•7 



76 FAUNA HAWAIIENSIS 



to that discovered by Mr Perkins on Kauai. It was nearly all brought to light by 



Wollaston, who found it concealed in the decaying wood and stems of the precinctive 



vegetation. The St Helena species exhibit a remarkable variety of forms. Some of 



our species show" a condition parallel with the St Helena forms, in sculpture, in form, 



and in the reduction of the eyes and atrophy of the wings. Some of Wollaston's 



species of Endosoniatiiiiu would not look out of place intercalated in the Hawaiian 



series. If the two faunas can be more completely ransacked for Bembidiids I shall not 



be surprised if this parallelism is found to be more extensive. Some of the St Helena 



Bembidiids are very different from the Hawaiian forms and it is clear that the two 



faunas have had totally different origins. 



The Hawaiian genera are easily distinguished. 



Trophi elongate (Plate VII. tig. 24), 



Wings vestigial Gnatholymiiaeum. 



Wings ample Nesolymnaiutn. 



Trophi normal in length, 



Thorax with two pairs of setae. 



Wings fully developed Baiihidiuni. 



Wings atrophied, 



Eyes well developed Nesocidiuin. 



Eyes reduced or absent Nesomicrops and Maci-aniHits. 



Thorax with one pair of setae or none, 



With one pair placed at the hind angles Atelidiuni. 



With no setae Mctrocidiuin. 



Tachys is not included in this table. The species have a deficient complement of 

 striae, one of which is peculiarly recurved behind ; and the front tibiae are not straight 

 externally. 



Gnatholvmn.\eum, gen. nov. 



Trophi elongati ; mandibulae et maxillae pertenues. Maxillarum lobus externus 

 valde elongatus, integer, ad basin vix divisus. Oculi parvi. Elytra sulcata. Corpus 

 apterum. 



This very abnormal form of Bembidiid is remarkable for the sharp and slender long 

 mandibles (Plate VII. fig. 25) which have very little power of movement. The division 

 of the external lobe of the maxilla is rather incomplete, and is indicated only by a very 

 oblique suture near the base. The insect has the facies of Trcchits quite as much as it 

 has of Bciiibidium, but it is completely connected with the latter genus by means of 

 Nesolymnaauu, which looks quite like a Hat Bembidiuni. The genus should be placed 

 at the beginning of the Bembidiides, near Lymnaeum. 



(i) Gnatholyinnaeuin blackburiii, sp. nov. 



Rulo-piceus, elytrorum plaga posteriore palpis pedibusque testaceis, antennis rufo- 

 obscuris, basi dilutiore ; elytris sulcatis. Long. 4^ mm. 

 Plate YII. figs. 18 & 25. 



