CEECEEIS. 119 



length of the second and third antennal joints united, and from each other by the length 

 of the third. Clypeus broadly convex, projecting, and narrowed towards the apex, the 

 apex with a rounded shallow incision, the sides rounded. Antennal tubercle acutely 

 pointed, wider towards the apex. Punctuation of the head coarse, especially on the 

 vertex ; the hair on the vertex longish and sparse ; the pubescence on the face and oral 

 region close and silvery. Third antennal joint hardly one quarter longer than the 

 fourth, and shorter than the first. Thorax very coarsely punctured ; the oblique 

 furrow on the mesonotum obsolete ; the heart-shaped area of the median segment not 

 defined, except by six large oblong foveee, which are only separated from the punctures 

 of the median segment itself by their larger size. Median segment with a gradually 

 rounded slope, without a clearly-defined furrow, and the punctures on it much larger 

 than those on the mesonotum. Abdomen strongly punctured throughout ; the petiole 

 much wider than long. Pygidial area rugosely punctured, particularly at the base, 

 wider at the apex than at the base, the latter transverse, the former roundly projecting 

 in the middle ; the sides have large, widely separated punctures. The incision in the 

 apical ventral segment is narrowed, reaches to near the basal third of the segment, and 

 is rounded at the base ; the lateral teeth are stout. The flagellum is reddish-fulvous 

 beneath ; the inner orbits of the eyes, two lines on the pronotum, a mark on either 

 side of the scutellum, the metanotum, a band on the petiole, and another on the apex 

 of the third segment, yellow. The femora, tibiae, and tarsi are obscure fuscous-yellow 

 in front. 



20. Cerceris montivaga. (Tab. vil. fig. 16, $ .) 



Hab. Mexico, Chilpancingo in Guerrero 4600 feet (H. H. Smith). 



Closely related to 6. obsoleta, but smaller (7 millim.) ; the central part of the clypeus 

 is broader, flatter, and not so much narrowed towards the apex ; the clypeus and cheeks 

 are densely covered with silvery pubescence, which hides the surface completely; the scape 

 is clear yellow beneath ; the punctuation of the head is much closer ; the heart-shaped 

 area of the median segment is aciculate and wants the fovea? ; the pygidial area is longer 

 and narrower, and not narrowed at the base ; the incision in the hypopygium is very 

 much shorter, this being not much longer than broad ; the second segment is broadly 

 yellow, the third segment without yellow, and the fourth narrowly lined with it. In 

 other respects agreeing with C. obsoleta. 



v 21. Cerceris Smithiana. (Tab. VII. figg. 17,$; 17 a, head; 17 6, clypeus; 

 17 c, pygidium ; 17 d, hypopygium.) 



Long. 8 millim. 



Hab. Mexico, Atoyac in Vera Cruz (E. E. Smith). 



2 . Eyes a little converging beneath. Hinder ocelli separated from the eyes by nearly the 



