266 FAUNA HAWAIIENSIS 



(21) Thriscothorax ducalis, sp. nov. 



Robustus, nigerrimus, politus, antennis palpis pedibusque fusco-testaceis, his varie- 

 gatis ; thorace basin versus angustato, lateribus sinuatis, basi constricta, angulis posterio- 

 ribus rectis ; elytris seriebus quinque punctorum valde abbreviatis, stria suturali ad 

 apicem profunda. Long. 6^ mm. 



Plate VII. fig. 14. 



Resembles 7". variipes in sculpture, but is readily distinguished by the shape of the 

 thorax with rectangular hind angles. Antennae dark except the basal joint. Thorax 

 with the anterior impression indefinite, the median channel distinct. The series of 

 punctures on the elytra very much as in T. variipes, but with five or six punctures 

 outside the fourth stria, representing the fifth stria near the base. Legs largely infus- 

 cate, femora yellow just before the tips, the knee itself being dark. Five specimens. 



Hab. Maui. Haleakala, about 5000 ft., single specimens on several occasions 



(Perkins). 



(22) ThriscothoTux karschi, Blackburn. 



Cyclothorax karscki V>\a.c'khu'cr\, Ent. Mo. Mag. xix. 1882, p. 62. 



Distinguished amongst its allies by the deep striae and their comparatively large 

 punctures. There are five of these striae on each elytron, but only the sutural one 

 extends to the tip. The thorax is not greatly narrowed behind, and is only minutely 

 sinuate in outline before the hind angle ; the latter is obtuse, and the thick lateral 

 margin is strongly elevated there : the fovea on each side is deep. 



One of the rarest of the Hawaiian Carabidae, only three individuals being known. 



Hai;. Hawaii. Mauna Loa, amongst loose stones, 6000 ft. (Blackburn) ; Kona, 

 Mauna Loa, 4000 ft., in July and December. (Perkins). 



(23) Thriscothoi'ax obsciiricolor, Blackburn. 



Cyclothorax obsairicolor Blackburn, Ent. Mo. Mag. xv. 1878, p. 123. 



A rather small form, with the full complement of striae on the elytra ; though 

 rather deep they are not punctate. The general colour is dull black, with the margins 

 of the thorax and elytra more or less red, the basal part of antennae and the legs 

 yellow, the base of the femora blackened. I have seen only a small series and 

 it appears to be very variable : the striae are more or less deep, and when very deep 

 are indistinctly punctate, the colour also varies somewhat, as does the length of the 

 thorax ; this part is however always transverse, and a good deal narrowed behind, 

 with rather narrow base ; but there is no constricted part, and the angles are obtuse, 

 although a minute sinuation of the sides in front of them is more or less distinctly 

 present. The form of the thorax distinguishes the species from T. i/iodeslus, to which 

 it has a considerable general resemblance. Twelve examples. 



The single specimen from Lahaina has no definite characters to distinguish it. 



Hab. Maui. Haleakala, 4000 ft. (Blackburn and Perkins). Lahaina (Koebele). 



