British Species of the Genus Gyrophcena. 247 



angle), basal half of abdomen, legs and antennae testaceous ; 

 thorax with the dorsal rows of punctures distinctly interrupted in 

 the middle ; elytra thickly and rather finely punctured and 

 rugulose. 



Male with a row of four short, longitudinal ridges on the 6th 

 abdominal segment ; the 7th with two horseshoe-shaped emargi- 

 nations at the apex, each emargination bounded externally by a 

 longish, somewhat incurved tooth, and the two emarginations 

 separated by a bifid process. 



Length 1^ lin. 



Among the larger species of GyropJic^na, G. nana holds a 

 middle position as to size. The head presents some large, scat- 

 tered punctures. The antennae are rather short and stout ; the 

 intermediate joints, 5th to 10th inclusive, are transverse; the 5th 

 moderately so ; the 10th nearly twice as broad as long. The 

 thorax is rather broader than the head, and nearly twice as broad 

 as long ; the outline nearly semicircular, the sides and posterior 

 margin forming an almost continuous curve ; the broadest part, 

 however, is rather behind the middle ; the anterior part truncate ; 

 the anterior angles slightly acute ; the upper surface evenly con- 

 vex, smooth and glossy ; the discoidal rows of punctures inter- 

 rupted in the middle ; usually each row is represented by three 

 punctures on the fore-half of the thorax, and the same number on 

 the hinder half; of these, the 2nd puncture from the base is con- 

 siderably larger than the others, which are not all of them always 

 present ; the two hindermost punctures of the rows are more 

 approximated than the others, and near them are seen one or two 

 small punctures on either side. Besides these, there are usually 

 two approximated small punctures on the anterior £!rd of the 

 thorax, and nearly midway between the dorsal rows and the 

 lateral margin ; and a large puncture is always visible a little 

 within the posterior angle. The lateral and posterior margins of 

 the thorax are margined, and narrowly edged with testaceous. 

 The elytra are about one-third broader than the thorax, and each 

 elytron is rather longer than broad ; they are testaceous, but have 

 a largish, triangular, black patch at the posterior outer angle ; 

 thickly punctured and rugulose, the punctures becoming gradually 

 more closely packed, and the surface more rugulose towards the 

 hinder part of the elytron, and especially near the posterior outer 

 angle within, which is a slightly depressed area. The posterior 

 segments of the abdomen are very finely punctured ; usually the 

 apical half of the abdomen is dark (black or pitchy-black), but 

 with the extreme apex often pitchy, and sometimes testaceous. 



