188 D0LICH0P1D.E. 



the thorax, depressed, finely pubescent, scarcely ciliated ; of five seg- 

 ments, the first segment not sJiorter tJian the second' ; hypoinj(j'm'in of the 

 male short, imbedded, without visible appendages. Legs long and 

 slender ; posterior femora near the tip in front with a single bristle, 

 which is Avanting on the pectinated femora of the males ; posterior 

 tibiae with a few scattered spines ; hind metatarsus unarmed, a little 

 shorter than the following joint ; fore coxse more or less hairy towards 

 the tip, the posterior ones usually with a single bristle outside. In 

 the male the intermediate tibia is more or less distorted and pec- 

 tinated. 



The species of this genus are smaller than tlie Hydrophori, 

 which they much resemble^ and are less aquatic in their habits, 

 frequenting moist grassy spots, where they may be found, in more 

 or less abundance, at all seasons except mid-winter. 



The British species are few, and may be arranged thus : — 



a. Cilia of the lower orbit pale. 

 b. Face yellowish below. 



c. Third joint of antennae pointed. 



d. Thorax brassy-olive. Species 2. 



d d. Thorax dull brownish. Species 4. 

 c c. Third joint of antennae obtuse. 



e. Tore legs stout, with yellow coxae. Species 1. 



e e. Fore legs slender, coxae mostly dusky. Species 3. 

 b b. Face silvery-wliite. Species 6. 

 a a. Cilia of the lower orbit black. Species 5, 



1. scambus. Fin. dol. 19. 26 (1823); Mg. ; Mq. ; Hal.; Ztt.— 

 davitibiits, Koser. — Foem. prodronms, Mg. Olivaceus, fronte cyancs- 

 cente, hypostomate wfero lutescente, coxis anticis pedibusque ferriujineis 

 tarsis nigricantlbus, antennis obtusis ; Mas.femorihis anteriorihus pecti- 

 natis, tibiis intermediis dilatatis shmatls nigricantlbus, vietatarso brevis- 

 simo incrassato appendiculato. Long. 1-i ; alar. 4 lin. 



Olive. Front bluish. Face below taiony-yelloio ; above whitish, 

 nearly vanishing in the male. Antennae with the third joint obtuse 

 triangular in male, ovate in female. Thorax a little brassy ; scutellum 

 bluish. Wings dusky, with a faint dot at the convexity. Legs and 

 fore coxce feri'nginous, tarsi blackish except at the base. Iti the male 

 the fore femora are very thick, fringed beneath with curly whitish hairs, 

 and pectinated beyond the middle ; the tibia stout, armed with two 

 spines inside below the middle ; the first two joints of the tarsus hairy 

 behind ; the interniediate femora pectinated beneath, at first simply, 

 towards the tip with a double row of shorter spines ; the tibia much 

 dilated, compressed and sinnated, ciliated with long bristles outside and 

 at the tip, bluchish-brown , with the attenuated base ferruginous and 

 armed inside witli a double row of minide spines ; the metatarsus very 

 short, ferruginous, ihichened, armed with several black, hooked, and spiny 



