38 FAUNA HAWAIIENSIS 



Radius normally with 5, rarely 4 or 6 sectors ; in the latter cases the number is often 

 different on the two sides of the same insect. 



Posterior wings subinfuscate, but paler than the front wings and more transparent, 

 nervuration generally dark, the apical margin very slightly excised below the tip of the 

 wing. 



^ appendices viewed laterally, sub-triangular, narrowly rounded at the apex, on 

 their inferior margin inwardly they are furnished each with a fine spine, curved upwards, 

 and under a very strong lens finely serrate or dentate, the spines extending backwards 

 rather beyond the apices of the processes. (Plate IV. fig. 3.) 



Expanse 12 — 18 mm. 



Hab. Common all over the group in mountain forests, and sometimes found on 

 the coast. 



(2) Nesomicromus latipennis, sp. nov. 



Allied to the preceding, and of similar colour. 



Anterior wings brown, posterior pair infumate. Radius with 5 sectors. Readily 

 known by the very broad and short wings, the apical margin not perceptibly emargi- 

 nate ; the posterior pair very obtuse, their apical margin almost straight, not slightly 

 concave. (Plate IV. fig. 4.) 



Expanse 15 mm. 



Hab. Kona, Hawaii (3500 ft.); i % June, 1892. 



(3) Nesomicrojnus angustipennis , sp. nov. 



Closely allied to N. hawaiiensis, but with the wings narrower and the apex 

 somewhat more produced. The radius gives off 6 or 7 sectors. The cellules formed 

 between the outer and inner series of the gradate nervules are extremely narrow in 

 proportion to their length, and this fact gives a character to the wing by which the 

 species may be easily recognized. 



The body and anterior wings are brown, but only gradually arrive at this colour, 

 being pale for some time after the emergence of the insect. Normally there is a small 

 pale spot towards the base of the wing on the cubitus posticus, and the radius bears 

 alternate pale and dark spots as in N. hawaiiensis. The variation of the present species 

 also appears analogous to that ot the other, the nervuration and pterostigmata being pink 

 in some examples, and the wings in some are evidently less narrow than usual, etc. 



The Z characters differ, in that the spines of the apical processes are shorter, and 

 do not reach to the apices of the processes themselves. (Plate IV. fig. 5.) 



Expanse 12 — 16 mm. 



Hab. Mountains of Kauai (4000 ft.). 



