Notes on Tyroglijiohidse. By A. B. Michael. 31 



parallel-sided for the greater part of its length. There are not any 

 markings^ but there are two hairs on the hind margin ; and the two 

 dark-coloured vesicles^ usually supposed to be excretory organs 

 and found in so many Acarina, show through from the trans- 

 parency of the chitin. The sucker-plate on the ventral surface, 

 immediately behind the anus, carries, near to its anterior edge, a 

 pair of large suckers which almost touch in the median line ; further 

 back is another pair of rather larger suckers further apart, and 

 still nearer the hind margin of the plate is a row of four very 

 minute suckers. 



Larva. 



This resembles the ordinary nymph in all respects except its 

 smaller size and the possession of only three pairs of legs instead of 

 four. 



The Egg 



Is white and polished, without markings, rather larger at one 

 end than the other, and rather more than twice as long as it is 

 wide. 



Hypopus of Ehizoglyphus Eobini. 



Average length about ■ 33 mm. 

 „ breadth „ -19 „ 



A short, somewhat rounded Htjjoojms. 



Colour moderately dark brown, sometimes very light brown, 

 becoming darker in places, particularly near the edges. 



Texture highly polished, semi-transparent. 



Cephalothorax without markings, considerably overhung by 

 the anterior margin of the abdomen. Eostrum not reaching the 

 anterior edge of the dorsal carapace, but both it and the two 

 anterior pairs of legs are seen through the carapace from its 

 transparency. Second pair of epimera joined to the sternum. 



Legs short and stout, diminishing rapidly in thickness, even 

 the two front pairs not projecting far beyond the carapace, the two 

 hind pairs scarcely project at all. The tibiae of the front pair 

 have longish tactile hairs, and all the tarsi have numerous hairs, 

 but there are not any of conspicuous length. All the legs are 

 terminated by a single claw without sucker or caruncle. 



Abdomen much arched, rounded at the sides, anterior margin 

 curved, posterior almost a semicircle. There are not any 

 markings, but there are two straight hairs on the posterior margin. 

 The arrangement of the suckers is as follows. There is one 

 sucker on each side of the posterior end of the anal opening ; these 



