CEECEEIS. 123 



with a sharp edge ; third antennal joint fully one quarter longer than the fourth. On 

 the top of the head the punctuation is moderately strong ; the face and clypeus is more 

 finely punctured and coarsely aciculate. Punctuation of the mesonotum coarse and 

 running into reticulations; on the pleurae the punctures are more widely separated, 

 still more so on the median segment, where they are also larger. The heart-shaped area 

 impunctate, the sides foveolate-striolate. Median segment with a rather abrupt slope. 

 The oblique furrow on the mesopleura is wide and deep. Abdomen longer than the 

 head and thorax united. Petiole somewhat longer than wide, shining, and bearing 

 widely separated punctures ; the punctuation of the other segments strong at the base, 

 becoming gradually weaker towards the apex. Pygidial area coarsely rugose, opaque ; 

 the lateral hair-fringe dense, longish, stout, and rufous ; the apex rounded. Penulti- 

 mate and antepenultimate ventral segments densely covered with long, close, fulvous, 

 soft hair ; the bristles on the last segment long, dense, and fulvous. The inner orbits 

 of the eyes broadly, the clypeus (except the apical tips), a mark behind the eyes, two 

 lines on the pronotum, a mark on either side of the scutellum, the metanotum, a broad, 

 elongate mark on the side of the median segment extending nearly from the base to 

 the apex, the sides (broadly) and the apex of the petiole^ a narrow line on the second 

 abdominal segment, a broader one on the third, and the greater part of the fourth and 

 fifth segments, yellow. The anterior and middle tibiae and tarsi (except an irregular 

 black line on the former behind) and the knees rufo-testaceous ; the hinder tarsi 

 obscure testaceous at the base and apex. Spurs and spines fulvo-testaceous. 



An example from Temax, Yutacan (Gaumer), has the marks on the median segment 

 much reduced, only commencing at the middle, and the petiole and the third segment 

 only marked with yellow ; the projecting middle of the clypeus appears shorter and has 

 the incision shallower; the head looks smaller; the antennae are not rufous at the 

 base ; and the four front tibiae and tarsi are fuscous-black. Our figures 21d-21f are 

 taken from this specimen. 



25. Cerceris exsecta. 



Cerceris exsecta, Smith, Ann. & Mag. Nat. Hist. 4th ser. xii. p. 410 \ 



Hdb. Mexico 1 . 



This agrees so closely with C. imperialis in coloration and in the form of the clypeus 

 that I have no doubt the two will prove to be conspecific. G. imjperialis, it may be 

 added, shows considerable variation in the colour of the legs and abdomen. 



26. Cerceris esau. (Tab. VIII. figg. 1, head 1 a, apex of clypeus, 1 b, pygi- 

 dium, 1 c, hypopygium, 6 .) 



Cerceris esau, Schletterer, Zool. Jahrb. ii. p. 458 x . 



Hdb. Mexico, Cuautla 1 . 



rr 2 



