300 FAUNA HAWAIIENSIS 



rugulose, clothed with a short, sparse pubescence and has a median carina. The 

 abdomen is compressed, pointed at apex and considerably longer than the head and 

 thorax united, with some pubescence at extreme base, the girdle not being well defined, 

 the petiole being extremely short and striate. 



^. Length 2 mm. Wholly black, except the legs, the antennae being very much 

 longer than in the female, 15-jointed, the joints of the flagellum all long, subcylindrical 

 and fluted, the first two a little shorter than the following, subequal ; abdomen much 

 shorter than in the female, not longer than the head and thorax, blunt at apex ; other- 

 wise as in the female. 



Described from i ^ and 2 % specimens. 



Hab. Hawaii : Kilauea, in September. 



Trybliographa Forster. 

 1869. Trybliographa Forster, Verb, zool.-bot. Gesell. Wien, xix. pp. 345 & 359. 



( I ) Trybliographa haivaiiensis, sp. nov. 



%. Length 2"2 mm. Polished black; first two joints of antennae rufo-piceous ; 

 legs brownish-yellow ; wings hyaline, the veins brown, the marginal cell completely 

 closed, the cubitus distinct to near the apex of the wing but becoming pale coloured just 

 beyond its origin. 



The antennae are i 3-jointed and extend to the base of the abdomen ; the scape is 

 obconical, nearly as long as the first joint of the flagellum but much thicker, the pedicel 

 globose ; the flagellum gradually and imperceptibly thickens towards the apex, the last 

 joint being ovate, nearly as long as the first joint but fully twice as thick ; the first joint 

 of the flagellum is subcylindrical, a little thicker at apex than at base, and, although the 

 slenderest joint, it is yet the longest ; the following joints are all fluted, oval or sub- 

 moniliform, not much longer than thick, the second joint being shorter and not so stout 

 as the third. The scutellum is longitudinally striate at the sides, the cup being narrow, 

 ellipsoidal. The metathorax is opaque, pubescent and has a sharp carina down the 

 middle. The abdomen is compressed, but not longer than the head and thorax united, 

 with an elevated, densely pubescent girdle at base, and seen from the side has its apex 

 obliquely truncate. 



Described from one ? specimen, taken in January 1896, from a decaying stem of a 

 Lobelia tree. 



Hab. Hawaii : Hilo (2000 feet). 



