188 DOLICHOPID^E. 



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

 ments, the first segment not shorter than the second ; hypopygium 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 wanting on the pectinated femora of the males ; posterior 

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

 shorter than the following joint ; fore coxae 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 the 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 antennse pointed. 



d. Thorax brassy-olive. Species 2. 

 dd. Thorax dull brownish. Species 4. 



c c. Third joint of antennae obtuse. 



e. Tore legs stout, with yellow coxa?. Species 1. 



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

 b b. Pace silvery -white. Species 6. 

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



]. scambus, Fin. dol. 19. 26 (1823); Mg.; Mq.; Hal.; Ztt.-r- 

 clavitibius, Koser. Fcem. prodromus, Mg. Olivaceus, fronte cyanes- 

 cente, hypostomate infero lutescente, coxis anticis pedibusque ferrugineis 

 tarsis nigricantibus, antennis obtusis ; Mas. femoribus anterioribus pecti- 

 natis, tibiis intermediis dilatatis sinuatis nigricantibus, metatarso brevis- 

 simo incrassato appendiculato. Long. 1-| ; alar. 4 b'n. 



Olive. Front bluish. Face below tawny-yellow, above whitish, 

 nearly vanishing in the male. Antennas 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 ferruginous, tarsi blackish except at the base. In the male 

 the fore femora are veiy 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 intermediate femora pectinated beneath, at first simply, 

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

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

 at the tip, blackish-brown, with the attenuated base ferruginous arid 

 armed inside with a double row of minute spines ; the metatarsus very 

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



