ofFossorial Hymenoptera. 409 



the apex of the tibice and a line on the inside of the femora 

 fuscous. Abdomen : the first segment entirely yellow, and 

 the apical margins of the other segments with a narrow yellow 

 band ; the second segment ferruginous above at the base, and 

 entirely ferruginous beneath. 

 Hob. Para. 



Family Philanthidae. 



Genus Cerceris, Latr. 



Cerceris striata. 



Female. Length 4 lines. Black, with yellow markings ; 

 the mesothorax longitudinally striated. Head : the clypeus 

 slightly elevated and bidentate at its apex ; the clypeus, sides 

 of the face, scape in front, and the mandibles yellow, the latter 

 black at their tips ; four or five of the joints at the base of the 

 flagellum beneath, and the apical joint entirely, ferruginous. 

 Thorax : the posterior margin of the prothorax transverse, 

 raised, and forming acute lateral angles, yellow, as are also 

 the tubercles, the scutellum, and a line at the sides of the 

 metathorax, which is continuous outside the triangular space 

 at the base of the metathorax ; the legs rufo-piceous behind, 

 and yellow in front ; wings hyaline and iridescent, with a 

 fuscous stain in the marginal cell which extends to the apex of 

 the wing. Abdomen : the first segment yellow, except its 

 extreme base and apex ; the second yellowish at the base ; the 

 third with a yellow fascia at its apical margin, the third and 

 fourth with very narrow fasciae ; beneath rufo-testaceous, with 

 the three basal segments more or less yellowish. 



Hah. Para. 



Cerceris rostrata. 



Female. Length 6 lines. Yellow, with black markings ; 

 the clypeus elevated and narrowed at half its length to a point. 

 Head : the vertex black, with a black line running to the base 

 of each antenna ; two oblique yellow lines converge inwardly 

 from the eyes and meet (or nearly so) at the margin of the 

 vertex ; an ovate black spot on each side of the head ; the 

 antennas ferruginous and more or less fuscous above. Thorax : 

 the prothorax black above, with its posterior margin yellow ; 

 the mesothorax black above, its lateral margins yellow, and 

 three sides of a square traced in yellow on the disk ; a black 

 spot in the middle of the scutellum ; the triangular space at 

 the base of the metathorax with a black line in the centre, on 

 each side of it a black line runs halfway down the metathorax ; 

 the tibiae and tarsi with a narrow black line above ; wings 



