242 FAUNA HAWAIIENSIS 



the antennae clear red, and the second joint more rounded. In those examples with 

 the longest and most slender antennae, the front tibiae are often much lengthened, and 

 the tarsal lobes appear to be very minute, and decidedly smaller than are those of 

 certain other forms. After the examination of a vast amount of material (consisting of 

 hundreds of examples) I have come to the conclusion that this species is at the present 

 time in the process of becoming differentiated into a number of distinct forms. Some 

 of these forms indeed may already be really distinct species, but to decide whether this 

 is the case would probably require very careful observations of the living insect in 

 various localities. 



Hab. Hawaii. Common on the mountains, especially at an elevation of about 

 4000 ft. The whole insect is often covered with a muddy substance. 



G. Species quae duas vel complures insulas incolunt. 



(115) Proterhinus innotabilis, sp. nov. 



Nigricans vel piceus, rare rufescens, elytrorum basi plerumque rufescente et pallide 

 squamosa. Oculi prominuli. Antennae graciliores, minus fortiter elongatae. Capitis 

 vertex a fronte linea transversa elevata (nonnunquam fracta) divisus. Pronotum minus 

 latum, subferrugineo-squamosum, fortiter et distincte 3-impressum. Elytra minus elon- 

 gata, fortiter crebre punctata, sutura saepe elevatula, basi plerumque rufescente, ibique 

 pallide squamosa, postice maculis duabus albidis squamosis utrinque suturam juxta 

 saepe notata, setis erectis albidis minus fortiter elongatis sparsim vestita, ad basim 

 utrinque scutellum juxta tuberculata {tuberculis saepe albido-squamosis), angulis ipsis 

 humeralibus fortiter acute productis. Z ?■ Long, (exemplorum in insula Maui capt.) 

 2 — 3 mm. 



So far as examples from Maui are concerned this is a small species, or at least only 

 of moderate size in very largely developed individuals. It is one of the most obscure 

 of the numerous species found on Haleakala, and is allied to P. epickrystts and P, brevi- 

 pennis, but cannot be referred to either. On Molokai I have taken specimens of a 

 Proterhinus exceeding like P. innotabilis but of larger average size, and which appa- 

 rently pass from this form into one, which becomes largely different to the typical 

 Haleakala form, and indeed in many respects approaches the Molokai species P. con- 

 vexiusciilits. These examples from Molokai are themselves a most puzzling series, and 

 may represent more than one species, but I have not cared to consider them at present 

 as more than varieties of P. innotabilis, especially as this species is itself not a little 

 variable. 



Hab. Maui, Haleakala (4000 — 5000 ft.), Molokai. Not rare, many examples 

 having been taken. The examples taken on Molokai are apparently referable to the 

 same species. 



