11j6 htmenopteea. 



The male has the clypeus convex, but not largely so, rounded at the apex, the 

 extreme middle of the apex with a small projection, apparently incised ; rugosely 

 punctured. Pygidial area finely and irregularly punctured. The clypeal projections, 

 the antennal tubercle, the scutellum entirely, the metanotum, two oblique marks on 

 the middle of the median segment and a small irregular mark on the side, the greater 

 part of the petiole, an interrupted band on the second segment, a well-marked one on 

 the fourth, a narrower one on the fifth, and a still narrower one on the sixth, yellow. 

 Legs as in the female. 



y 



12. Cerceris otomia. (Tab. VII. fig. 10, $ .) 



Cerceris otomia, Saussure, Reise d. Novara, Hymen, p. 99 (c? ? ) l . 



Hab. Mexico, Zinapecuaro in Michoacan (Saussure 1 ), Eastern Cordillera (Sumi- 

 chrast x ), Mexico city, Atoyac and Fortin in Vera Cruz (H. H. Smith). 



The triangular snout-shape of the clypeus, obliquely truncated beneath (the truncation 

 is white), distinguishes this species. C. marginata has the centre of the clypeus 

 similar in form, but much narrower, while the body is entirely black, without any 

 markings whatever. 



v 13. Cerceris flavida. 



Long. 7 millim. 



Hab. Mexico, Cordova (coll. Saussure). 



Eyes slightly diverging beneath. Hinder ocelli separated from the eyes by the length 

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

 fourth. Third antennal joint twice the length of, the fourth hardly one half longer 

 than, the second. Clypeus in the middle sharply convex ; the convex portion trian- 

 gular, gradually (but slightly) produced to the apex, from which it slopes down obliquely. 

 Punctuation of the head moderate ; there is a transverse depression behind the ocelli ; 

 the hair is longish and griseous. Punctuation of the mesonotum and median segment 

 weaker and more scattered than on the head ; the mesopleurae coarsely rugose ; the 

 heart-shaped area of the median segment impunctate, with a crenulated furrow down 

 its centre ; the pleurse densely covered with long griseous hair. Abdomen shining ; the 

 punctuation as on the mesonotum; the petiole as long as broad; pygidial area 

 elongate, narrowed at the base and apex, the surface rough ; lateral hair-fringe pale, 

 moderate ; incision in the hypopygium short, not reaching to the middle, the hypo- 

 pygium finely and closely punctured. The face (except the oblique lower part of the 

 clypeus), an interrupted line on the pronotum, the tegulse, the metanotum, a line on 

 all the abdominal segments (except the last), two lines on the third and fourth ventral 

 segments, the apex of the femora, and the tibiae and tarsi, yellow ; the apex of the 



