478 M. A. Scheuten on some Mites and their young states. 



narrowed behind, and terminated by two strong bristles, with 

 two short ones between them. On each side there are one strong 

 and two weaker bristles. The tarsal claw is somewhat curved, 

 with a tridentate structure beneath it, and above it a strong 

 bristle (PL XIV. fig. 10). 



The mite (fig. 9) is short and obtusely pyriform ; 0*40 mill, 

 long, 0-22 broad in front, and Oil behind. The sides are un- 

 dulated between the second and third pairs of legs. The legs 

 are seven-jointed, and the two intermediate pairs somewhat 

 shorter than the others. The tarsal joints have two thin, straight 

 claws and a small sucking-disk. The palpi are indistinctly 

 jointed, with the last joint almost always bent inwards, so that 

 it can rarely be seen; they are half-amalgamated with the 

 rostrum, from which the author once saw the sucking-tube pro- 

 truded. The body is terminated by six short bristles, and on 

 each of the prominences of the undulated sides is a simple 

 bristle. The eyes are wanting. The colour is brownish-white, 

 and quite opake. 



The author also describes another mite which he met with 

 only four times upon the leaves of the pear-tree. It occurred in 

 three different stages of development. The smallest was 0*24 

 mill, long and 0"18 mill, broad ; the second, 0*32 and 0*24 mill. ; 

 and the largest, 0'48 and 0'34 mill. The body of the mature 

 animal (fig. 12) is oval; the rostrum conical, with the three- 

 jointed acute palpi half-amalgamated with it. The seven-jointed 

 legs are terminated by two claws and a globular sucker beset 

 with bristles. The body is green, with black points, and with a 

 broad white band down the middle, in the fore part of which is 

 a large, triangular, red spot. On each side, above the second 

 pair of feet, is a large, red, eye-like spot, and behind this a white 

 oval one. The body is also regularly set with small white points 

 or papillae. 



The body of the young animal (fig. 11) is not oval, but rhom- 

 boid, with the angles rounded; the colours and markings are 

 essentially the same. The diffused red eye-spots are here circular, 

 and project like eyes. Instead of the white points of the mature 

 form, triangular papillaj are attached in this by their apices. 

 Of these there are six close together at the posterior extremity, 

 two on each side between the second and third pairs of feet, one 

 on each palpus, two on the apex of the rostrum, and several 

 symmetrically arranged on the body, giving the animal a curious 

 aspect. 



For the first- described mite of the pear-tree, which belongs 

 to the family of the Gamaseij and which appears to be unde- 

 scribed, the author proposes to form a new genus under the 

 name of TyphlodromuSy in allusion to the blindness of the ani- 



