2 72 FAUNA HAWAIIENSIS 



(7) JMetrothorax blackburni, sp. nov. 



Angustulus, convexus, nitidus, niger, antennis extrorsum fuscescentibus, basi palpis 

 pedibusque flavis; prothorace elongate, profunde canaliculato, basi coiistricta punctataque, 

 angiilis posterioribus acute rectis ; elytris 5- vel 6-striatis, striis punctatis sed brevibus. 

 Long. 5 mm. 



This species is — like however to other allied forms — very Bembidioid in appearance. 

 It is not likely to be confounded with other species of this genus, but more resembles 

 certain species of ThriscotJiorax \ e.g. T. kai'schi; it has however a narrower thorax 

 with the constricted basal portion more elongate. The head is rather narrow ; the 

 antennae have the first three joints and the base of the fourth yellow, the others rather 

 darker. The thorax is but little broader than long, the sides gently rounded in front ; 

 sinuate behind, and meeting the base so as to form a sharply-marked right angle. The 

 median channel and the basal punctuation are very distinct, the lateral margin, as well 

 as that of the elytra, quite fine. The elytra transversely convex, rather narrow, shining 

 black, only narrowly yellow at the tip ; towards the base with well-marked series of 

 punctures — about five in number : these are continued backwards as fine striae, but only 

 the sutural one is definite at the tip. Legs clear yellow. I have named this distinct in 

 species after the Rev. T. Blackburn, who was almost the first to call attention to the 

 interesting nature of the Hawaiian Insect-fauna. The six examples found show little or 

 no variation. 



Hab. Molokai. On the mountains, in June, in 1893 ^'^'^ 1896 (Perkins). 



(8) Metrothorax scaritoides, Blackburn. 



Cyclothorax scaiHtoides Blackburn, Ent. Mo. Mag. xv. 187S, p. 156: Blackburn and 

 Sharp, Tr. Dublin Soc. (2) iii. pi. iv. f. 6. 



We have received a very large series of this species. It has a broad thorax, which 

 is moderately long, and has a very short basal constriction, just sufficient to make the 

 angles rectangular ; the length of the insect is about 5 mm. and that of the thorax i \ mm.' ; 

 the legs and antennae are yellow, the elytra convex, and with but feeble and not extensive 

 striation. The striation is rather variable, and some examples (as stated by Mr Black- 

 burn) have several short striae visible and in some cases these are series of punctures. 

 The species has been found on the two adjacent islands of Maui and Molokai, and there 

 is no difference between the specimens from the two islands. One highly aberrant 

 example from Molokai has the elytral sculpture almost as well developed as it is in 

 M. blackburni. but has none of the other characters of that species. 



Hab. Maui. Haleakala (Blackburn), 4000 — 5000 ft., on several occasions 

 (Perkins). 



' Mr Blackburn gives the length as 6 — 6i mm., but he seems to have exaggerated the length of most 

 of the species of this division. It is probably however rather greater in quite fresh than it is in dried 

 specimens. 



