110 
[ J UI/Y 
black, with the clypeus very smooth and shining, and delicately punc¬ 
tured. The thorax with black pubescence above and beneath, that on 
the sides pale yellow; the pubescence on the legs entirely black; the 
wings fusco-hyaline, the nervures black. Abdomen: the three basal 
segments clothed with pubescence of a pale yellow, somewhat lemon- 
colored ; that on the third segment not quite extending to the lateral 
margins; the apical segment thinly sprinkled with ferruginous hairs. 
“ Woi^ker. Length 5 lines. Colored like the female. 
“ Hab. Oajaca, Mexico. In the Collection of the British Museum.” 
43.—^44. B. diligens. 
Bomhus diligens Smith, Journal of Entomology, i, p. 154. 
‘‘ Female. Length 10 lines. Black, and clothed with black pubes¬ 
cence; wings dark brown, shining. The pubescence on the thorax 
short and dense, except on the disk above, which is smooth and shin¬ 
ing; the three apical segments clothed with ferruginous pubescence, 
the apical segment smooth and shining in the middle. 
Hah. Oajaca, Mexico. In the Collection of the British Museum.” 
Gen. APATHUS Newm. 
Apathus ISTewm. Eiit. Mag. ii, p. 404 (1834). 
Psitliyrus St. Farg. Ann. Soc. Ent. Fr. i, p. 366 (1832); Hym. ii, p. 424 (1841); 
nee. Huhner. 
This genus is parasitic on that of Bomhus and resembles it ver}^ 
much in general appearance. The characters with which to distinguish 
it from Bomhus.^ are as follows:—'The posterior tibiae are destitute of 
corbiculas, and are convex exteriorly; the basal joint of the posterior 
tarsi has no tooth at its base above. In the female the apex of the 
abdomen curves under, and the apical segment beneath has the lateral 
margins elevated. The mandibles have a single notch, while those of 
Bomhus are distinctly toothed. This genus has no workers. 
The males may be distinguished from those of Bomhus by the poste¬ 
rior tibige being exteriorly convex and thickly coated with short hairs. 
The males of the latter genus have the exterior surface of the posterior 
tibise concave in the centre, with a few scattered hairs, and are fringed 
at the exterior margins. 
