262 FAUNA HAWAIIENSIS 



A very distinct species of which only one example has been found. In form like 

 Metrothoi^ax — e.g. M. debilis or siniiolns — but the lateral thoracic seta is present, though 

 excessively delicate. Thora.x very shining, much narrower than the elytra, con\'ex, very 

 shining, lateral margin very fine, the median channel and anterior impression subobso- 

 lete, the former however deepening into a fovea behind the middle, the sides gently 

 rounded, and the angles rectangular, though the sinuation that prevents them from being 

 obtuse is excessively short. Elytra broad, short and convex, very shining, black, very 

 broadly yellow behind, very finely striate, but with very definite punctures on the short 

 striae, the sutural stria reaching to the tip as usual. Legs short. One specimen. 



The glassy surface and the sculpture make this approach T. variipes and ducalis, 

 but it differs entirely from them in other respects. The extremely minute thoracic seta 

 and the Met rothorax-\\ks: form, together with the large area of yellow at the tip of the 

 elytra, should make it easily recognisable. 



Hab. Maui. Haleakala 3000 ft., in 1900 (Perkins). 



{13) Thriscotlwrax laetus, Blackburn. 



Cyclothorax laetns Blackburn, Ent. Mo. Mag. xvii. 1880, p. 228. 



This species greatly resembles MccyclotJiorax rtisiicus, but has a distinctly constricted 

 base to the thorax, and only very fine elytral striae. I have suggested that it may 

 possibly be a dimorphic form of Mccyclothorax laetus. The following are the particulars 

 as to our small series of 19 specimens: Haleakala April 1894, Olinda woods 4000 ft. 

 and downwards, two specimens ; Haleakala, 4000 ft. May 1896, two specimens. No. 599; 

 as preceding, but 5000 ft., one specimen. No. 600 ; as preceding, but No. 605, one 

 specimen ; as preceding, but No. 608, one specimen ; as preceding, but No. 609, one 

 specimen; as preceding, but No. 615, one specimen; as preceding, but 4000 ft. and 

 No. 622, two specimens; as preceding, but No 623, one specimen ; Haleakala 4500 — 

 5000 ft. October 1896, four specimens. No. 679 ; as preceding, but 4000 ft. and 

 No. 680, three specimens; Haleakala, in 1902, seven specimens given to Mr Perkins by 

 a friend. 



These data render it probable that if T. laetus and M. laetus are dimorphic forms, 

 yet they rarely, if ever, occur in company. For the data as to M. laetus see that 

 species, p. 248. 



Hab. Maui. Haleakala, about 4000 ft. on several occasions (Perkins, Nos. 599, 

 608, 609, 623, 679, 680). 



(14) Tliriscothorax bembidioides, Blackburn. 



Cyclothorax bend>idioides Blackburn, Ent. Mo. Mag. xvi. 1879, p. 107. 

 A remarkable little insect with highly polished, glassy surface. Thorax much 

 narrowed behind, with very obtuse angles. 



