118 HYMENOPTERA. 



16. Cerceris huastecae. (Tab. VII. figg. 13, head, $ ; 13 «, clypeal plates.) 

 Cerceris huastecae, Saussure, Reise d. Novara, Hymen, p. 102, t. 4. fig. 60 ( ? )\ 



Hab. Mexico, Chilpancingo in Guerrero 4600 feet (H. H. Smith), Tampico K 



17. Cerceris Semipetiolata. (Tab. VII. figg. 14, head, $ ; 14 a, clypeal plates ; 

 14 b, pygidium ; 14 c, hypopygium.) 



Cerceris semipetiolata, Saussure, Reise d. Novara, Hymen, p. 88 ( $ ) \ 



Hab. Mexico, Orizaba *, Cordova (coll. Saussure). 



The clypeus in the female is broadly and roundly convex ; the apex sharply oblique, 

 and bearing two leaf-like expansions as in C. mexicana; the eyes are parallel; the 

 hinder ocelli are separated from the eyes by the length of the third antennal joint, and 

 from each other by less than the length of the fourth joint; the head is coarsely 

 punctured ; the clypeus and cheeks are densely covered with silvery hair ; the petiole 

 is slightly shorter than in the male, but still longer than broad ; the pygidial area is 

 not narrowed at the base, and but slightly so towards the apex ; the surface is trans- 

 versely rugose ; the incision in the hypopygium does not reach to the middle, and is 

 somewhat longer than wide. The cheeks in the middle are pale yellow ; the clypeal 

 plates being also of this colour. 



The clypeus in the male is broadly convex in the middle ; the apex is transverse, with 

 a very small tooth in the centre. In both sexes the antennae are rufous beneath, the 

 apical joint being entirely rufous. 



In having the apex of the middle part of the clypeus divided into two leaf-like 

 expansions, this species agrees with C. mexicana and C. huastecae ; but the clypeus is 

 more roundly convex, the apex, too, being more sharply oblique so as to be almost 

 hidden when looked at directly from the front ; the petiole, also,*is longer. 



v 18. Cerceris zapoteca. 



Cerceris zapoteca, Saussure, Reise d. Novara, Hymen, p. 89 (<$)\ 

 Hab. Mexico, Tampico 1 . 



d. Clypeus ( $ ) raised in the centre, usually flat, but not or hardly free from the sides. 



19> Cerceris Obsoleta. (Tab. VII. figg. 15, 2 ; 15 a, pygidium ; 15*, hypopy- 

 gium.) 



Clypei pars media convexa, margine apicali leviter emarginato; oculorum margines fere paralleli; area 

 cordiformis lseva, margine laterali foveato ; nigra, maculis duabus scutelli, metanoto, apice abdominisque 

 1° et 3° segmentis, flavis ; alis fortiter fumatis. 5 . 



Long. 9-10 millim. 



Hab. Mexico, Teapa in Tabasco (H. H. Smith). 



Jives parallel. Ocelli not forming a triangle, and separated from the eyes by fully the 



