphus. There- 

 after he followed the further develop- 

 ment of this second larva, and traced 

 the progress of its included nymph or 

 quasi nymph, and was witness to the 

 appearance of mature female Tyro- 

 glyphi from many of them; but from 

 others, on the contrary, there emerged 

 Hypopi. " There could no longer be 

 any doubt," 

 thought he, 

 " that the 

 Hypopus 

 belongs to 

 the cycles 

 of develop- 

 ment of Tyroglyphus," and seeing no other way of explain- 

 ing or reconcihng the facts he had observed, he arrives at 

 the conclusion that Hypopus must be the male form of Tyro- 

 glyphus. 



That Claparede was wrong in this conjecture was very quickly 

 proved. Two observers of the highest competency, Professor 

 Robin and M. Fumouse, had been studying the same Tyroglyph 

 as Claparede at the very same time, and in the same year they 

 published the result of their researches, and we believe their paper 

 had the priority by a few months.* 



Hypopus removed from inside of 



Tyroglyphus. 



Copied from Claparede. 



Development of Hypopus, inside 

 Tyroglyphus echinopus. 

 Copied from Claparfede. 



* It appeared in the Journal de I'Anat. and Physiol, de C. Robin, in the 

 number for May and June 1868 ; Claparede's appeared in the Zeitschrift fi-r 

 Wiss. Zool. Ed. xviii., 1868. We do not know the month, but presumably Tit 

 the end of the year. 



