SYBISTROMA. 153 



dages disappearing, according to the description and figures 

 given by Zeller_, in the 'Isis' of 1842. Introduced into the 

 British catalogues, probably by confusion with P. contristans, 

 Wd., or else for P. Wiedemannii. 



P. lobipes, Mg. zvv. 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 coxce, and the first half of the fore femora beneatli, 

 are pectinated with a few long pale spines, iu 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. DoUcJioptis \).,Y\i\.; 

 Lhm.; Ztt. ; Stn. ; Zlr.; Ahr. llypopUyllus, Hal. Medeterus '^., Mq. 



Antenn(E articulo tertio apice attenuato, arista dorsali sinuata. Pro- 

 boscis capite hrevior. Hypopyyiuni maris palUdmn pdiolatuin, appen- 

 dicibus temdhm apice fimbriatis. 



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; taperiny 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 

 forminy a sliyht anyle with the last joint. Wings with the pra3brachial 

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

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

 male somewhat compressed, mth 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 appendayes frinyed at the tip ; the outer pair not much enlaryed 

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

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



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

 Fin.; Ztt. — patelUpes, Mg. — ventralis, Ztt. {foeni.)'^ Obscure miea, 

 capite albido, palpis ferrugineis, pedibus pallidis, alulis palUdo-ciUatis ; 

 Mas. arista articulo primo lonyissimo, tarsormn anticorum articulo 

 ultimo pateUifornii atro. Long. 2^; alar. 5 Hn. 



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

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

 ruginous, long and })ointed in the male, which luis i\\Q penultiinate joint 

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



VOL. I. X 



