COLEOPTERA 257 



forms with aeneous thorax mentioned in Blackburn's note (1. c). The latter at least in 

 part are no doubt referable to Cis cognatissinius or C. nesiotes, or to both of these 

 species. Usually C. bicolor may be distinguished at a glance from these species by its 

 general appearance. The prothorax is black, not aeneous, and is widely pale in front 

 and more or less so posteriorly. The elytra are testaceous with a black spot on each 

 about the middle, and in front of these is another spot placed transversely across 

 the suture. This transverse spot is absent in only a few e.xamples in a long series 

 and it is doubtful whether these are really specifically identical with the others. The 

 elytra in very fresh specimens bear some excessively short setae rather like those of 

 C. cognatissimus, but there is no trace of any long fine hairs at the sides or apex. The 

 species is of rather elegant form owing to its convexity, and the rather rounded sides of 

 the elytra. The chief variation is seen in the puncturation especially of the prothorax, 

 which in some examples except at the extreme base is excessively smooth and shining 

 and nearly impunctate, but we have taken examples distinctly punctured in company 

 with the very finely punctured individuals. The length varies from r5 — 2*5 mm. 



Hab. In the mountains of all the islands. The van in which the trans-sutural 

 black spot on the elytra is wanting has occurred on Kauai and Hawaii, and these 

 individuals are above the average in size. 



(7) Cis bimaailatus Sharp. 



Cis bimaculatus Sharp, Tr. Dublin Soc. 1885, p. 161. 



The largest Hawaiian species of the genus, but very variable in size, some examples, 

 both from Hawaii and Maui, being only about one-third the bulk of the larger indi- 

 viduals. These dwarf specimens are taken in company with those of normal size. 

 Otherwise this species exhibits little or no variation. There are no long hairs on the 

 elytra, but excessively short pale setae are present, at least in fresh examples. Length 

 2"2 — 3"2 mm. 



Hab. Maui, Haleakala.— Hawaii, at elevations of 3000—5000 ft. Not rare, 

 about 30 examples have been examined. 



(8) Cis nigrofasciatus Blackb. 



Cis nigrofasciatus Blackburn, Tr. Dublin Soc. 1885, p. 162. 



(Plate X. fig. 18.) 



Seven examples of this species were taken and they exhibit no noteworthy varia- 

 tion, except that some are considerably larger than others. The setae of the elytra 

 are excessively minute, and hardly visible even under a very strong lens. Length 

 2 — 2'7 mm. 



Hab. Lanai, 2000—3000 ft. Blackburn's unique example was taken on the 

 same island. 



