of Fossorial Hymenoptera. 449 



of the anteniiai in front, the clypeus, mandibles, and palpi 

 white ; the coxas, anterior legs, and the base of all the tibiae 

 white ; the wings hyaline and iridescent ; the tegnlas testa- 

 ceous, a fuscous cloud occupying the marginal and second 

 and third submarginal cells; theprothorax with a white fascia 

 on its posterior margin. Abdomen : the three basal segments 

 white beneatli. 

 Hah. Para. 



Agenia ordinaria. 



Female. Length 5^ lines. Black, with the abdomen red, 

 and anterior wings fuscous. Head : a pale abbreviated line 

 at the inner orbits of the eyes ; the palpi also pale. Thorax : 

 the posterior margin of the prothorax arcuate ; the metathorax 

 narrowed to, and truncate at, the apex ; the third submarginal 

 cell nearly twice as wide as the second, and much narrowed 

 towards the marginal cell ; the posterior wings hyaline and 

 beautifully iridescent. The extreme base of the abdomen 

 black. The entire insect covered with a thin hoary pile. 



Hah. Santarem. 



Agenia aureicornis. 



Female. Length 3 1 lines. The head and thorax olive-green ; 

 the abdomen blue ; the wings with two fuscous fasciee. Head : 

 the clypeus with a changeable silvery pile ; the scape of the 

 antennae in front, and the five apical joints of the antcnnje, 

 bright orange-yellow ; the rest of the joints obscure fulvous 

 beneatli. Thorax : the first fascia crosses the anterior wings 

 at the apex of the externo-median cell and the base of the 

 first submarginal, the second from the base of the marginal. 

 Abdomen smooth and shining, and thinly covered with hoary 

 pile ; a few long black hairs at its apex. 



Hah. Santarem. 



Agenia gratiosa. 



Female. Length 4 lines. Green, with the anterior margin 

 of the fore wings narrowly fuscous. Head a little wider than 

 the thorax ; the lower part of the face and the clypeus covered 

 with silvery pile ; the antennse fulvous beneath and fuscous 

 above ; mandibles ferruginous towards their apex, and the 

 palpi pale testaceous. Thorax : the posterior margin of the 

 prothorax, and the base, sides, and apex of the metathorax, with 

 short glittering silvery pubescence ; wings hyaline, the fuscous 

 stain covering the marginal, first and second submarginal cells, 

 and extending at each end a little way beyond ; the nervures 

 pale testaceous, with those towards the margin of the anterior 



Ann. & Mag. N. Hist. Ser. 4. Vol. xi. 29 



