COLEOPTERA 657 



Proterhifius ruficornis Perk. 



P. ruficornis Perk., 1. c. 



Varies in size, length of pronotum and elytra, and in colour, but the antennae 

 appear to be always unicolorous. In P. adehis, which has the same habits as P. rufi- 

 cornis, the antennae vary in colour, sometimes they resemble those of the latter, but 

 sometimes the apical joints are dark. The species are easily separated by the differences 

 in the pronotum and the greater development of the antennae in P. ruficornis. 



Hab. Oahu ; mountains round Honolulu, 1500 ft. and upwards, in company with 

 P. adelus. 



Proterhinus deinops Perk. 



P. deinops Perk., huj. op. n., p. 201. 



The variation in this remarkable species is of the same nature as that exhibited 

 by many others of the genus. The rostrum of the female varies slightly in length 

 and form, the pronotum and elytra are much narrower and more elongate in some than 

 in others, and large examples are fully twice the bulk of small ones. Nevertheless it 

 remains always easy of recognition by the peculiarities of the head and eyes. 



Protcrhinns squamicollis Perk. 



P. squamicollis Perk., 1. c. 



A small series of examples were taken in the mountains near Honolulu and other 

 parts of the Koolau range. They agree well with the original specimens and the species 

 is quite distinct from any other. 



Hab. Oahu; widely distributed in the Koolau range, but apparently not abundant. 

 I have taken it on Bobca clatior, but do not know whether it is confined to this tree. 



Proterliimts adelus Perk. 



P. adelus Perk., huj. op. 11., p. 202. 



I have examined a fine series of this species. In its commonest form it is 

 remarkable for the very strong and abrupt constriction of the pronotum anteriorly, 

 and the very well-marked three-jointed antennal club. The eyes are large and promi- 

 nent, the basal abdominal segment coarsely punctate even on the disc. 



It varies in colour, clothing and size, in the relative length and width of the elytra 

 and of the pronotum, and in the length and colour of the antennae. In some examples 

 the constriction of the thorax is much less abrupt, and in extreme varieties almost or 

 quite wanting. 



The form with unicolorous red antennae and extremely abrupt constriction of the 

 thorax may be distinguished as var. adeloides. 



