248 FAUNA HAWAIIENSIS 



and it may be that, as I have suggested may be the case with AI. robiishis and 

 T. robustus, they are dimorphic forms of one species. It seems probable that, however 

 this may be, the two rarely occur together. The following are the particulars about our 

 small series of 13 specimens. Haleakala, 5000ft., i April 1894 No. 371; two specimens, 

 one of these is a most remarkable aberration, the seta on the left side coming not from 

 the hind angle but from a little distance in front of the normal situation, the specimen is 

 small, very narrow, with strongly cordate thorax : Haleakala, Maui, 4500 — 6000 ft., 

 March 1894 No. 383 ; one specimen, highly aberrant and possibly a distinct species, 

 being large, convex, with elongate convex thorax and more distinct striae : Haleakala, 

 4000 ft., May 1896 No. 597 ; one specimen : Haleakala, 5000 ft., October 1896 No. 661; 

 seven specimens: Haleakala, 4000ft., October 1896 No. 680; one specimen: Lahaina, 

 W. Maui, December 1896 (Koebele) ; one specimen, abnormal, the thorax formed as in 

 T. laetus though the setae are perfectly developed. For particulars as to Thriscothorax 

 laetus see that species. 



Hab. Maui. Haleakala and Lahaina, as above (Perkins). 



(11) Mecyclothorax koiiaiiiis, sp. nov, 



Rufo-piceus, elytris subaenescentibus, antennis rufis, basi, palpis pedibusque tes- 

 taceis ; prothorace transverso, haud cordato, angulis posterioribus minutissime prominulis ; 

 elytris profunde striatis, striis septima et octava subobsoletis. Long. 4^ mm. 



Closely allied to iM. cyiiiindicii-s, but with the thorax not all sinuate at the sides 

 behind, the posterior angles being only made prominent and rectangular by a very 

 minute projection of the angle itself The elytra are much less perfectly sculptured, 

 the striation being less deep, and the outer striae indistinct. The thorax is much 

 narrowed behind, so that the width at the base is less than that at the front angles. 

 Two specimens. 



H.\B. Hawaii. Kilauea, August 1895 (Perkins). 



(12) Mecyclothorax cyniindicus, sp. nov. 



Rufescens, supra subaeneus, antennarum basi, palpis pedibusque testaceis ; pro- 

 thorace transversim subcordato, angulis posterioribus rectis ; elytris regulariter per- 

 profunde striatis, striis punctatis. Long. 4^ mm. 



A distinct species ; rather flat ; distinguished by the rufescent colour, which 

 becomes rather strongly brassy above and by the remarkably regular and deep striation. 

 The antennae are rather short and stout. The thorax is moderately rounded at the 

 sides and narrowed behind, and just before the hind angles is sinuate, so that the angles 

 are rectangular, though there is no real constriction ; the base has a few punctures and 

 is depressed on each side, the median channel and the anterior impression are deep, the 



