of Fossorial Hymenoptera. 447 



the posterior margin of the prothorax arcuate; the tarsi 

 obscure ferruginous ; the nervui-es of the wings nearly black ; 

 the wings iridescent. Abdomen petiolated ; the apical margin 

 of tlie second and following segments narrowly testaceous. 

 Hah. Para. 



Agenia cceruleocepliala. 



Female. Length 5 lines. Head and thorax blue, exhibiting 

 tints of purple, green, and violet in certain lights ; abdomen 

 ferruginous. Head pm-ple, covered with silveiy pile below 

 the insertion of the antennas ; the mandibles, palpi, and scape 

 of the antennae beneath pale testaceous ; the flagellum fulvous 

 beneath. Thorax : the posterior margin of the prothorax 

 subangular, and bordered with silvery pile ; the sides of the 

 thorax silvery ; the metathorax with a central longitudinal 

 impressed line, which widens towards the apex ; wings hyaline 

 and iridescent, the nervures ferruginous ; legs ferruginous. 

 Abdomen petiolated ; the base of the petiole blue. 



Hah. Para; St. Paulo. 



Agenia deceptor. 



Female. Length 4 lines. Pale ferruginous, abdomen darkest, 

 with the vertex and thorax above dark fuscous. Head : 

 above the insertion of the antennas nigro-asneous, and with a 

 pale stripe at the margin of tlie eyes ; the apical half of the 

 antennas fuscous above. Thorax : the posterior margin of 

 the prothorax arcuate, and bordered with a pale ferruginous 

 band ; the postscutellum, tegul^, and apex of the metathorax 

 pale fen-uginous ; wings hyaline, the superior pair with their 

 anterior margin slightly fuscous. Abdomen petiolated. 



Hah. Para. 



Agenia timida. 

 Male. Length 3^ lines. Head and thorax blue ; abdomen 

 black, with the petiole ferruginous. Head wider than the 

 thorax ; the face and clypeus silvery ; the margins of the 

 clypeus, apex of the mandibles, palpi, inner orbits of the eyes 

 not as high as their vertex, and the scape of the antennae in 

 front very pale ferruginous. The posterior margin of the 

 prothorax arcuate ; the metathorax with a central longitudinal 

 depression, and the sides with silvery pubescence ; wings 

 hyaline and iridescent, the nervures and tegulfe testace<:»us ; 

 the legs ferruginous, the apical joints of the anterior and in- 

 termediate pairs, and the posterior pair entirely, as well as the 

 apex of the tibia^, fuscous. Abdomen : the petiole and basal 



