Manchester Memoirs, Vol. xlii. (1898), No. 1. 43 



Aphaenogaster antarcticus Sm. 

 Two females. 



FOSSORES. 

 Crabro (Rhopalum) JOCOSUS, Sp. nov. 



Long. 8-9 mm. 



Comes near to C. perforator Sm. ; differs in having 

 less yellow on the legs and none on the mesonotum. 



Head black ; the cheeks and clypeus densely covered 

 with silvery pubescence ; the front and vertex alutaceous, 

 sparsely covered with microscopic down ; the ocelli • . * ; 

 the vertex depressed in the centre, where there is a furrow 

 running down from the ocelli ; close to the eyes on the 

 inner side, nearly opposite the lower ocellus, is a short, 

 moderately deep, curved depression. Antennae black ; the 

 basal joints of the flagellum testaceous beneath ; the third 

 joint slightly, the fourth largely, produced beneath ; the 

 sixth deeply incised at the base, the apex largely dilated ; 

 the fifth joint ovate. The mandibles piceous before the 

 teeth ; there is one large apical and a shorter basal tooth. 

 Pronotum at the middle distinctly separated from the 

 mesothorax ; in the centre above broadly hollowed, the 

 sides behind depressed, the middle raised, rounded ; the 

 edge of the pronotum near the tegulae white. Mesonotum 

 and scutellum shining, impunctate, glabrous ; a deep, large, 

 oval depression at the side of the post-scutellum. Down 

 the centre of the median segment is a deep, moderately 

 wide furrow. At the base of the mesopleurae an oblique, 

 wide, crenulated furrow ; in the centre above a small 

 round depression ; the metapleurai are broadly depressed 

 at the base. Legs black ; the base of the fore femora, the 

 fore tibiae except a black line behind, the fore tarsi, the 

 apex of the middle femora, the middle tibiae except behind, 

 the middle tarsi except the apical joint and the second 



