HISTORY OF LITERATURE. 13 



been supposed to be the great destroyer of dried 

 insects in collections. I have reason to doubt the 

 correctness of this view ; that it will eat them if it has 

 not any other suitable food is certain, but that it 

 practically does much damage I am not by any means 

 convinced of. I believe that a largish proportion of 

 the sins laid to its charge are committed by other 

 Acari or by insects. The joint paper contains con- 

 siderable information upon the external but not any 

 on the internal anatomy. It contains other interesting 

 observations on Tyroglyphus, and is well illustrated. 



H. A. Pagenstecher, in 1861, published a very short 

 paper * on the anatomy of what he called Tyroglyphus 

 siro ; it really is not T. siro, but is T. farinse, a very 

 different species, now considered to form a distinct 

 genus, Aleurobius. The paper will be dealt with in 

 the chapter of this book on anatomy. It does not 

 appear that Pagenstecher dissected the species (it was 

 before the date of sections of Acari) ; he seems to have 

 been satisfied with what he could see from the exterior 

 by clearing the creature ; consequently his internal 

 anatomy appears to include a good many errors, but it 

 is, as far as I know, all we have upon that of 



Dr. Gudden also, in 1861, wrote a paper t which, in 

 1863, he republished in an enlarged form. This 

 remarkable paper was issued in a Wiirzburg medical 

 journal, and its title did not indicate zoological studies ; 

 consequently it was missed by acarologists until a few 

 years ago. This paper will be found fully referred to 

 in the chapter on anatomy. Gudden wished to com- 

 mence his medical paper on Scabies by an account of 

 the external and internal anatomy of the Sarcoptes 



to the single species H. carpio, Kramer, and to create another genus, 

 Monieziella, for the remainder. I do not think that this is necessary. 



* " Einiges zur Anatomic von Tyroglyphus siro," in 'Z. wiss. Zool.,' 

 Bd. xi, pp. 12 14, pi. xiii. 



t " Beitrag zur Lehre von der Scabies," ' Wiirzburger medicinische 

 Zeitsch.,' 1861, p. 301; and ' Zweite veruiehrte Auflage,' Wurzburg, 

 1863. 



