324 FAUNA HAWAIIENSIS 



Of the Diplopoda, Polyxenus is a genus that is represented in various parts of the 

 world ; Aporodesminus is new to science, and its relationship is not clear because the 

 members of the family Cryptodesmidae and its allies are very little known. The most 

 interesting genus of the Hawaiian Islands \f< Diinerogoniis, represented by 12 species. 

 Of this genus there are at present known only 4 species, from Australia and New 

 Zealand, and one from Chile'. Therefore the discovery of several species of Dimero- 

 gomis in the Hawaiian Islands is very interesting, as corroborating the opinion of an 

 Australian origin for the Hawaiian fauna. Moreover, the presence of species of the 

 same genus in New Zealand and Chile corroborates the theory of the existence, in 

 preceding epochs, of an antarctic region between these countries. 



It is worthy of note that each of the Hawaiian species of Dimerogonits presents 

 secondary sexual characters in the male : such as the great development of the collum 

 and the inferior protuberances of some of the joints in the legs of pairs 4-7 ; sexual 

 characters unknown in the Dimerogomis of New Zealand and Chile. 



Chilopoda. 



LITHOBIOMORPHA. 



Fam. LITHOBIIDAE. 



LiTHOBius Leach. 



(i) Lithobms hazvaiiensis, sp. nov. 



Ochroleucus. Caput. Lamina cephalica parum latior quam longior. Oculi ocellis 

 17 in seriebus 5 longitudinalibus dispositis (2, 4, 5, 4, 2). Antennae 29-articulatae sat 

 dense et breviter setosae, articulis 3 — 16 longioribus quam latioribus 17 — 28 inter sese 

 inaequalibus, articulo ultimo quam penultimus duplo longiore. Truncus. Laminae 

 dorsales subnudae, iv, vi, ix, xi, xiii, xv angulis posticis rotundatis, margine postico 

 parum sinuato, v, vii, viii, x, xii, xiv angulis posticis subrectis, xvi margine postico vix 

 sinuato, angulis posticis rotundatis. Laminae ventrales sparsim et brevissime setosae, 

 XVI angulis posticis parum rotundatis. 



Pedum maxillarium subcoxae dentibus 2 + 2 sat parvis armatae. Pedes ambulatorii 

 sparsim setosi, paris primi calcaribus ^g^f|, paris ultimi ^^fj subcoxae lateribus calcare 

 armatis, ungue unguicola laterali aucto. 



Pori subcoxales 5, 6, 5, 5, rotundi, uniseriati, sat parvi. 



Genitalium femineorum unguis brevis, trilobus, calcarium 3 + 2. 



Long. Corp. 20, lat. 2, 5 ; long, antenn. 7, long. ped. paris ultimi S, 5. 



H.\B, Kauai, Makaveli, 3000 feet, 1897 (Perkins). 



Dimero<^onus cfii/ensis Silv. -^ lulomorpha chilensis Silv. (i. 1903) = Nannolene nigrescens Attems 

 (111. 1903). 



