NETJROPTERA. 



5 



Family SERICOSTOMA TIDJE. 



DlNARTHRUM INERME, n. Sp. 



10 $ , 4 ?, the latter in spirits, Leh, 7th September. 



Male brownish, clothed with greyish-brown pubescence. Basal joint of antennae rather 

 longer than the head and entire thorax united, its basal portion black, but the apical portion 

 brown ; somewhat compressed laterally, nearly straight, but with a slight bend in the basal 

 portion to about the middle, unarmed, but the basal half beneath has a very dense fringe of 

 thickened black hairs ; this portion above, and all the apical half, are furnished with long out- 

 standing grey hairs : thread of the antennse longer than the wings, pale- yellow, very distinctly 

 annulated with brown up to the tips. Maxillary palpi long and slender, with a small ter- 

 minal joint ; the basal portion clothed with long and dense thickened ' and ordinary grey 

 hairs, intermingled (but with no short ' scales '), the terminal joint with ordinary hairs only. 

 Labial palpi small and slender, pale-yellowish. Legs pale yellow. Anterior wings greyish ; 

 the costal margin for more than half its length from the base has a very dense inturned 

 fringe of thickened blackish-grey hairs; the membrane lightly clothed with short greyish 

 pubescence, and with numerous small, deep, black ' scales '; but there is a broad median 

 longitudinal space free from ' scales,' limited inferiorly by a narrow groove extending from 

 base to apex ; apical fringes greyish, very long on the apical portion of the inner margin : 

 neuration pale ; discoidal cell short ; nerves very irregular below the groove, forming large 

 cellules. Posterior wings slightly paler than the anterior, with a few scattered black 

 ' scales ' on the costal portion, but otherwise with only slight and very short greyish pubes- 

 cence ; fringes very long and greyish ; discoidal cell very short. 



Dinartkrum inerme, McLachlan, male. 



Fig. 1. Head, &c., from side. 

 2. Neuration of wings. 



3. Apex of abdomen, above. 



4. Apex of abdomen, from side. 



The 9th dorsal segment of the abdomen rather broad, brown, its margin produced in 

 a triangular form, fringed with yellowish hairs ; from each side of it proceeds a large yellow 

 triangular plate with the apex considerably produced and sub-acute, apparently connected 

 with two yellowish median parts, little prominent, and separated one from the other. In- 



1 Under the microscope, with K high power, each of these thickened h;iirs has a peculiar rugose appearance. 



