DESCRIPTIONS OF GENERA AND SPECIES. 227 



Founded on Adult. 



Dermacarus, 1880. Haller, " Zur Kenntniss der Tyroglyphen und 

 Verwandten," ' Z. wiss. Zool.,' vol. xxxiv, pp. 268 

 273. 



1899. Kramer, 'Thierreich,' Lief. 7, p. 150. 

 Homopus* 1888. Canestrini, ' I Tiro,' p. 6 ; ' Pros.,' p. 354. 

 LabidophorusJ 1898. Oudemans' ' List,' p. 265. 

 Glyciphagus (part), 1886. Michael, " Upon the Life-history of an 

 Acarus, one stage whereof is known as Labi- 

 dophorus talpse, etc.," in ' J. B. Micr. Soc.,' 

 London, ser. ii, vol. vi, pp. 377 390. 



Glycyphagus (part of), sub-genus Homopus, 1897. Berlese, ' A. M. 

 S. Crypt.,' p. 106. 



Founded on Hypopial Nymph only. 



Dermaleichus, part, 1841. Koch, D. C., fasc. xxxiii, No. 7. 



,, part, 1879. Canestrini, " Intorno ad alcuni Acari 



parasiti," in ' Atti Soc. Veneto-Trent,' vol. 

 vi, fasc. 1, p. 13. 



Homopus, 1842. Koch, ' Uebersi,' Heft 3, p. 121. 

 1844. Koch, D. C., fasc. xxxix, No. 24. 



Labidophorus, 1877. Kramer, " Zwei parasitische Milben des 

 Maulwurfs," in * Arch. Nature.,' Jahrg. 43, 

 pp. 248-259. 



It will be seen that the first notice of any stage of 

 the creatures forming Haller's genus Dermacarus, but 

 here included in Glycyphagics, was by C. L. Koch, who 

 in 1841 found the hypopial nymph of Cr. sciurinus and 

 supposed it to be an adult creature ; he included it in 

 the genus Dermaleichus ; probably only from its para- 

 sitic habits. It must be remembered that at this time 

 the genus Hypopus, as it was then called, was looked 

 upon as being composed of adult creatures ; Koch 

 supposed them to be allied to Uropoda ; deceived 

 probably by a considerable resemblance in general 

 external appearance on the dorsal surface ; he evidently 

 soon saw that the creatures did not belong to Derma- 

 leichus, but were very like Hypopus ; but he must have 

 seen, correctly, that * there was a difference between 

 them and other Hypopi ; he therefore originated the 



* Name preoccupied by Dumeril and Bibron in 1835 for a genus of 

 reptiles, ' Erpetologie generale,' vol. ii. 



t ? Name preoccupied, Labidophora, 1876, Scudder, Orthoptera 

 (Forfic.), in ' Proc. Boston Soc. Nat. Hist.,' vol. xviii, p. 297. 



