NEUROPTERA 2,7 



$ appendices very long and narrow, the sides subparallel, with an apical depression 

 outwardly, rounded at their extremities ; inwardly on their apical portion furnished with 

 short somewhat spinose hairs, which are directed inwardly. Between the appendices 

 there may be seen a short chitinous process, with the apex bifid, forming two spines. 

 Ventral valve very narrow, sublinear, its sides parallel in dorsal or ventral aspect, curved 

 upwards and clothed with long hairs. (Plate IV. figs, i, 2, 16 & i6«.) 



Expanse 13 — 17 mm. 



Hab. Found all over the group, in the mountains, but not very abundant. This 

 species has no relation with the rest of the Hawaiian Hemerobiidae, and I suspect it 

 has been introduced. 



Nesomicromus, gen. nov. 



Allied to Micromtis, some of the species having the superficial appearance, as well 

 as the nervuration of that genus. The wings are either rounded at the apex, or falcate, 

 somewhat resembling Drepanopteryx, the one form passing gradually into the other, 

 so that the species cannot be subdivided on this character, although the extreme forms 

 are vastly different. The species with simply rounded wings can (so far as I can see) 

 only be separated from Micromus by the length of the joints of the maxillary palpi, in 

 which they also agree with the species which have falcate wings. The penultimate joint 

 of these palpi is very short, being only about half as long as the terminal. 



The c/ characters are very similar throughout the genus, the appendices being rarely 

 very conspicuous, usually of triangular form and pointed at the apex. In all the species 

 they give off each from their lower margin towards the base a fine spine, and slight 

 differences in the length, form, etc. of these spines furnish useful specific characters. 

 The general similarity in the form of the appendices, which extends also to the two 

 following genera, is very remarkable. As in Micromus, there is no free cellule formed 

 by a recurrent nervule at the base of the wing. 



(i) NesomicroTnus vagus, sp. nov. 



Brown or black ; face, legs and palpi paler. Antennae varying in colour from 

 testaceous to nearly black. Thorax with short pale pubescence. 



Anterior wings brownish or grey-brown (grey in immature examples), generally 

 with a small pale spot towards the base, situated on the cubitus posticus. Gradate 

 nervules more or less infuscate, forming two transverse darker lines on the wings, often 

 irregular and broken, sometimes wanting. Apical margin evidently, but slightly excised, 

 giving the wings a hooked appearance at the tip. Nervuration dark, sometimes (with the 

 pterostigma) more or less pink, the nervures with short and very inconspicuous hairs. 



