388 PROCEEDINGS OF THE ACADEMY OF 



ODONATA (iESCHNINA.) 



[H]erpetogomphus ? rupinsulensis, n. s. $ Greenish yellow. Head wit& 

 the vertical vesicle yellow behind, black in front, cariniform, transverse, 

 scarcely emarginate, slightly recurved, rounded off at the ends, not abbre- 

 viated ; all between this and the front black, except the region of the antennae, 

 which is a little varied with brown ; antenna? black, first joint yellowish at 

 tip ; labrum with a fuscous basal dot on each side ; tips of mandibles brown ; 

 central lobe of labium pale livid blue, black on the terminal margin, the 

 lateral lobes pale ; occiput straight, scarcely elevated in the middle, densely 

 ciliated with long black hairs. Dorsum of the thorax with its medial carina 

 brown-black at the first commencement of its bifurcation for one-third of a 

 millimetre, also towards the point where its two branches join the base of 

 the anterior wings ; an abbreviated pale brown line in the humeral suture 

 above ; pleura with the spiracle edged with brown-black ; otherwise the 

 entire thorax is immaculate above and below. Abdomen pale brown, clouded 

 with brown, especially behind the medial suture of the segments, which ia 

 brown and glabrous, and with the extreme edges of all the segments brown ; 

 earlets of the second segment yellowish, externally margined with pale brown ; 

 joint 1 mostly greenish yellow ; a basal, glabrous, brown annulus on joints 

 3 7, with indications of a basal lanceolate pale brown spot, suddenly con- 

 tracted behind its middle and surrounded by brown shading, on the dorsum 

 of 2 9, tolerably distinct in 7, in 8 becoming very obvious ; 8 and 9 laterally 

 as much dilated as in Gomphus fraternus, and on the lateral submargin almost 

 greenish yellow ; joints 8 10 each about one-third shorter than the preced- 

 ing ; venter pale yellowish green. Abdominal appendages all greenish 

 yellow, with long dense pale hairs ; the superiors longer than the 10th but 

 shorter than the 9th abdominal joint, directed rather downwards, very 

 robust, approximate at base, distant at tip about one-half millimetre ; viewed 

 from above they are convex outside, concave inside, tapering gradually, and 

 obtuse at tip ; viewed laterally, they have an inferior carina, and their tip is 

 squarely truncate, and on their terminal half below are about three irregular 

 rows of small short black teeth ; the inferiors touch the superiors at base and 

 are scarcely shorter than they are, exactly attaining the lower angle of their 

 truncated tips ; viewed from below they are almost cylindrical, very robust, 

 and much rounded at tip ; viewed laterally their inferior edge is slightly 

 curved upwards, and their upper edge is semicircularly emarginate for two- 

 thirds the distance from their base, the other third part being obliquely 

 truncate so as to be almost parallel with the lower edge of the upper appen- 

 dage ; on the base of each lower appendage beneath and covering it for one- 

 third its length is a quadrangular anal process, carinate behind on its three 

 margins, the two processes divaricate and connate at their base. Legs pal8 

 yellowish green ; the trochanters brown beneath, anteriors very slightly, 

 intermediates and posteriors notably ; anterior femora with a broad anterior 

 brown vitta, the four posterior femora much marked with brown beneath, 

 but anteriorly with only a short terminal vitta ; tibia? all with a wide inferior 

 black vitta ; anterior and intermediate tarsi black, posterior tarsi black 

 beneath, but above with only their tips and incisures widely black. Wings 

 hyaline, slightly fiavescent at base ; veins and cross-veins black, except the 

 costal vein which is greenish-yellow anteriorly till a little after it attains the 

 pterostigma ; pterostigma pale brown, its internal cross-vein prolonged as 

 usual, surmounting Ah 5 cells ; membranule small, cinereous, in the poste- 

 rior wings only extending half way to the anal angle, which is acute and 

 normal. Antecubitals 13 14; postcubitals 9 10. Two discoidal areolets, 

 commencing with two in the front, with three in the hind wings. 



Length $ 54 mill. Alar expanse $ 68 mill. Pterostigma super. 3 mill, 

 infer 3 mill. One $ ; $ unknown. 



[Sept. 



