2 14 FAUNA HAWAIIENSIS 



The sculpture of the tarsi is not so strongly marked in most of the species of this 

 genus as it is in Mesotliriscus and Atelothrus, but it is present always in the form of 

 a longitudinal groove on the outer side of the first and second joints, and may also be 

 detected on the interior side of these joints as a flattening or compression of the surface, 

 but there is no trace of a raised line along the middle. In the Kauai species, however, 

 the grooves are very distinct and the tarsi flattened so that both grooves are visible on 

 the upper face of the tarsus. Hence there are two well-marked groups in Colpocacc7ts. 

 The structure of the feet thoroughly distinguishes the genus from Colpodiscus, in which 

 I formerly very reluctantly located C. tantalus. 



(i) Colpocaccus tantalus, Blackburn. 



Dyscolus tantalus Blackburn, Ent. Mo. Mag. .\iv. 1877, p. 147. 

 Colpodiscits tantalus Sharp, op. cit. xx. 1884, p. 217. 



Readily distinguished from the other species by the deep black colour, even the 

 inflexed margin of the elytra being deeply pigmented. The middle of each femur is 

 always more or less infuscate. The thorax is somewhat narrower and longer than it is 

 in the other species and is u.sually darker in colour, but this varies a little. A very fine 

 series of between three and four hundred specimens has been secured by Mr Perkins. 

 Though apparently the most common of the Carabidae of Oahu, it varies but little. 



H.AB. Oahu, Blackburn, Perkins. Found in several localities, both in the Waianae 

 and Kaala ranges : very abundant at Halemano in December and January. 



(2) Colpocaccus liaivaiiensis, sp. nov. 



Piceus, nitidus, subtus testaceo-variegatus, antennis, palpispedibusque flavis, his plus 

 minusve infuscatis, elytrorum margine elevata ferruginea ; thorace transverse, angulis 

 posterioribus perparum argutis ; elytris leviter striatis. Long. corp. 8 — 9 mm. 



In this species the inflexed margin of the elytra is always bright yellow, and the 

 raised margin shews red or yellow on the upper surface. The femora are always 

 somewhat infuscate, and the thorax has the hind angles a little less marked than the 

 other species. 



Mr Perkins has secured a series of about 200 specimens of this species. It varies 

 somewhat more than C. tantalus does, but there is no doubt about even a single specimen, 

 slisfht as are the characters. 



Hak. Hawaii (Perkins) : Kona and Kilauea from June to September. 



