of Fossorial Hymenoptercu 107 



the nervures fusco-ferruginous. Abdomen : the apical margins 

 of the segments yellow. The insect covered with confluent 

 punctures. 

 Hob. Para. 



The colour of this species will probably be found to vary in 

 being more or less red, and also in the amount of pure yellow 

 with which it is variegated. It is unique in the National 

 Collection. 



Cerceris ruficeps. 



Female. Length 4^ lines. Head red, with the face and 

 clypeus yellow ; thorax and abdomen black, and spotted and 

 banded with yellow. Head : the scape yellow in front, fer- 

 ruginous behind ; the four basal joints of the flagellum ferru- 

 ginous, the following are only so beneath ; the mandibles 

 ferruginous, with their apex black ; a large black spot on the 

 vertex, enclosing the ocelli. Thorax : the collar, two spots 

 spots beneath the wings, the tegulee, a minute spot on each 

 of the scutellum, and the postscutellum yellow, and more 

 or less tinged with ferruginous ; wings fusco-hyaline and iri- 

 descent ; the costal nervures and the stigma pale ferruginous, 

 the rest of the nervures dark fuscous ; the legs ferruginous and 

 more or less variegated with yellow ; the posterior tibiae and 

 femora blackish within. Abdomen : a broad yellow margin 

 on the basal segment, edged with ferruginous ; the second and 

 fifth segments with a narrow white fascia near their apical 

 margins. The insect covered with confluent punctures. 



Hob. St. Paulo. 



Genus Teachypus, Klug. 



Trachypus disjunctus. 



Male. Length 5| lines. Black, variegated with yellow and 

 white. Head shining on the vertex, which is covered with 

 large confluent punctures ; the face more closely and finely 

 punctured, and covered with silvery pubescence ; the clypeus 

 and cheeks with long fulvous pubescence ; the scape in front, 

 and a very narrow line at the inner margins of the eyes, yellow ; 

 six or eight of the basal joints of the flagellum yellowish 

 beneath ; tips of the mandibles rufo-piceous. Thorax shining j 

 the mesothorax with three deep longitudinal furrows, which 

 have a short impressed line between them and the tegulse ; 

 the scutellum, postscutellum, and an enclosed space at the base 

 of the metathorax smooth and shining ; the latter has a small 

 pit in the middle ; beyond, the metathorax is punctured ; wings 



