128 



apid^:. 



TETRAPEDIA, King. 



1. Tetrapedia volatilis. 



Male. Length 5 lines. — Black ; the mandibles, labrum, and elypeus 

 yellowish white ; the last with a semicircular macula at the base 

 and the tips of the mandibles black. The thorax opaque above ; 

 the wings fuscous, palest at their apical margins ; the stigma 

 rufo-testaceous ; the apical joints of the anterior and intermediate 

 tarsi, and the whole of the joints of the posterior pair, ferruginous ; 

 the hinder legs, with the apex of the tibiae and first joint of the 

 tarsi, with long bright yellow pubescence. Abdomen very smooth 

 and shining, except the extreme basal margins of the segments, 

 which are punctured; a transverse ferruginous fascia on the two 

 basal segments, that on the first in the middle of the segment, on 

 the second it is at its basal margin ; beneath, the third and fourth 

 segments are fringed with pale hairs, the fourth has also on each 

 side a floccus of long pale fulvous pubescence, which curls in- 

 wardly. 



Hah. Brazil, Constancia. 



2. Tetrapedia fervida. 



Male. Length 4 lines. — Black, with the legs and base of the ab- 

 domen obscurely ferruginous. The anterior margin of the elypeus, 

 an oblong spot on the sides of the face below the antennae, the 

 elypeus, and mandibles, white ; the antennas dark ferruginous ; the 

 flagellum beneath, except the basal joint, fulvous ; the head and 

 abdomen shining, the thorax opaque above; the wings fusco- 

 hyaline, the stigma pale rufo-testaceous ; the legs with black pu- 

 bescence ; the calcaria, which arm the apex of the tibiae, white. 

 Abdomen very smooth and shining ; beneath, the third segment in 

 the middle is covered by a semicircular kind of pad ; the fourth 

 segment has at its basal margin a narrow fringe of white pubes- 

 cence, and has also, laterally, a floccus of pale pubescence, which 

 curls inwardly ; the following segment is yellow in the middle. 



Hah. Brazil, Constancia. 



3. Tetrapedia amplipennis. 



Female. Length 4| lines. — Black ; the head and abdomen shining ; 

 thorax opaque above ; the extreme base of the abdomen sometimes 

 slightly ferruginous. The elypeus coarsely punctured, its anterior 

 and lateral margins, as well as the base of the labrum, pale testa- 

 ceous ; the antennas more or less fulvo -ferruginous beneath ; the 

 base of the scape pale testaceous. The wings dark fuscous, 

 becoming paler towards their apical margins ; the stigma rufo- 



