PROSOPIS. 21 



This species occurs rarely on the mountains of Oahu. The 

 Rev. T. Blackburn has found a single female, which differs from 

 the male in having the body shorter and stouter, with the ter- 

 minal ventral segments pointed, and the basal joint of the antennae 

 narrow and cylindrical. 



13. Prosopis facilis. 



Female. Length 3| lines. — Black ; the head and thorax very closely 

 and finely punctured; abdomen shining and impunctate. Head 

 suborbiculate ; the clypens coriaceous, with some large shallow 

 punctures here and there. The mesothorax with a short im- 

 pressed line over the tegulae; the metathorax with short longi- 

 tudinal striae at the base, the sides having a little white pubes- 

 cence ; the wings fusco-hyaline, hyaline at their base, and brightly 

 iridescent. Abdomen smooth, shining, and impunctate. 



Male. Very like the female, but more slender ; the clypeus and a 

 line at its lateral margins, on the face, yellow ; the scape of the 

 antennae swollen, but black. The anterior tibiae and tarsi in front, 

 and also the apex of tho femora yellow ; the wings paler than in 

 the female ; the base of the intermediate and posterior tibiae rufo- 

 testaceous. Abdomen oblong- ovate, smooth, shining, and im- 

 punctate. 



Hab. Island of Maui. 



14. Prosopis hilaris. 



Male. Length 3 lines. — Head and thorax black, the two basal seg- 

 ments and the base of the third ferruginous. Head with the front 

 as high as the antennae, and on each side, along the margin of the 

 eyes, a little above them, yellow ; the scape of the antennae and the 

 mandibles yellow, the latter ferruginous at their tips; the scape 

 dilated ; the nagellum ferruginous. The legs ferruginous, with the 

 coxae and femora towards their base black; wings hyaline and 

 iridescent, their apex faintly clouded ; the metathorax subrugose. 

 Abdomen smooth and shining. 



Hab. Occurs rarely on flowers in the island of Maui. 



15. Prosopis volatilis. 



Male. Length 3 lines. — Head and thorax black, the two basal seg- 

 ments of the abdomen ferruginous. Head with the front, below 

 the antennae, yellow ; the flagellum fulvous, and more or less fus- 

 cous above ; the scape has a fulvous line in front ; the mandibles 

 ferruginous towards their apex. The anterior tibiae, tarsi, and tips 

 of the femora ferruginous ; the metathorax finely rugulose, opaque, 



