HYDROPHORUS. 1 83 



Brassy-green, varying to coppery-red, somewhat hoary beneath. 

 Face silvery-white in male ; hoary in the female, as well as the front. 

 Thorax faintly striped. Wings hyaline, usually tinged with ferru- 

 ginous towards the fore edge, the subapical vein strongly bent in the 

 middle, in the male nearly forming alternate right angles. Abdomen of 

 the male with the sixth segment but little exserted ; lamella oblong, 

 compressed, broad at the tip and truncated. Legs brassy-green, the 

 femora and tibiae at their junction bright fulvous ; tarsi black, posterior 

 metatarsi glossed with green ; fore tarsus not longer than the tibia. 



On waters, both fresh and brackish. (E. I.) 



The next species is the only native representative of a peculiar 

 group, with longer antennae, the first joint as long as the next 

 two together, the third very slightly toothed at the lower edge ; the 

 prosternum with several spines at each side ; the wings coloured, 

 with the base pale yellowish, extending along the fore edge to the 

 half of the wing ; the hypopygium of the male, besides the keeled 

 lamella beneath, furnished with a longer pair of pale yellow mem- 

 branous lobes in an unusual position, arising one at each side 

 close to the margin of the fifth segment, and extending backwards 

 and outwards, so as to be entirely visible from above, contracted 

 at the end into a slender incurved style ; the fore tibia obliquely 

 produced at the tip inside, forming in the male a compressed lobe 

 there and armed with some teeth higher up, the thick fore femora 

 very spiny below. In the same sex the intermediate femora and 

 tibise are garnished with long hairs and spines. 



3. notatus, Fb. sp. ii. 448. 65 (1781); Mg. ; Mq.; Ct. ! Ztt. 

 armiger p., Fin. Obscure ceneus, thorace fusco-lineato, alts hyalinis, 

 venis fusco-limbatis, basi albida; Mas. appendicibus analibus flavidis im- 

 maculatis intus ciliatis, tibiis anticis dente interne bifido, intermediis 

 apice pectinatis et cirrosis, metatarso pectinato. Long. 2^ ; alar. 6 lin. 



Dull brassy. Front opake blackish-brown. Face narrow, in the 

 male white, in the female grey. Thorax with four dusky stripes, the 

 intermediate two close together. Wrings hyaline, the veins broadly bor- 

 dered with brown, a darker dot on the flexure of the subapical vein, and 

 a double one on the transverse vein ; the base of the wing and the fore 

 edge to the middle pale yellowish. Abdomen short, flat above, with 

 very slight blackish pubescence ; the ordinary lamella dusky, half as 

 long as the abdomen, attenuated at the tip and cleft ; the pale yellow 

 anal appendages oblong, concave behind^ and fringed on both edges and 

 about the base with long pale hairs, the terminal style naked and spot- 

 less. Legs dark green, with blackish tarsi; the fore tarsus nearly 

 twice as long as the tibia, the hind metatarsus a good deal longer than 

 the following joint ; the hind coxa3 with a bristle outside ; the fore 

 femora prickly in front and pectinated beneath; the tibia spinous 



