DESCRIPTIONS OF GENERA AND SPECIES. 283 



GLYCYPHAGUS SCIUBINUS,* Haller. Pis. XVIII, XIX. 



Dermacarus sciurinus, 1880. Haller, " Zur Kenntniss der Tyro- 



glyphen und Verwandten," ' Z. \viss. 



Zool.,' Bd. xxxiv, pp. 268273, pi. ix, 



figs. 416. 



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



Homopus scitirinus, 1888. Can., ' 1 Tiro.,' p. 18 ; ' Pros.,' p. 377. 



Labidophorus sciurinus, 1898. Ondemans, ' List,' p. 252. 



Glycyphagus sciurinus, 1897. Beiiese, ' A. M. S. Crypt.,' p. 106. 



Hypopial Nymph. 



Dermalcichus sciurinus, 1841. Koch, D. C., fasc. 33, No. 7. 



,, 1879. Caneslriiii, " Intorno ad alcuni 



Acari parassiti," in ' Atti Soc. Veneto- 

 Trent,' vol. vi, fasc. 1, p. 13. 



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

 xiii, fig. 69. 



It will be seen from the above synonymy that the 

 hypopial nymph of this species was first discovered by 

 C. L. Koch, who took it for an adult creature. He at 

 first placed it in the genus Dermaleichus, but subse- 

 quently created a new genus for it which he called 

 Homopus. The adult was discovered by Haller, who 

 founded his genus Dermacarus upon it. Haller fully 

 recognised that Koch's Homopus sciurinus was an im- 

 mature stage of his adult, but, oddly enough, he con- 

 sidered it to be the larva ; his reason apparently being 

 that he could not find any other larva, but this is a very 

 insufficient reason. Of course, what was a liypopus, and 

 what the position of that stage was, was not as well 

 understood when Haller published his article as it is 

 to-day. Haller had expressed an opinion that Homopus 

 was immature some time before he found the adult. t 



Haller 's description and drawings are long and 

 careful ; still he missed a good many points, and some 

 that he described and drew were not absolutely correct ; 

 he apparently missed the pectination of the body-hairs ; 

 moreover the form of caroncle which he gives is only 



* Sciurus, a squirrel. 



t " Revision der Gattung Analyes, sive Dermaleichus, Koch," 1877, 

 ' Z. wiss. Zool.,' Bd. xxx, pp. 78, 79. 



