322 ARACHNOIDEA. 



^icv^ of his figure as follows : He calls the large curved claspers the 

 superior maxillae, (his nomenclature is more anatomical than en- 

 tomological) by which he no doubt means the mandibles (a term 

 he does not use) and the small hooks in the middle front of all the 

 inferior maxillae. We regard the latter as the. mandibles and the 

 former as metamorphosed maxillae; and it is to be said in support of 

 this view, that in the genus Listrophorus which also has a part of 

 the mouth metamorphosed into a clasper that part is the maxillae 

 too. The central shred of membrane in front of these small 

 hooks he calls the lingua (ligula), we should call it part of the 

 camerostome ; as to what we regard as the palpi on each side, he 

 simply styles them two short conical chelicerse supporting a long 

 bifid claw. The species described by Dr. Maddox sticks on to 

 the ear of the bat so .firmly that they had to-be detached by force, 

 and they appear to fix themselves by the mouth or head sticking 

 to one spot, and by their presence causing a considerable amount 

 of mischief and inducing much congestion and thickening of the 

 tissue beneath. Dr. Maddox figures the swollen spaces around 

 their point of adhesion. All the specimens that he saw were six- 

 footed, and he argued ftom so many as fifty being present that 

 they surely could not all be immature. Kolenati's specimens 

 were also six-footed, but he nevertheless regards them as mature, 

 and speaks of a blank being left between the second and fourth 

 pair of legs for the appearance of the absent pair which he 

 assumes to be the third. In this he is misled by assuming that 

 they belong to the Dermanyssi ; the system observed in all the 

 other known instances of the later appearance of an absent pair 

 of legs, is opposed to their being the third. These are invariably 

 the fourth pair and take their place behind all the rest, and the 

 blank of which he speaks after the second pair is merely a 

 character common to all the Sarcoptidae, although not to the 

 Dermanyssi. We do not exactly gather whether Kolenati ever 

 saw any with four pairs of legs. He says something that would 

 seem to infer at least that such have been met with : " hitherto all 



