of Fossorial Hymenoptera. 105 



triangle ; the scape in front and the mandibles yellow, the 

 latter ferruginous at their apex ; the flagellum fulvous beneath ; 

 the palpi pale testaceous ; the lower part of the face and the 

 clypeus covered with bright silvery pubescence. Thorax : the 

 collar, tubercles, anterior and intermediate tibiae and tarsi, and 

 all the femora at their apex yellow ; the posterior tibiae spinose 

 externally, and their calcaria pale ferruginous ; the wings 

 hyaline and iridescent, with their nervures fuscous ; the tegulae 

 testaceous ; two yellow spots on the scutellum, and also two 

 on the postscutellum. Abdomen shining, and thinly covered 

 with a fine, pale, sericeous pile. 

 Hab. St. Paulo (Brazil). 



Family Philanthidae. 



Genus Cerceris, Latr. 

 Cerceris reversus. 



Male. Length 3| lines. Black, with yellow spots and bands 

 above ; beneath yellow, with black markings. Head : the 

 face, clypeus, mandibles at their base, and the scape of the 

 antennae in front yellow ; the flagellum fulvous beneath. 

 Thorax : an interrupted line on the collar, the tegulae, scu- 

 tellum, postscutellum, and the metathorax yellow ; the latter 

 with an abbreviated black line that runs halfway up from its 

 base ; and at its base a minute triangular black space, with a 

 yellow dot in the middle ; wings subhyaline, iridescent, and 

 with a fuscous stain along the anterior margin of the fore 

 wings ; the legs are yellow beneath, except the posterior 

 femora, which are only so at their base ; an irregular-shaped 

 yellow spot in the middle of the pectus ; the anterior and in- 

 termediate tarsi yellow, the posterior pair fuscous. Abdomen : 

 the first segment, a line on the posterior margin of the second 

 laterally, and an entire fascia on that of the four following 

 segments, with the seventh entirely, yellow ; beneath yellow, 

 with narrower black fasciae. 



Hab. Para. 



Cerceris pullatus. 



Female. Length 4-^ lines. Black ; the wings fuscous ; the 

 legs varied with yellow. Head : the sides of the face, below 

 the insertion of the antennae, yellow • the clypeus black, its 

 anterior margin slightly emarginate, and produced at the angles 

 into a short acute tooth ; the lower part of the face, on each 

 side of the clypeus, with a bright silvery pubescence ; the 

 scape, and two basal joints of the antennae, and the underside 



