of Fossorial Hymenoptera. 101 



gellum of the antennas, as well as the mandibles, ferruginous. 

 Thorax smooth and shining, and more or less covered with 

 pale golden pubescence ; the mesothorax, the scutellum, and 

 metathorax usually destitute of pubescence ; a deep longitudinal 

 sulcation at the base of the metathorax, from which a groove 

 runs down to its apex ; wings flavo-hyaline, the nervures 

 ferruginous. Abdomen smooth and shining, with the petiole 

 more or less obscure at the base. 

 Hab. Ega. 



Trypoxylon Icevifrons. 



Female. Length 6| lines. Head and thorax black, and 

 adorned with golden pile. Coloured the same as rugifrons, 

 with these differences : the two apical joints of the antennae 

 ferruginous, and the petiole of the abdomen not discoloured. 

 The specific differences are, that the space below the anterior 

 stemma is covered with delicate shallow punctures, and it has 

 a central longitudinal channel which terminates in a slightly- 

 raised tubercle above the insertion of the antenna ; the meta- 

 thorax has no sulcation at its base, but has a central, broad, 

 slightly impressed channel, which runs from its apex upwards, 

 stopping short one third of its length before the base. 



Hab. Ega. 



Trypoxylon fabricator. 



Female. Length 5f lines. Black, smooth and shining, with 

 the basal margins of the second and third segments of the 

 abdomen rufo-testaceous. Head : the clypeus, lower part 

 of the cheeks, and the sinus of the eyes clothed with golden 

 pubescence ; the mandibles, base and apex of the scape, and 

 the first joint of the flagellum at its apex, and also beneath, 

 rufo-testaceous ; the defined space in front of the anterior 

 ocellus with a few irregular shallow punctures ; from its 

 anterior margin an elevated carina runs down to the insertion 

 of the antennas. Thorax : the margins of the pro- and meso- 

 thorax with golden pubescence ; the sides of the metathorax 

 have a paler pubescence ; at its base is a deep central sulcation, 

 which is indistinctly and transversely striated ; the oblique 

 truncation has a second broad groove, which runs to the apex ; 

 wings hyaline and iridescent, the nervures black ; the articu- 

 lations of the legs are pale ; the anterior tibia? and tarsi 

 palest ; the basal joint of the intermediate tarsi white at the base. 



The male closely resembles the other sex, but has the defined 

 space on the front rugose ; the legs are darker, and the trans- 

 verse striation on the metathorax is stronger. 



Hab. Ega; Catagallo (Brazil). 



