Tachyiim.'] stapiiylinid.'E. 1-15 



of MtM-soy find Irwcll ; Nortlimnbcrliuul distrii-t, ratlior common; Scotland, common, 

 Tweed, Kortli, and Solway districLs. 



T. umbratica, Er. Shining pitchy-black, with tlic elytra some- 

 times obscurely brown, finely anil thickly pubescent and punctured ; 

 head large, subquadrate, about as broad as tliorax, antennixj long, feebly 

 thickened, joints 4-10 gradually a little broader but all longer than broad, 

 brownish or pitchy-red ; thorax almost square, narrower than elytra ; 

 elytra about as long as tliorax, not so broad and squarer than in T. flavi- 

 tarsis; hind body parallel-sided, very finel}^, thickl}-, and nniforndy 

 punctured ; legs pitchy, knees, tarsi, and sometimes tlie entire tibiae, 

 testaceous. L. 3 mm. 



INIale with the ventral plate of seventh segment o.f hind body prolonged 

 and rounded at apex. 



Banks of streams and rivers ; local, but not uncommon in some places ; Mickleliam 

 (l>anks of the Mole); Weybridfjo (hanks of tlie Tbames); Tonbiidge; Sliiplev, near 

 Horsliam ; Lee; Hastings; South Wales; Hewdley ; 'I'ewkesbui-y ; Nortliumbeiland 

 district ; recorded from the Tweed and Dee ilistricts, Scotland, but Dr. Sharp con- 

 siders it doubtful whether the specimens were correctly named. 



T. atra, Grav. {Tliinonoma afra, Thoms.). This species is easily 

 distinguished from the preceding by its darker and much duller colour, 

 and darker and more slender antenucx?, of which the penultimate joints 

 are longer ; the general punctuation is distinctly finer; the elytra are 

 broader in proportion to the thorax ; the hind body is less parallel, with 

 the sides somewhat rounded and plainly narrowed from the hinder 

 portion of the fourth segment to apex ; the legs are as a rule darker ; 

 the male has the ventral plate of seventh segment of hind body strongly 

 rounded and much prolonged. L. 3 mm. 



Marshy places, banks of streams, &c. ; local, but not uncommon ; London district, 

 generally distributed ; Deal; Coleshill ; Cannock Chase ; Eggington, near Burton-on- 

 Trent ; Repton ; Scarborough ; Manchester ; Scotland, rare, Lowlands, in marshes, 

 Tay and Solway districts; Ireland, Dodder Banks, near Dublin. 



T. concolor, Er. {Brachjiusa conrolor, jMuLs. et l^ey). This species 

 rciremblcs the preceding in colour and punctuation but is at once disiin- 

 guished by its shorter and broader form, short and transverse head and 

 prominent eyes, shorter antennse, and short, broad, transverse thorax 

 which is nearly as broad at base as base of elytra ; the elytra are plainly 

 broader than thorax, and are a little wider at apex than at base ; the 

 hind body is gradually and somewhat strongly narrowed towards apex ; 

 legs pitchy, knees and tarsi yellowish. L. 2-2| mm. 



Male with thorax broadly furrowed longitudinally, dorsal plate of 

 seventh segment of hind body broadly emarginate, ventral jilate much 

 produced. 



]\Iarshy places; rare; first found in Britain by Dr. Power; it has only occurred 

 hitherto in the London district ; Hammersmith and Notting Hill Marshes, Lee, 

 Barnes, Forest Hill, Mickleham, Chelsea, Kltham. 



VOL. II. L 



