108 HYMENOPTERA. 



portion, is a short blunt tooth, and on the attenuated middle portion is a longish 

 curved tooth. Abdominal segments sparsely punctured, except at the extreme base 

 and apex. Pygidial area shining, irregularly reticulated, narrowed towards the apex, 

 which is almost truncated. Incision in the hypopygium reaching to the base. The 

 third antennal joint is one third longer than the fourth ; the fourth and fifth joints are 

 subequal ; the basal six joints are reddish beneath. The inner orbits of the eyes, the 

 antennal keel (which is stout), two lines on the collar, a small round mark on either 

 side of the scutellum, an interrupted line on the metanotum, and two elongated broad 

 marks on either side of the median segment are yellow. There are three rounded marks 

 on the apex of the basal part of the petiole, and there is a line in its centre beneath ; 

 the apex of the petiole and the other segments at the apex are yellow ; there is a 

 brick-red band in front of the yellow apex of the petiole, and the third and following 

 segments are dull ferruginous. A line on the base of the femora and tibiae in front 

 and the metatarsus, spurs, and spines are white. The male has the clypeus flatly 

 convex, the apex transverse in the middle ; and the pygidial area shining, sparsely 

 punctured. 



The four specimens received do not show any variation in colour. Like C. simulans, 

 the species bears a marked resemblance to a Polybia. 



B. Second abdominal segment not cam/panulate. 

 i. Petiole elongate, distinctly longer than broad. 



7 2. Cerceris simulans. 



Cerceris simulans, Saussure, Reise d. Novara, Hymen, p. 87, t. 4. f. 53 (<J)\ 

 Hab. Mexico, temperate region 1 . 



v 3. Cerceris montezuma. 



Clypei media pars convexa, apice producta ; oculorum margines interni fere parallel! ; segmenti mediani area 

 cordiformis punctata ; nigra, metanoto abdominisque basi flavis ; alis fere hyalinis, antice fumatis, stig- 

 mate ochraceo. $ . 



Long, fere 11 millim. 



Hab. Mexico (coll. Saussure). 



Eyes slightly converging beneath. Head coarsely punctured ; the face covered 

 thickly with silvery, the front and vertex more sparsely with long fuscous, hair. Ocelli 

 separated from the eyes by more than the length of the third antennal joint and from 

 each other by the length of the fourth. Clypeus sharply convex in the middle, the 

 convex part narrow, and becoming slightly narrowed towards the apex, which forms a 

 projecting snout; the extreme apex below the snout bidentate. Antennae covered 

 with a close pile; the first joint as long as the second and third united; the third more 

 than twice the length of the second, the fourth hardly twice its length. Mesonotum 



