154 STAPHYLiNiD.®. \_GyTO]}haina. 



i. AntcuiijE with joints 6-10 not or slightly transverse, 

 thorax puncturetl in two rows. 



1. Elytra ahnost smooth ; upper surface testaceous with 

 the head, postero-external angles of elytra, and a 



narrow band on hind body, pitchy G. PULCHELLA, Heer. 



2. Elytra sparingly but distinctly punctured ; upper 

 surface pitchy red or brownish with base of elytra 



lighter G. AFFINIS, Sahlh. 



ji. Antenna; with joints 6-10 more or less strongly trans- 

 verse. 



1. Base of thorax more or less punctured G. PoWEBl, Crotch, 



2. Base of thorax not punctured. 



A. Elytra distinctly, thickly, and somewhat rugosely 

 punctured ; thorax with two rows of punctures on 



disc. 



a. Fourth joint of antennaj hardly transverse not 

 much narrower than the fifth, 5-10 moderately 



strongly transverse; upper surface generally lighter G. GENTILIS, JSr. 



b. Fourth joint of antenna; plainly transverse, much 

 narrower than filth, 5-10 strongly transverse; 



upper surface generally darker G. NANA, Payh. 



B. Elytra finely, and hardly rugosely punctured, with 



the interstices plainly shagreened ; upper surface 

 mostly reddish testaceous ; hind body almost 

 smooth. 



a. Thorax with two rows of punctures on disc ; 



length 2 mm G. CONGRUA, Er. 



b. Thorax sparingly and diffusely punctured ; length 



1mm G. MINIMA, i^'r. 



C. Elytra smooth or almost smooth on disc, obsoletely 



punctured towards postero-external angles; thorax 

 with two rows of punctures. 



a. Length 2 mm. ; thorax and hind body more or 

 less testaceous or brownish testaceous : hind body 



smooth G. i^viPENNis, Kr. 



b. Length 1^ mm.; thorax and hind body black ; 



hind body closely and obsoletely punctured . . G. lucidula, Er. 



D. Elytra closely and uniformly ])unctured : upper 



surface entirely black : length 1 mm.; hind body 



rather thickly punctured G. MANCA, Er. 



II. Head not, or feebly, transverse, gradually contracted be- 

 hind the eyes, which are scarcely j)rominent, and are 

 separated from thorax by a rather wide interval, colour 

 entirely pitch-black G. stkictula, Er. 



In all the following species of Gyropluena (with the exception of G. 

 efrictula) the head is strongly transverse, with the eyes prominent, and 

 in all the species the thorax is much broader than long, and narrower 

 than elytra, Avith the sides rather strongly rounded ; the liead, thorax, 

 and elytra are nearly always plainly shagreened between the punctures : 

 for a detailed account of the British species the student is referred to the 

 valuable paper on them by Mr. G. R. Waterhouse in the Entomological 

 Society's Transactions for 1861 (p. 241), to which I am much indebted 

 in the following descriptions ; the differences in the seventh segment of the 

 hind body in the males of the various species are exceedingly important, 



