STAPHYLINID.^. 65 



segment of the hind body has a small but deep excision in the centre 

 which is almost entirely filled Avith a transparent membrane; the 

 jedeagus is furnished at its apex with a stout, abrupt, sharp and 

 roughly pentagonal appendage. L. 4|- mm. 



Widely distributed in Britain ; Dr. Joy says it is almost as common 

 as G. nigritzdus in the south of England. 



G. velox, Sharp (Ent. Mo. Mag. xlvi. (2 Ser. xxi.), 1910, p. 130). 

 A narrow black species, with the base of the antennfe and the palpi 

 testaceous ; the legs also are more or less testaceous ; the head is long and 

 narrow ; the species is very similar externally to G. jjennatus, and the 

 females are scarcely distinguishable, but the male characters are very 

 difierent ; in G. velox the redeagus naturally projects between the two 

 styles so that1;he form of its apex can be seen without dissection ; the 

 last ventral segment of the hind body is furnished with a narrow deep 

 excision, which is almost entirely filled with a transparent membrane ; 

 the sedeagus is rather elongate, with the apex obtuse and furnished 

 with a reflexed appendage, which is badly defined and is as it were 

 merged into the front part of the a^deagus ; it is, however, distinct, 

 if viewed laterally ; this organ is very like that of G. nigritulus, 

 bvat the latter insect is distinctly longer and twice as broad as G. velox. 

 L. 4| mm. 



Lymington (Sharp) ;. Oxford district (Walker) : apparently a rare 

 species. 



G. keysianus, Sharp (Ent. Mo. Mag. xlvi. (2 Ser. xxi.) 1910, 

 p. loO). This is one of the larger species and somewhat resembles G. 

 stipes. It is, however, distinctly narrower; the head is narrower in 

 proportion to the thorax ; the penultimate joints of the antennae are 

 much less transverse, although they are slightly so, and the femora and 

 elytra are darker ; it is a narrower species than G. nigritulus, and has 

 darker and thicker antennae and darker legs, which are pitchy, with 

 the tarsi reddish. In the male the last ventral segment has a broad 

 excision which is in gi-eat part filled with a transparent membrane ; 

 the fedeagus is remarkable, being elongate and transparent at apex, 

 with the extreme apex subacuminate, but really very minutely bidentate. 

 L. 5J mm. 



A scarce species : Devon, Slapton Ley (Keys and Champion), 

 Cornwall, and Keriy, Ireland (Joy) ; Southport (Donisthorpe). 



G. appendiculatus, Sharp (Ent. Mo. Mag. xlvi. (2 Ser. xxi.) 1910, 

 p. 131). Very similar to G. keysianus, but considerably smaller; deep 

 black, with the base of the antennse and the palpi pitchy and the legs 

 rufo-piceous, or almost black, with short, robust, reddish tarsi ; from 

 G. pennatus it may be easily distinguished by its much dai-ker coloui-, 

 broader head and shorter legs and antennae ; in the male the last ventral 

 segment of the hind body has a deep excision, in great part filled with 

 a transparent membrane ; the a?deagus is very remarkable, being shoi t 

 and robust, Avith a broad, short and very hard reflexed appendage. 

 L. 4| mm. 



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