CEECEEIS. 107 



CERCERIS. 



Cerceris, Latreille, Hist. Nat. Crust, et Ins. xiii. p. 315 (1804). 



I have arranged the species according to the form of the clypeus in the female ; and 

 have placed those of which we have no females nearest to the group to which they are 

 apparently most nearly related. 



A. Basal segment of the abdomen ovate, the second camjpanulate. 



1. Cerceris binodis. (Tab. VII. figg. 3, $ ; 3«, face; 3 6, face, lateral view; 

 3 c, pygidial area ; 3 d, hypopygium ; 3 e, male organ.) 

 Cerceris binodis, Spinola, Ann. Soc. Ent. Fr. x. p. 117, t. 3. f. 3 {£) l ; Smith, Cat. Hymen, iv. 



p. 464 2 . 

 Diamma spinolce, Dahlb. Hymen. Eur. i. p. 225. 

 Diesmus spinolce, Dahlb. loc. cit. p. 502 3 . 



Hab. Mexico, Acaguizotla in Guerrero (H. H. Smith), Cordova (coll. Saussure), 

 Valladolid in Yucatan (Gaumer); Guatemala, Sinanja in Vera Paz (Champion). — 

 South America, Cayenne 123 , Brazil 2 . 



The Central-American specimens do not agree quite in coloration with Spinola's 

 description, e. g. the eyes are not marked with yellow behind, the scutellum wants the 

 yellow marks, the abdomen is broadly rufous at the apex, and the legs are darker 

 coloured. Judging, too, by the figure, there is a difference in the shape of the second 

 cubital cellule. Under these circumstances, it is advisable to give a full description of 

 our insect : — 



Clypei media pars elevata, triangularis ; oculorum margines intend clypeum versus divergentes ; segmenti 

 mediani area cordiformis opaca ; abdominis segmento 1° petiolare ; nigra, segmento mediani maculis 

 duabus flavis, abdominis segmentis 5°-7 m rufo-fulvis ; alis fusco-hyalinis, antice fumato. $ . 



Long. 13-15 millim. 



Head moderately coarsely punctured, covered with rather long fuscous hair on the 

 top, the face with a longish silvery pubescence. Eyes slightly diverging beneath. 

 Ocelli hardly forming a triangle, separated from the eyes by rather more than the 

 length of the third antennal joint. Clypeus sharply snout-shaped in the middle, the 

 apex curved. Mandibles shining, grooved, aciculate at the base, bearing scattered 

 punctures, and piceous at the apex. Thorax coarsely punctured ; the mesopleurae at 

 the apex shining, impunctate, striolated above ; scutellum with the punctures fewer 

 and sparser; on the median segment the punctures are distinctly larger and deeper 

 than on the mesonotum, but more widely apart. The heart-shaped area of the median 

 segment obscurely aciculate, indistinctly keeled down the middle. Median segment 

 roundly curved. Petiole longer than broad ; slightly narrowed towards the apex ; the 

 base of the second segment narrow, petioliform, projecting at the apex of the narrowed 

 part, and becoming gradually widened from thence to the apex ; beneath, on the basal 



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