POMPILTJS, 155 



with a faint purple or blue tinge on the abdomen in certain lights ; 

 wings dark fuscous, with a violet iridescence. The anterior margin 

 of the clypeus widely emarginate anteriorly, the face on each side 

 with changeable silvery pile. The hiud margin of the prothorax 

 subangular ; the metathorax with a slight central channel, which 

 terminates in a small fossulet at the apex, the fossulet with a few 

 transverse carinae ; the third submai'ginal cell smaller than the 

 second, and much narrowed towards the marginal. Abdomen 

 longer than the head and thorax, and tapering to a point at the 

 apex ; the base of the segments with a little cinereous pile. 



Male. Closely resembles the female, but has the apical segment of 

 the abdomen white. 



Hah. Guatemala, 5000 feet; Guyaquil. 



The pile at the base of the segments is usually more or less ob- 

 literated. 



48. Pompilus coruscus. 



Female. Length 5^ lines. — Head and thorax black, abdomen fer- 

 ruginous ; covered with a fine silvery pile, most thinly so on the 

 abdomen. The front of the head, below the antenna?, with bright 

 glittering pile; on the vertex it is thin, and intermixed with 

 scattered erect black hairs. Thorax with the hind margin of the 

 vertex with a border of dense white pile ; on each side of the scu- 

 tellum to the wings, and also on the sides of the metathorax and 

 on the coxse, the silvery pile is glittering and dense ; wings hyaline, 

 the nervures black ; the apex of the anterior wings fuscous bej'ond 

 the third submarginal cell ; the metathorax with a central longi- 

 tudinal channel, not quite extending to the apex. Abdomen im- 

 punctate. 



Hah. Guatemala, Chinantla, 4100 feet. 



49. Pompilus imperialis. 



Male. Length 5^ lines. — Bright shining blue, with purple shades ; 

 wings dark fuscous, with a brilliant iridescence of violet and cop- 

 pery lustre. The face, not the clypeus, with silvery-white pile ; 

 the antenna) black. The hinder margin of the prothorax rounded ; 

 the metathorax with the apex slightly concave ; the second sub- 

 marginal cell subqiiadrate, the third much narrowed towards the 

 marginal. The abdomen smooth and shining. 



Hah. Costa Rica, Cache. 



50. Pompilus virulentus. 

 Female. Length 9 lines. — Ferruginous, not very brightly so, with 



