110 CLAVICORNIA. [Actwopteryx. 



dilated, broadest before base, alutaceous and not tuberculate, posterior 

 angles strongly produced and acute ; elytra considerably narrowed be- 

 hind, scarcely rounded at apex, very closely asperate ; legs and antennae 

 long and slender, clear yellow. L. f-f- mm. 



Under seaweed on the coast ; first taken by Mr. Haliday in Ireland ; it lias recently 

 been found in profusion at Kingsgate by Mr. T. Wood, in company with Actidium 

 coarctatum, and also at Margate. In the summer of 1886 I found it at Broadstairs, 

 and it has been taken at Weymouth ; it is probably more widely distributed on the 

 south-eastern and southern coasts than is at present known, but I have never found it 

 in the Isle of Wight, although I have searched for it. 



The species is very easily recognized by its habitat, shape, and thick 

 whitish pubescence. 



PTXNCXiXiA, Motschulsky. 



About a dozen species have been described of this genus from Europe, 

 America, and the Atlantic Islands, and one has comparatively recently 

 been found in New Zealand, so that the range of the genus is pro- 

 bably very extensive ; they are easily recognized by their narrow form 

 and short elytra, and as a rule by their very light colour ; they appear 

 to live only under bark of dead trees, especially beech, fir, oak, and 

 birch. 



I. Abdomen broader with apex obtuse. 



i. Thorax scarcely rounded in front, hardly constricted 



behind, head elongate P. BBITTANICA, Maith. 



ii. Thorax plainly rounded in front, constricted behind, 

 head rounded. 



1. Elytra broadest at middle. 



A. Thorax more strongly constricted behind ; form 



narrower P. TESTACEA, Heer. 



B. Thorax less strongly constricted behind ; form 



broader P. DENTICOLLIS, Fairm. 



2. Elytra broadest at apex P. MARIA, Matth. 



II. Abdomen narrower, with apex acuminate. 



i. Thorax feebly constricted behind ; elytra rather long . P. APTEEA, Guer. 

 ii. Thorax strongly constricted behind. 



1. Elytra longer; thorax considerably shorter than 



head P. TENELLA, Er. 



2. Elytra very short ; thorax hardly shorter than 



head P. ANGUS-TULA, Gyll. 



P. testacea, Heer. (Proteus, Matth. ; $ limbata, Heer.). Elongate, 

 rather obtuse, moderately convex, yellow, sparingly clothed with pale 

 hairs j head large, rather elongate, rounded in front, eyes rather variable, 

 antennae long and slender, pale yellow, with the two basal joints very 

 large ; thorax moderate, a little broader, but scarcely longer, than head, 

 broadest before middle, with the sides slightly margined, strongly 

 rounded in front and constricted behind, closely and finely tuberculate, 

 posterior angles very acute and prominent ; elytra not dilated behind, 

 widest at middle, rather finely and remotely asperate, apices strongly 



