Manchcsler Memoirs, Vol. Ixi. i.igi/), No.%. 3 



Specific Diagnosis. — Head small, elongated; wings 

 a little shorter than length of body. Sub-costa united with 

 radius in outer third of wmg. SuJD-costa, radius and radial 

 sector occupy outer third of wmg. Wing apex blunt. Median 

 vein much divided, and occupying outer half of inner 

 wing margin. Cubitus small. Anal area small. 



One of the most important insects in the .Stirrup Collection 

 is an almost comi>lete insect which cannot be referred to any 

 known genus. The insect lies upside down upon the stone, and 

 has a total length of 3g mm. The head is elongated, rounded 

 behind, and bears a jiair of diverging antennae, g mm. long. 

 Within the antenna?, a pair of mandibular-like structures are 

 discernible. These are 4 ram. in length. The prothorax is 

 much elongated, and widest posteriorly, anteriorly it is marked 

 off from the head by a slight constriction. The mesothorax 

 IS much broader than the prothorax, and bears the remains of 

 the wings. The right jjair of wings has been broken away near 

 their base and lost, whilst of those on the right side, little more 

 than the costal margin of the antenor wing is visible. 



Fragmentary traces of the chief veins of the wings of the 

 left side can be made out by means of enlarged ])hotographs. 



All three pairs of legs are present, the fore and hind legs 

 being well preserved, and the middle pair fragmentary. 



The abdomen is broad, well segmented, and about igmm. 

 long. A short backward prolongation on the right side may 

 represent a portion of the last segment, or one of a pair of 

 cerci. 



Wings. — The venation of the wings presents considerable 

 difficulty. Careful enlargements of the right forewing have 

 been made, and every portion of a vein traced off. By this 

 means, the course of the principal veins can be determined, 

 and portions of the smaller twigs. The junction of most of 

 the latter to the former is not clear. An exact analysis of the 

 wing structure is thus no easy matter. Notwithstanding the 

 fragmentary condition of the veins and associated twigs, cer- 

 tain features are very evident, and I think the following con- 

 clusions may be safely drawn. 



The costal margin is almost straight, and gently curves 

 into a well rounded and broad apex. The sub-costa is a feeble 

 vein, passing out parallel to the wing margin over two-thirds 

 of the wing, when it joins on to the radius. The radius is a 

 simple structure parallel to the sub-costa, and only separated 

 from it by a very narrow area. It reaches the wing margin at 

 the outer edge of the wing apex. The relations and character 

 of the radial sector, median and cubitus are not so easily 

 understood. 



Fragmentary portions of a few principal veins can be 

 traced across the middle of the wing, and portions of a numer- 



