Genera of the Cossonidcp. 527 



agrees in its total freedom from even the rudiments of 

 eyes) that I had at first sight supposed it to be a member 

 of that actual genus ; nevertheless its 5-jointed funiculus, 

 parallel outline and obsolete scutellum, in conjunction with 

 its less completely approximated four anterior legs and 

 the structure of its abdominal segments and tibias, show it 

 to belong unmistakeably to that particular section of the 

 Pentarthrides which contains Pentatemnus. In point of 

 fact it is very intimately allied to the latter genus, from 

 which it nevertheless recedes in its eyes being altogether 

 absent, in its tibiae being armed at their inner angle (as in 

 Lipommata) with a distinct spinule, and in the two hinder 

 ones having their apical hook reduced in size and almost 

 spiniform, in its four anterior tarsi being more narrow and 

 linear, whilst the hinder pair are comparatively robust, and 

 in its claws being so exceedingly minute as to be barely 

 traceable even beneath the microscope. In its general 

 outline and sculpture, as well as in its rather pallid hue, it 

 is exactly intermediate between Pentatemnus and Ony- 

 cholips,si fact which is equally borne-out by its nearly 

 rudimentary ungues, and the somewhat spiniform struc- 

 ture of its hinder tibial unci. 



In its prothorax being appreciably narrower than the 

 elytra, as well as in its inner tibial angle being produced 

 into a very evident, robust spinule, and in its eyes being 

 totally absent, Haloryhnchus embodies some of the most 

 characteristic features, likewise, of Lipommata (in the true 

 Cossonides}, thus bearing still further testimony to that 

 strange and mysterious resemblance which seems, as it 

 were, to bind together the whole of these immediate pilose, 

 posteriorly-asperated, fossorial, sand-infesting forms, in the 

 three subfamilies Pentarthrides, Onycholipides, and Cos- 

 sonides. 



31. GEORRHYNCHUS (Eoelofs, Ann. Soc. Belg. x. 241. 

 1866 ; and xi. 78. 1867). I am indebted to M. Eoelofs, 

 of Brussels, for the opportunity of examining his unique 

 type of the very curious insect (captured near Montevideo, 

 in South America) for the reception of which he established 

 the present genus ; and although I will not venture to re- 

 cord more than a desultory opinion concerning its affinities, 

 which Lacordaire (vide Gen. vii. 348, note) and others 

 have justly regarded as very obscure ; yet, after a careful 

 examination of its several parts, I cannot but think that it 



