218 HYMENOPTERA. 



Crocisa graliami sp. nov. 



9 . Length 9h mm. ; scutellum W-like, all black, but white hair 

 projecting from beneath the emargination ; markings pale blue ; wings 

 very dark, violaceous with hyaline spots ; face with bluish-white hair, 

 the lower part of clypeus bare ; lower half of pleura abruptly bare ; 

 more than the basal half of hind tibia light haired. The light markings 

 on the thorax are of the usual pattern, with a broken band in front, a 

 short anterior median longitudinal band (separated from anterior mar- 

 gin), a spot on each side of the last, a pair of lateral longitudinal 

 bands, which are short and do not connect with the two large spots 

 just anterior to the scutellum. The abdominal markings consist of 

 broadly interrupted (squarely cut off) bands, and on the first segment 

 a large lateral mark on each side, broadly emarginate or excavated 

 within, its lower lobe representing the bands on the other segments. 



Related to C. lanosa Friese, but not long-pilose. The ab- 

 dominal markings are as in the much larger C. guineensis. 



Hab. — Obuasi, Ashanti, Africa {Graham). Cambridge 

 University Museum. 



Ceratina (Ceratinidia) ridleyi sp. nov. 



Length about 10 mm., black with light yellow markings; wings 

 reddish dusky. 



d 1 . Head and thorax shining, antenna? inserted in a wide basin, 

 which is bounded by a strong ridge below and at sides, the lateral 

 ridges contiguous with the eyes ; face below antennae yellow, except a 

 black stripe down each side of the square upper half of the clypeus, 

 and narrowly along the upper edge of clypeus, and the supraclypeal 

 area black except a broad transversely oblong mark just above the 

 clypeus ; labrum yellow with two dark spots, and strong sparse punc- 

 tures ; mandibles yellow with the tridentate apex black ; cheeks yel- 

 low ; antennal basin divided in the middle by a longitudinal keel ; 

 a pair of yellow spots, almost touching, below the anterior ocellus; a 

 pair of elongate yellow marks on upper side of head ; antennae pice- 

 ous, scape yellow in front, flagellum thick, last joint somewhat pointed ; 

 mesothorax with the anterior half roughened and punctate, the poste- 

 rior smooth and shining; the yellow markings of thorax consist of four 

 stripes (the middle ones narrow) on mesothorax, prothorax above, 

 and descending stripes, most of tubercles, mesopleura except posterior 

 margin (broader above), scutellum, axilla?, band on postscutellum, 

 and base of metathorax very broadly; femora, tibia? and tarsi yellow, 

 but the middle femora suffused with blackish, and the hind ones with 

 rather more dark than light ; inner side of hind tarsi with pale golden 

 hair; tegulae shining rufotestaceous ; wings hairy, nervures and stigma 

 dark reddish ; abdomen shining basally, rugose apically, second and 

 third segments distinctly but spasely punctured ; first segment with 



