1 26 Insects. 



ther less than two thirds the length of the wings these three nervures 

 unite and cease, other nervures radiating from them to the margins of 

 the wing : in the genera Nymphes, Osmylus and Chrysopa, a princi- 

 pal nervure or double nervure extends from the base of each wing just 

 below the costal margin, which it appears gradually to approach, till 

 near the apex, where it follows the arcuate form of the wing, and gra- 

 dually vanishes before reaching the extreme apex. Myrmeleon, Stil- 

 bopteryx and Ascalaphus follow the same type of neuration, which is 

 worthy of notice, as making the discrepancy of Psychopsis in this re- 

 spect of much greater importance. Independently of this difference, the 

 neuration approaches that of Osmylus, and I incline to assign it the 

 filiform antennae of that genus. The outline of the wings would not 

 distinguish them fi'om those of many of our commoner Geometrae ; they 

 are rounded at the tip and slightly produced at the anal angle; when 

 at rest the wings are deflexed, and closely appressed to the sides of 

 the body, as in Flata, to which genus, when in such a position, it bears 

 a great although superficial resemblance, aided, in this individual, by 

 the total loss of its antennae. The eyes are black ; the head, thoraci- 

 cal segments and legs are yellow, they appear very similar to those of 

 Osmylus : the abdomen is somewhat clavate, hairy and lead-coloured. 

 The wings are nearly transparent, all the nervures being pale delicate 

 yellow : the fore wings are slightly tinged with yellow, intermixed 

 with tints of pale delicate brown, and are beautifully adorned with 

 numerous oblique transverse markings, of a deep, clear, distinct 

 brown ; all of these, except the last pair, originate in the costal mar- 

 gin and trend towards the anal angle of the wing ; counting from the 

 base of the wing, the first of these markings form an elongate shape- 

 less blotch, extending about a third the width of the wing ; next fol- 

 lows a pair of lines not quite equalling in length the blotch previously 

 described ; then another pair of lines, twice as long as the preceding 

 pair; then a third pair, equalling the second in length and enclosing a| 

 third abbreviated line ; then a fourth pair shorter than the second and 

 third; and lastly, a fifth pair, parallel with the outer margin, and 

 reaching neither the costal nor anal margin : at the anal angle, on the 

 extreme margin of the wing, are two black spots, immediately within 

 these is a vague but bright ferruginous spot, and above this an elon- 

 gate irregular mark of the same colour ; these ferruginous markings! 

 serve to connect the black spots with the third pair of lines previously] 

 described, forming altogether a fascia across the wing at its greatest^ 

 width ; the inferior or abdominal margin of the wing has eleven vei 

 delicate, short, oblique, brown lines, which point towards the tip :' 



