112 HYMENOPTEEA. 



incision. The third joint of the antennae not one quarter longer than the fourth, 

 which is nearly equal in length to the fifth ; the flagellum more or less rufous beneath. 

 The vertex sparsely, the face and cheeks densely, covered with silvery or golden hair, 

 and coarsely punctured. Thorax coarsely punctured, almost as strongly as the head ; 

 the median segment, as usual, having the punctures larger and more widely separated ; 

 the heart-shaped area of the median segment aciculate, channelled in the middle. 

 Median segment short, abruptly rounded, almost perpendicular at the apex. Petiole 

 wider than long, bearing large widely separated punctures, shining ; the other abdo- 

 minal segments more opaque, densely covered with a silvery pile, and hardly so strongly 

 punctured as the thorax. Pygidial area rugose, narrowed and rounded at the apex; 

 the outer margin fringed with long stout hairs, which form brushes. Penultimate 

 ventral segment depressed largely in the centre ; the apex raised and projecting in the 

 middle; the incision in the hypopygium very short. A line on either side of the 

 pronotum, the metanotum in the middle, and the third, fourth, and fifth abdominal 

 segments broadly at the apex, fulvous-yellow ; the apical segment rufous, blackish at 

 the apex, the sides yellow. The legs densely covered with silvery pile; the tibiae 

 white in front, the spines being also white. 



The male has the inner orbits broadly, the clypeus (more or less), a curved mark 

 behind the ocelli and a smaller one behind the eye near the top, a mark on either side 

 of the scutellum, the metanotum (more or less), and two small marks on the apex of 

 the petiole, yellow ; and the bands on the abdominal segments are broader and of a 

 clearer yellow, the fulvous colour being almost absent. The fore tibiae and tarsi are 

 for the greater part yellow ; the sculpture is stronger and coarser than in the female ; 

 the clypeus slightly gapes and is roundly incised ; the pygidial area is covered with 

 long white hair ; and the wings are hardly so yellow, in some specimens having a 

 fuscous tinge, especially along the fore margin. The relative lengths of the antennal 

 joints are as in the female. Length 9-12 millim. 



b. Clypeus ( $ ) convex, nose-shaped, narrowed towards the apex, not free in the centre, 

 the apex obliquely truncated ; the thorax marked largely with yellow. 



7. Cerceris aureo-facialis. 



Nigra, gense, lineis pronoti, tegulis, metanoto, abdominis segmentisque 2°-6 m late, flavis ; alis flavo-hyalinis, 



antice fumatis, stigmate ochraceo ; area cordiformis striolata. 

 Long. 9 millim. 



Hah. Mexico, Orizaba [E. H. Smith). 



& . Eyes almost parallel. Hinder ocelli separated from the eyes by somewhat more 

 than the length of the third and from each other by the length of the fourth antennal 

 joint. Head rather strongly punctured ; clypeus broadly triangularly convex in the 

 middle, and, like the cheeks, densely covered with golden, the vertex and front with 



