282 HYMENOPTERA. 



the apex ; the sides there depressed. Abdomen closely punctured, scarcely so strongly 

 as the thorax ; there is an obscure black mark on the apex of the first segment ; the 

 second and third segments are black along the sides ; the fourth at the apical half and 

 the remaining segments black. The abdomen is long and slender, the first segment 

 ilattish above, the apical one nearly cylindrical ; in the middle it is testaceous. Legs 

 long, slender; the hinder pair fulvous, the anterior pair yellowish; tips of the tarsi 

 blackish. Areolet large, the lateral nervures a little curved and united above ; below 

 it is but very slightly angled where the recurrent nervure is received not far from 

 the base. 



The eyes are large, and reach nearly to the base of the mandibles ; the cheeks do not 

 project much. The metanotum is fulvous ; the yellow colour runs more or less into 

 fulvous all over the body. 



A specimen from Orizaba (Bilimek) has the abdomen black with the segments yellow 

 at the base and apex, the metanotum blackish in the middle at the apex, and the whole 

 body and legs of a much more decided fulvous tinge. It appears to be an aberration 

 of M. mexicanus. 



5. Mesoleptus bardus. 



Mesoleptus bardus, Cresson, Trans. Am. Ent. Soc. 1868, p. 34 [$) '. 



Hab. Mexico, Hacienda del Potrero, near Cordova x (Sumichrast). 



6. Mesoleptus imbecillis. 



Mesoleptus imbecillis. Cresson, Trans. Am. Ent. Soc. 1868, p. 34 (tf) 1 . 



Hab. Mexico, Hacienda del Potrero, near Cordova l (Sumichrast). 



7. Mesoleptus emaceratus. 



Mesoleptus emaceratus, Cresson, Trans. Am. Ent. Soc. 1868, p. 35 (tf) 1 . 

 Hab. Mexico, Hacienda del Potrero, near Cordova 1 (Sumichrast). 



8. Mesoleptus decorosus. 



Mesoleptus decorosus, Cresson, Trans. Am. Ent. Soc. 1868, p. 35 (tf) 1 . 

 Hab. Mexico, Hacienda del Potrero, near Cordova 1 (Sumichrast). 



9. Mesoleptus alpestris. (Tab. XI. fig. 24.) 



Niger; ore, palpis, facie, orbitis, linea pronoti, pleuris, sterno, lineis 2 mesonoti, scutello coxisque, flavis; 



pedibus fulvis ; alis hyalinis, stigmate testaceo. $ . 

 Long. 13 millim. 



Hab. Mexico, Ciudad in Durango 8100 feet (Forrer). 



Antennae stoutish, the middle joints produced at the apices; in length as long as the 

 body. Head closely punctured, projecting in the centre in front, the cheeks not 



