>f ' Fossorial llymenoptera. 411 



fifth segments, their basal margins black ; beneath black, 

 with the margins ferruginous. Wings fusco-ferruginous. 

 Hab. Mexico. 



Cerceris multipicta. 



Female. Length 9i lines. Black, variegated with yellow 

 and ferruginous ; the abdomen with a large yellow macula on 

 each segment laterally. Head : the clypeus with the anterior 

 margin deeply sinuated and, as well as the sides of the face 

 a little higher than the insertion of the antennas, and also a 

 large spot behind the eyes, pale yellow ; antennas ferruginous, 

 with the scape yellow in front, and five or six of the apical 

 joints black ; the cheeks and mandibles ferruginous, the latter 

 black at their tips. Thorax : the prothorax above, two spots 

 on the postscutellum, the metathorax, and the triangular space 

 in the centre of its base yellow ; a longitudinal black line 

 down the centre of the metathorax, and a narrower one down 

 the triangular space ; the legs, and a large patch at the sides 

 of the thorax beneath the wings, ferruginous ; the anterior tibiae 

 and the femora spotted with yellow ; wings flavo-hyaline, with 

 a dark cloud at their apex, their nervures and tegulas ferru- 

 ginous. Abdomen : the basal segment oblong, with the sides, 

 as well as the apical margin, yellow. 



Male. This sex is smaller, is similarly coloured, but it has 

 the clypeus rounded anteriorly. 



Hab. Angola (Lower Guinea) . 



Dr. Gerstacker has described a species of this genus, Cerceris 

 pictiventris, in Peters's 'Naturw. Reise nach Mossambique,' 

 a figure of which is given in Taf. xxx. fig. 12 (<J). It re- 

 sembles the present species — but differs from it in being only 

 5 lines in length, in having the head and thorax differently 

 coloured, in being smooth and shining, with rather distant 

 punctures, in having the basal segment of the abdomen nearly 

 as broad as long, and in having the triangular space at the 

 base of the metathorax divergently grooved ; in the present 

 species it is glassy smooth and shining in both sexes. 



Cerceris fervens. 



Female. Length 4 lines. Black, strongly and closely 

 punctured, variegated with yellow, and with yellow legs. 

 Head : the mandibles, face, clypeus, and scape of the antennas 

 yellow. Thorax : an interrupted line on the collar, two on 

 the scutellum, the postscutellum, a large ovate spot on each 

 side of the metathorax, and a spot beneath the wings yellow ; 

 the posterior femora and tibias fuscous at their apex within ; 

 wings subhyaline and iridescent, the anterior pair slightly 



