I90 FAUNA HAWAIIENSIS 



§ 2. Systematic account of the Coleoptera Caraboidea. 



The Caraboidea, or Adephaga, as they are often called, are easily recognised by the 

 five-jointed tarsi, the rather long, slender antennae not thickened at the tip ; by the 

 highly developed mouth-parts, mandibles large, outer lobe of maxilla divided, and by 

 the structure of the under-surface of the abdomen, which has five segments visible along 

 the middle and six at each side. 



In Hawaii there are two families. 



1. Carabidae ; terrestrial beetles, with all the legs formed for running, and the 

 antennae delicately pubescent and setose. 



2. Dytiscidae ; water-beetles, with the hind legs transformed to swimming organs, 

 the antennae quite bare. 



Fam. CARABIDAE. 



Subfam. HARPALINI. 



Two setae on the inner margin of the orbit, one of them just behind the eye, but 

 varying as to proximity according to the size of the eye. The four groups may be dis- 

 tinguished as follows : 



Elytra cut off in nearly a straight line behind ; claws (in the two Hawaiian genera) 



serrate beneath Lebiides. 



Elytra not cut off behind ; the tips are either coadapted with the body behind 

 (Pterostichides, Bembidiides), or more or less flat and sinuate (Anchomenides). 

 Claws simple. 

 Last joint of palpus minute, appearing as a small appendage of the penultimate 



joint, PI. VII. fig. 25 Bembidiides. 



Last joint of palpi large. 



Side margin of elytra near the tip distorted, PI. VI. fig. 12 Pterostichides. 



Side margin of elytra simple Anckometiides. 



The Bembidiides and Pterostichides are nearly all smaller than the Anchomenides. 



Group ANCHOMENIDES. 



Division i. Hind tarsi not sculptured. 

 (For Div. 2 vide p. 213.) 



This includes seventeen genera. The tarsi are always evenly convex above, without 

 any grooves or impressions. 



[It should be noticed that in some members of Division 2 the tarsi are only very 

 obscurely grooved.] 



The following key will facilitate the determination of these forms. 



Wingless forms, with remarkable sculpture, so that the large pits on the eighth stria near the extremity 

 can scarcely be detected. Blackbuniia, Deropristus, Atrachyaianis, Anchoteffliis. 



