256 ARACHNOIDEA. 



CASE notice ; but although we adopt his section and his name, we do 

 not adopt his character, nor confine it to his species, and, there- 

 fore, cannot quote it as his genus. 



The chief characters, as defined by Claparede, were that the 

 two right and left abdominal suckers are present both in the 

 male and female, instead of being so only in the male, as in 

 the normal Tyroglyphi, and that the third pair of legs are dis- 

 proportionately large. Both of these characters seem to us 

 merely specific. We have seen, when speaking of Hypopus, that 

 the number and distribution of abdominal suckers vary in every 

 species, and an abnormal thickening of legs in one sex is a not 

 uncommon variation in species of many genera of insects. But 

 Messrs. Fumouse and Robin, in describing this Tyroglyphus (T. 

 echinopus), pointed out that it had no sucker annexed to the 

 tarsi. They did not propose to make a new genus for the 

 species on that account, but proposed to alter the character of 

 the genus Tyroglyphus to admit their species. Hitherto the 

 character ascribed to the tarsi had been a claw with a sucker. 

 Now the T. echinopus of Fumouse and Robin has no sucker, 



Tarsus of Rhizoglyphus. Tyarsus of Tyroglyplius 



neither has Claparede's Rhizoglyphus robini (his Hypopus 

 dujardimi is the same as T. echinopus) ; both with similar habits, 

 viz., feeding on hyacinths, and, what is more, having the com- 

 mon character of living on vegetable substances ; whilst the 

 others (the Tyroglyphi) aifect animal remains, cheese, dead 

 insects, &c. For the former we suggest that Claparede's name 



