154 EllNEST HILL AND L. G. HAYDON. 



patches near the base and at the bifurcation ; variable yellow 

 spots on the anterior, and a large yellow patch on the 

 posterior branch. Sixth long'itudinal vein yellow and black 

 alternately. Fringe black, a golden spot opposite termina- 

 tion of all veins, and in some instances a light patch on the 

 proximal side of the sixth. The number of actual spots other 

 than on costa and first longitudinal vein is uncertain and 

 asymmetrical . 



The male. — Wing is less thickly clad, and the proportion 

 of yellow scales is always higher. 



Length of detached wing, 3'8 mm. to 4*2 mm. 



Legs. — Black; femur and tibia of all brilliantly spotted 

 with pale yellow, and the metatarsus banded with three or 

 four bands of white or pale yellow. On the fore legs is a 

 broad white band at the apical extremity of the metatarsus, 

 and all tarsid segmeuts, except the fourth ; the hind legs 

 similarly adorned, but the apical band of the first tarsus very 

 broad, and the distal two thirds to one half of the second, 

 and the third and fourth snoAv-white. In the mid-legs there 

 is a barely perceptible apical ring on the tarsal segments. 

 Knees black in all legs. 



This species is very rarely found, and we have insufficient 

 specimens on which to base a table of wing--markings. It is 

 quite unmistakable ; although at first sight, under a magnifi- 

 cation of X 10, it resembles Nyssorhynchus pre tori- 

 en sis, the character of the wiug scales immediately shows 

 the difference. 



The Larva (PI. XXIII). — Determined on ten specimens, 

 drawn from comparison of eight and five last larval moults. 



General aspect. — A large larva, deeply pigmented 

 generally with dark brown, very like in shape to a three-parts 

 grown paludis; in water it looks slim, but measurement 

 proves the thorax exceptionally broad as contrasted wdth 

 the small head, and in this respect also it resembles paludis. 

 Antenna. — There is no branched hair on shaft. Spines 

 equal, terminal hair divides generally into six or eight 

 branches. 



