206 



5. On tli e hypopi of Glycyphagus and Aleurobius. 



In the Tijdschrift voor Entomologie, v. 46, p. 13, I mentioned 

 having got a bottle with rnauy thousands of hypopi of a very 

 Glycyphagus, »which I will describe afterwards." 



I theu, contrary to the opinion of Michael, was conviueed of 

 the fact, that not all the species of Glycyphagus had rudirnentary 

 hypopi, for niy bottle contained thousands of Glycyphagus sp., 

 and thousands of hypopi ! 



But, when the paper had already left the press, I came to the 

 discovery that I had been mistaken ; for the hypopi belonged to 

 Aleurobius farinae (L.). A few Glycyphagus were in the inert stage 

 and contaiued a rudimentary hypopus, perfectly as was observed 

 by Michael! and further the bottle contained also Aleurobius 

 farinae (L.) iu all stages of developrnent. 



Though I could not find a specimen of Aleurobius containing 

 a hypopus, nor a hypopus chauging in a nymph, though further 

 G. Canestrini describes the hypopus of Aleurobius as having »five pair 

 of suckers" (I presume one pair behind the other), I do not hesitate 

 to describe the hypopus found by me as that of Aleurobius farinae (L.). 



Therefore the »key" in the Tijdschr. v. Entom. v. 46, p. 13 is 

 wrong and must be annuled by the following one. 



6. Key to the genera of Tyroglyphinae ; hypopi. 



! Rudimentary, never free, enclosed in 

 hypopial case Glycyphagus Hering. 

 Well developed, free 2 



( Abdomen without sharp edges. . . 3 

 2 Abdomen with sharp edged margius, 



which can be sufflexed ventrally . 6 



! Behind the genital aperture a sucker- 

 plate 4 

 Behind the genital aperture two claspers 5 



