CEECERIS. 109 



coarsely longitudinally punctured ; median segment with the punctures larger, deeper, 

 and more clearly separated; the heart-shaped area finely and closely punctured, 

 furrowed down the centre. Pleurse coarsely punctured ; the hollow below the point 

 of insertion of the hind wings finely striated. The thorax bearing long hair, fuscous 

 above, paler on the pleura?. Abdomen elongate; the petiole distinctly longer than 

 broad; shining, sparsely punctured; the abdominal segments punctured like the 

 median segment at the base, but with the punctures more widely apart ; the apical 

 segments with the punctures finer. Pygidial area elongate, the extreme base 

 narrowed, the apex rounded, the surface irregularly transversely striated ; the extreme 

 apex depressed ; the lateral hair-fringe thick, pale. Incision in the terminal ventral 

 segment very short, rounded at the base, not much longer than broad, about one 

 fourth of the length of the segment, which is closely punctured and depressed in the 

 centre ; the other segments finely punctured ; the third, fourth, and fifth closely covered 

 with dark fulvous hair. The femora bear longish pale hair ; the tibiae and tarsi are 

 closely covered with silver pile. Cubitus elongate; the recurrent nervure received 

 shortly before the middle. The only coloured parts are the metanotum, the sides 

 and apex of the petiole, a narrow line on the sides of the second segment, the petiole 

 beneath, and two spots on the apex of the second ventral segment. 



This is a narrower and more elongate species than any other of the genus known from 

 our region. In the elongated petiole it agrees with C. semipetiolata ; but differs from 

 it in the form of the clypeus, in which it resembles the group of C. chiriquensis, the 

 clypeus, however, is narrower in the middle than in any species of that section. 



ii. Petiole not elongate, broader than long. 

 a. Clypeus ( $ ) simple, subconvex, the central region not separated from the lateral. 



^ 4. Cerceris tolteca. (Tab. VII. figg. 4, $; 4 a, clypeus; 4 5, pygidium ; 4c, 



hypopygium.) 



Cerceris tolteca, Saussure, Reise d. Novara, Hymen, p. 94 ( $ ? ) \ 



Hob. Mexico, Cuernavaca \ Chilpancingo and Tierra Colorada in Guerrero (H. H. 

 Smith), Temax in North Yucatan ( Gaumer). 



Eyes parallel. Ocelli not forming a triangle ; the posterior pair separated from the 

 eyes by nearly the length of the second and third antennal joints united, and from 

 each other by almost the length of the third joint. Clypeus flat, the apex slightly 

 gaping and with a semicircular incision in the middle. Antennal tubercle compressed, 

 sharply pointed, elongate, depressed at the base and apex. Head moderately strongly 

 punctured. The clypeus (except the sides, which are black), the inner orbits of the 

 eyes to near the top, a line above the antennal tubercles, two oblique marks behind 

 the ocelli and a larger mark behind the eyes, and the mandibles (except at the^apex), 



