304 MODERN SYSTEM. 



five articulations, the first three gi-adually shorter, tlie fourth longer 

 and wider, the fifth shorter, and receiving the didactyle claw: abdi)- 

 men in both sexes with eight joints: Female? with the first seg- 

 ment of the back produced, the fourth and remainder partly con- 

 cealed, the last segment at its apex furnished with a setigerous 

 style: Male? with the last segment largest. 



Its situation was referred to the Diptcru by Latreillc, who ob- 

 serves, in a note, that it may probably be found hereafter to consti- 

 tute a peculiar Order of insects. From the apparent want of an- 

 tenna^, and from the conilucnce of the head and thorax, Ur. Leach 

 placed it amongst the Arac/nid/ila, in a division by itself. Its mode 

 of propagation is unknown. Hermann considered the sexual as spe- 

 cific difi'erences. 



Sp. 1. Ni/cf. Hcrmanni. 



riirhiridium biarticulatum. Herin. Man. Apt. 124./)/. 6.fi}l. 1. Olfers,S0. 

 lllppobosca Vespertilionis. Schr. Fn. Brit. 2587. Phthiridiuni Hcr- 

 manni. Iauc/i, Encycl. Brit. Siipp. vol. i. 1 Id. pi. 23. — Zoul. Misc. iii. 

 55, pt. Ml. 



In the plate given in the third volume of the Miscellany, repre- 

 sentations are given of the sexes very nuich magnified, with one leg 

 still more highly increased by the aid of the microscope. The se- 

 cond joint of each tibia is longer than all the joints of the tarsus 

 taken together. 



Inhabits the greater and lesser horse-shoe bat. 



