SYBISTROMA. 153 



dages disappearing, according to the description and figures 

 given by Zeller, in the f lsis' of 1842. Introduced into the 

 British catalogues, probably by confusion with P. contristans, 

 Wd., or else for P. Wiedemannii. 



P. lobipes, Mg. zw. iv. 38. 5, which has also found its way 

 into the list, resembles P. contristans, but it, too, has the fourth 

 joint of the fore tarsi bilobed in the male, and the fore femora 

 slightly pectinated beneath towards the base. 



The fore coxae, and the first half of the fore femora beneath, 

 are pectinated with a few long pale spines, in the females of all 

 the species ; and in the males of some, but more slightly. 



Genus II. SYBISTROMA. 



SYBISTROMA, Mg. zw. (1824); Mq. ; Stg.; Zlr. Dolichopus p., Fin.; 

 Lhm.; Ztt. ; Stn. ; Zlr. ; Ahr. Hypopliyllus, Hal. Medeterus p., Mq. 



Antennce articnlo tertio apice attenuate, arista dorsali sinuata. Pro- 

 boscis capite brevior. Hypopygium marls pallidum petiolatum, appen- 

 dicibus tmuibm apicv funhriatis. 



Eyes pubescent, separated in both sexes ; face very narrow in the 

 male ; lower orbit with fine pale cilia. Proboscis very short. Third 

 joint of the antenna: tapering almost to a point ; arista inserted above 

 near the middle of it, slender, almost naked, the penultimate joint ex- 

 tending beyond the end of the third, sometimes very long, curved and 

 forming a slight angle wit It the last joint. Wings with the prasbrachial 

 vein approaching the cubital towards the end in a gentle sweep (as in 

 many of the Dolichopl). Abdomen rather slender, tapering; in the 

 male somewhat compressed, with the sixth segment about as long as 

 the fifth, but destitute of bristles ; the inflected hypopyyium pale 

 except at the base, oblong, somewhat compressed, suspended on a 

 petiole formed of the slender seventh segment, and furnished with 

 several appendages fringed at the tip ; the outer pair not much enlarged 

 nor freely movable. Legs with few spines on the tibire, and none 

 on the hind metatarsus, which is shorter than the following joint. 



1. discipes, Ahr. fn. iv. 24 (1817); Lhrn. ! Mg.; Stg. patellata, 

 Fin.; Ztt. patellipes, Mg. ventralis, Ztt. (fcem.)? Obscure cenea, 

 capite albido, palpis ferrugineis, pedibus pallidis, alulis pallido-ciliatis ; 

 Mas. aristce articulo primo longissimo, tarsorum anticorum articulo 

 ultimo pateUiformi atro. Long. 2|-; alar. 5 lin. 



Brassy-olive, not shining ; face white, front duller whitish. Palpi 

 ferruginous. Antennae black ; third joint, except the base, brown or fer- 

 ruginous, long arid pointed in the male, which has the penultimate joint 

 of the long arista thrice the length of the last joint, while it is short in 



VOL. I. X 



