142 HTMENOPTERA. 



Abdomen at base not rugosely punctured. 



Abdomen banded with yellow. [centralis, ariel. 



The base punctured sonorensis, montivagus, 



' The base impunctate hector, costaricensis. 



Abdomen black. 



Thorax rugose constanceae. 



Thorax impunctate guerrerensis, yucatanen- 



sis, montezuma. 

 Apical abdominal segment not acutely pointed or grooved, not 



curved; <$ fore tibise expanded (—Thyreopus, St.-Farg.) . . alpestris,alticola,peltista. 



Abdomen petiolate, the petiole nodate at the apex fulvo-hirtus, maculi- 



tarsis,jason. 



y l. Crabro saxatilis. (Tab. IX. fig. l, $ .) 



Niger, crebre punctatus ; abdominis segmentis 2°-6 m , femoribus, tibiis tarsisque anticis flavis ; petiolo crebre 



punctato ; alis fere hyalinis. $ . 

 Long. 7 millim. 



Hah. Mexico, Atoyac in Vera Cruz (H. H. Smith), Temax in North Yucatan (Gaumer). 



Front shallowly excavated, shining, impunctate, the sides and apex aciculated, the 

 central furrow fine. Head closely and rather strongly rugosely punctured. Ocelli 

 forming a curve, separated from each other by the same distance they are from the 

 eyes — by the length of the second and third antennal joints united. Clypeus rather 

 sharply keeled in the middle. Third antennal joint twice the length of the second, 

 and longer than the fourth. Pronotum short, almost transverse, the edges ending in a 

 sharp tooth-like point ; propleurae deeply excavated, shining, irregularly striolate. 

 Mesothorax and scutellum coarsely and strongly rugosely punctured ; base of the 

 median segment rugosely punctured, the apex coarsely transversely striolated ; meta- 

 pleurse not deeply excavated, aciculated, and obliquely striated. Basal segment of the 

 abdomen coarsely rugosely punctured, with a belt of much finer and closer punctuation 

 at the apex ; the second segment in the middle and at the base punctured, but not 

 strongly ; the third segment still less strongly punctured ; the other segments acicu- 

 lated, with some fine punctures at the base and middle. Pygidial area punctured, 

 the apex bluntly rounded. Legs covered with a pale silvery pubescence ; the hind 

 tibise with short stout bristles. The long spur of the hind tibiae is about one-third of 

 the length of the metatarsus and a little longer than the second and third joints 

 united. The wings vary in tint — from almost hyaline to fulvous-smoky ; the stigma 

 is dark testaceous. 



\ 4 2. Crabro champion! (Tab. IX. fig. 2, 5 .) 



Niger, hirsutus, abdomine punctato ; metanoto abdominisque maculis 8 flavis ; alis fere hyalinis, stigmate 



nigro. $ . 

 Long. 9 millim. 



Hah. Guatemala, Las Mercedes 3000 feet (Champion). 



