340 



ARACHNOIDEA. 



CASE 

 XVI. 



in them. We have never seen them in the mite of the hme-leaf 

 nail-gall, because we have never been lucky enough to detect 

 mites there at all ; but, in other Phytopti, they are easily enough 

 seen, and the impression left on our mind is in favour of their 

 being eggs. It is not so with all observers, however, and notably 

 it is opposed to the views of the author, M. A. Scheuten, who 

 makes the next important contribution to the history of the 

 Phytopti, and which if correct should settle the question of their 

 true nature and affinity. 



M. Scheuten's account of his observations was published in 



Phytoptus pyii. 



(Typhlodroiuus pyri of Scheuten.) 



Copied from his figure. 



Gamasus sp. Copied from Sch<'Uten, 

 who supposed it to be the perlect 

 insect oi I'yphlod.-onjus pyii. 



Wiegman's "Archiv" for 1857, and translated into our own 

 Annals and Magazine of Natural History in the same year. The 

 leaves of the pear trees in his garden were attacked by black 

 pustular inflated spots, under the epidermis of which he found 

 the species of Phytoptus, which he named Typhlodromus pyri. 

 On examining a large number of spotted leaves in his garden, 

 in which all the pear trees were similarly attacked (one tree 

 having a third of its leaves affected), he always found the same 

 four-footed larvse in the interior of the leaves, and, in most cases, 

 on the exterior a species of eight-legged mite, which he took to be 

 the perfect form of the Phytoptus. He gives figures of these, 

 and from them it is plain that the so-called larva is a Phytoptus, 



