Batrisua."] CLAVICORXIA. 93 



separate off callose prominences on sides in front, and with fine central 

 furrow, the three furrows terminating in punctures at base, which are 

 situated in a semicircular line ; elytra much broader than thorax, convex, 

 broadest behind middle, finely and very obsoletely punctured with ah 

 entire sutural stria and a very short dorsal stria, humeral prominences 

 distinct ; abdomen about as long as elytra very finely punctured ; legs 

 red, femora thickened in middle, tibiae thinner at base. L. 2 mm. 



Male with the last two joints of antennae larger than in female, the 

 ninth being obliquely truncate at apex, and the intermediate femora with 

 a very minute spinule in middle ; the last ventral segment of abdomen 

 also in this sex is foveolate. 



In ants' nests, usually in old trees ; also in rotten wood-mould of old oak, ash, and 

 beech trees ; local and as a rule rare; Ashtead, Surrey (Champion) ; Loughton, Essex ; 

 Birch Wood and Purley Oaks (Power); B.irham, Suffolk; New Forest; Bagots 

 Park, Staffordshire, and near Gainsborough (Gorhain) ; Sliervvood Forest (Blatch) ; 

 Shrewsbury ; Ripon ; I have taken it at Sherwood Forest in a nest of Formica full- 

 ginosa in an old tree, and at lilting, near Maldon, Essex, in an old oak stump with 

 Paromalus, Abrceus, &c. ; it appears also to oecur with Formica rufa and Latiua 



brunneus. 



. 



R1TBAXIS, Saulcy. 



This genus, which has until recently been included under Bryaxis, 

 comprises a considerable number of species which are widely distributed 

 throughout the world ; it is distinguished from Bryaxis by having the 

 inflexed margin of the elytra longitudinally sulcate, by the sculpture of 

 the thorax, and by the structure of the apex of the elytra in male ; in 

 our. species the male has the antennae much longer than in the female ; 

 it was therefore described as a separate species by Denny. 



R. sang-uinea, L. (longicornis, $ Denny). Black or pitchy-black, 

 shining, palpi testaceous, antennae and legs reddish or pitchy.-red, elytra 

 bright red with suture, base and apex usually more or less darker- head 

 somewhat narrower than thorax with deep furrows, almost impunctate ; 

 antennas long, fifth joint longer than those contiguous to it ; thorax 

 somewhat variable in larger and smaller specimens, but usually much 

 broader than head, broadest before middle, with three equal fovese at 

 base connected by a furrow ; elytra as long as together broad with a 

 sutural and dorsal stria ; abdomen black and shining, first visible dorsal 

 segment longest, with two impressed lines in centre, the margin a little 

 reflexed, apex obtuse ; legs long, slender, and rather compressed, tarsi 

 pale. L. lf-2| mm. 



Male with the antennas longer, and with the anterior tibise armed with 

 a small tooth on their inner-side a little below the middle, and sinuated 

 towards apex. 



Marshy places in flood refuse, at roots of grass, &c. ; locally common ; Leo, 

 Strood, Sheerness, Snodland, Egham, Claygate; Dagenham, Essex ; fen districts of 

 Norfolk and Cambridgeshire, sometimes very abundant; Kingsgate; Folkestone- 



