COLEOPTERA 189 



is most marked in the Pterostichides ; these two islands possessing 59 out of a total of 

 78 species. The island of Kauai is rich in Anchomenides and Bembidiides, but possesses 

 no Pterostichides. Oahu is the metropolis of the extensive genus Metromenus and has 

 17 of the 26 species thereof. Hawaii is poor in all the groups, least so in Pterostichides, 

 of which it has 13 species. 



If this table be studied with the map it seems to indicate that the movement of 

 species has been on the whole from North to South. This is best shown in the 

 Pterostichides and Bembidiides. From the metropolis — Maui and Molokai — of the 

 former group, 4 species are found northwards in Oahu, but none have reached Kauai ; 

 on the other hand 13 species are found southwards in poverty-stricken (so far as 

 Carabidae are concerned) Hawaii. Kauai is the metropolis of Bembidiides, and it 

 seems probable that as species of this group are found in all the islands to the south 

 (except Lanai), that most of them have been derived from Kauai. The Kauai species 

 of Anchomenides are as a rule remarkably distinct ; and it is not unreasonable to infer 

 that — notwithstanding its superior age as a theatre for entomological action — it has been 

 comparatively free from immigration from the other islands, though not infrequently 

 sending emigrants to them. 



Before passing to the enumeration of the species it is right to say that I think 

 this collection of Hawaiian Carabidae is far from being a complete one. No 

 Carabidae were known to live in the Hawaiian islands until about twenty-five years 

 ago. The Rev. T. Blackburn, during his residence in the islands, at that time discovered 

 and described no less than 60 species. The laborious exertion and great perseverance 

 of Mr Perkins have increased the number to 210. When I recall the fact that 

 large parts of the islands are entomologically still terrae incognitae, and also that 

 Mr Perkins collected, in the localities he visited, not only all the Orders of insects, 

 but likewise birds, molluscs, spiders, etc., I am warranted in saying that I think the 

 Hawaiian Carabidae may prove to include about twice the number of forms here 

 catalogued. The nature of the collection confirms this view, there being many forms 

 represented by only one, two, or three specimens. 



Hawaiian Carabidae are extremely subject to the attacks of Laboulbeniaceae, a form 

 of Cryptogam that flourishes on chitin. This is carried to such an extent that some of 

 the specimens are perfect gardens of these curious fungi. Some three or four years ago 

 Professor Roland Thaxter visited Europe for the purpose of his phytological work on 

 this group. On his attention being called to the collection of Hawaiian Carabidae 

 formed by the Sandwich Islands Committee, he examined it in detail, and took away 

 many specimens of the parasites. He has since published descriptions of some of them, 

 and as he left a ticket attached to each beetle from which he took specimens of the 

 parasites, I have added to my paper the numbers written on his tickets. The species of 

 in.sect on which the Laboulbeniaceous parasite lived can thus be identified, as Professor 

 Thaxter published these same figures in connection with his descriptions. 



