of New British Hymenoptera. cxxvii 



Family — Apid,e. 



Genus — Nomada, Scop. 



Noma da mis tuba. 



Male : length 3j lines. Black, the mandibles ferruginous, with a spot at their 

 base, and the margin of the clypeus yellow ; the labrum has a minute tooth in the 

 centre ; the antennas ferruginous beneath, and the three or four apical segments en- 

 tirely so ; the scape black : the thorax has a spot on each side of the collar, and the 

 tubercles yellow ; the apex of the femora, the tibia, and tarsi yellow-ferruginous ; the 

 anterior and intermediate tibiae have a black stain above ; the posterior pair black, ex- 

 cepting their base and apex : the tegulas and nervures of the wings piceous, the apical 

 margins fuscous : the abdomen has the margin of the basal segment rufopiceous, and a 

 band of the same colour across the other segments ; the second and third segments have 

 on each side an oblong, yellow macula, acute within : a very minute spot on the sides 

 of the third, and the margins of the fifth and sixth yellow ; beneath, the margins of the 

 segments are rufopiceous ; and the third and fourth have on each side a narrow, yellow 

 line, curving upwards towards the centre, and terminating in a round spot. 



In my own collection. 



The only described species, with which I am acquainted, that appears to resemble 

 ours is the N. melanostoma of Herrich-Schaffer, but his description is too recondite 

 to be satisfactory ; it agrees, however, with mistura in having a black scape, scutellum, 

 clypeus and labrum ; but he does not mention the tooth with which the labrum is 

 armed. This insect was captured by W. Hewitson, Esq., at Weybridge, and kindly 

 presented by him to my collection. 



Frederick Smith. 



Art. XIX. — Description of a New British Species of the Genus Actinia. 

 By William Thompson, Esq. 



Natural Order — Polypes charnus, Cuvier. 



Genus — Actinia, Linneus. 



Actinia clavata. 



Body subcylindrical, a quarter of an inch in diameter ; tentacula placed in two 

 series, one being much longer than the other, club-shaped, larger at the top than the 

 bottom, and ending abruptly ; twenty-five longitudinal raised lines are placed at re- 

 gular intervals round the body, the top of each produced into a wart at the edge of the 

 disk, giving the margin a scalloped appearance ; the length of the longest tentacula 

 about half the diameter of the disk, the shorter ones a third of the length of the 

 longer ones ; all the tentacula are retractile : skin warty : ground-colour straw, or 

 yellowish pink, profusely covered with innumerable small, puce-coloured specks, 

 which become scarcer towards the apex, and where they form five or six circles ; the 



