20 Transactions of (he Society. 



me for the first time (as far as I know), is closely allied to tbat of 

 Kramer's T. Carpio, and the hypopial nymph is the " Parasite of 

 an Orihata," of Canestrini and Fanzago. 



Finally, it appears to me that Kilcy has really recorded a new 

 species, although he does not claim to have done so, and I propose 

 to call it T. corticis. 



Ehizoglyphus Eobini. 



There is another member of the family of Ti/ror/JijphidcV which 

 has been making itself unpleasantly conspicuous in this country in 

 1884. It was first described by Clai^arede * in 18 OS ; he found it 

 upon hyacinth, potato, and dalilia roots ; he describes it, names it, 

 and figures both the male and female with his accustomed skill 

 and exactitude, but, by some strange error, he has misplaced the 

 sexes, calling the male the female, and vice versa. This does not 

 appear to be a mere printer's error : had the able Swiss naturalist 

 seen the female with fully developed eggs in the oviducts, as I have 

 done very frequently of late, it could not have occurred ; but 

 possibly Claparede, who after all was not a speciahst in the study 

 of the Acarina, was somewhat misled as to the whole sex question 

 in the Tyroghjphidse, by the error he fell into in supposing 

 Hypopus to be the male of Tyroghjplius. I have not even noticed 

 the species in England until 1884, but it may probably have existed, 

 for I have not ever searched for it. In the latter half of 1884 I 

 have been receiving it from numerous quarters, always accompanied 

 by complaints of the damage it was doing. The first instance 

 came from the IJuke of Sutherland's famous hot-houses at 

 Trentham. Mr. Stevens, the skilful and energetic head of that 

 establishment, found the Eucharis bulbs in their hot-houses 

 attacked, and sent some to Mr. E. Bostock, of Stone, for micro- 

 scopical examination. That gentleman detected a Wiizoghjphus, and 

 despatched the bulb to me in order that I might identify the 

 species. Mr. Bostock also sent me about the same time a hyacinth 

 bulb for examination for other purposes, which I found to be 

 swarming with the same Acarus. About the same time I received 

 it from Exeter, from Mr. Parfitt, and from numerous other 

 sources. The mite not merely attacks the exterior of the bulb, but 

 also forces itself in between the scales, and thus devours the fleshy 

 parts of the interior, the wounds thus caused becoming coated 

 in the case of the Eucharis bulbs with a hard brown gummy 

 matter. The hyacinth bulbs were utterly destroyed. It would 

 seem wise therefore that at present importations of Dutch or 

 other European bulbs should be submitted to some examination 



* " Studicn an Acariden," Zeitsclir. f. Wiss. Zool., xviii. (1868) p. 506, 

 pi. xxxviii., tiga. 7-11. 



