1877.] 85 



stripe, faintly edged with darker green than the ground, and on either 

 side are two faintly paler ragged lines also edged with darker green ; 

 the lines of the back all terminate in front of the anal flap which is 

 light yellowish-green, with a sprinkling of most minute black freckles ; 

 freckles also occur on the hinder parts of the anal legs ; a fine short 

 bristly black hair proceeds from each of the usual tubercular situations, 

 but can only be seen with a strong lens. 



The pupa skin is nine-sixteenths of an inch in length, of ordinary 

 shape, thickest at the ends of the wing-cases, plump in charactei% 

 tapering rather suddenly to the anal tip, w^hich has a small projection 

 and a spike from it divided in two sharp points, the abdominal divisions 

 are smooth, the rest of the surface finely punctate ; the colour dark 

 mahogany-brown, and rather shining ; on the abdomen a few extremely 

 fine short hairs pointing backwards. 



Emsworth : Atigv.st 9th, 1877. 



DESCRIPTION OF A NEW NEUROPTEEOUS INSECT FROM NEW 

 GUINEA, BELONQINa TO THE GENUS MYIOBACTYLUS, BRAUER. 



BY R. McLACHLAN, F.R.S. 



Mtiodacttlus nebulosus, n. sp. 



Form of M. osmyloides (Brauer), but much larger. Body yellowish (perhaps 

 greenish in life). Head with a transverse median impression in the middle above, 

 and with a narrow, longitudinal, median impressed line extending from the posterior 

 margin to between the antennae, on either side of which posteriorly is an abbreviated, 

 longitudinal, fuscous sulcus ; face and palpi pale yellowish, the tips of the mandibles 

 piccous. Autcnnse much shorter than the wings, stout, about 42-joiuted, very pale 

 claret colour with fuscovis hairs. Pronotum with a broad, median, longitudinal, 

 brownish-claret-coloured vitta ; hairs whitish. The whole under-side of head and 

 thorax Tcry pale yellowish. Legs whitish (or very pale greenish-white), with long 

 whitish hairs. Abdomen brownish (colours changed), with short whitish hairs ; 

 last dorsal and ventral segments both produced in an acute boat-shaped maimer ; 

 from witliin the last ventral segment proceeds a stout, up-curved process (penis ?). 



Wings whitish, semi-opaque, as if oxidized. Anterior pair oval, the costal 

 margin much rounded, strongly ciliated with pale hairs ; costal area very broad : 

 neuration whitish ; the base of the forks in the costal area, and apical area, and the 

 origins of the branches of the sector, black ; some of the discal transverse vcinlets 

 smoky, margined with pale smoky-grey ; pterostigma (in both pairs of wings) claret- 

 coloured with a pale smoky-grey cloud beneath it extending to the point of junction 

 of the sub-costa and radius ; a pale, smoky -greyish, oblique streak extending from 

 the extreme apex of the wing to the anal angle, but leaving a narrow clear space 

 between it and the margin ; sector emitting eleven principal branches. Posterior- 

 wings very narrow, dilated gradually to the sub-acute apex ; forks in the apical ai'ea 



