14 BRITISH TYKOGLYPHIB^E. 



which causes it, but before attacking such a very 

 minute creature he thought he had better practise on 

 something rather larger. He selected Tyroglyphus siro, 

 and considering the means at his disposal, and the 

 process he employed, his success is simply marvellous, 

 his descriptions and drawings are admirable and ex- 

 tremely correct, and reflect the highest credit upon 

 their author. A good portion of the anatomy con- 

 sisted of entirely new discoveries, which others, myself 

 included, have subsequently rediscovered, as we 

 imagined, for the first time, having missed Gludden's 

 paper. It is only the anatomy that affects the Tyro- 

 glyphidae. 



A. Fumouze and C. Robin, in 1867 and 1868, 

 issued a series of papers * upon, inter alia, the genera 

 Glycyphagiis and Tyroglyphus^ including what is now 

 considered a separate genus, Rliizocjly pirns. These 

 papers probably have not ever been equalled by any 

 writings on any group of the Acarina, either for the 

 detail and accuracy of the description of external 

 characters, or the beauty of the illustrations by 

 Lackerbaiier which accompany them. They are con- 

 stantly referred to in the systematic portion of this 

 book. They contain much valuable information on 

 points beyond mere descriptions, but not any internal 

 anatomy. 



C. Robin alone in the same year, 1868, pub- 

 lished a paper t of the same character upon a new 

 species of special interest, considered by the author to 

 be a Glycyphagus, but now the type of the genus 

 Hericia, and up to the publication of this book the sole 

 representative of this genus. 



E. Claparede, also in 1868, published his well- 



* " Memoire anatomique et Zoologique sur les Acariens des genres 

 Cheyletus Glyciphagus et Tyroglyphus," in 'J. Anat. Physiol.,' 1867, 

 pp. 568599; 1868, pp. 66-92. and p. 287. 



f * Recherches sur une espece nouvelle de sarcoptides du genre 

 Glyciphage," 'Journ. Anat. Physiol.,' 1868, An. v, pp. 603625, 

 pis. 2224. 



