102 AMERICAN HYMENOPTERA. 



tirely dark and sometimes with yellow strongly predominant above the 

 bases of the antennae, there being all gradations between these two 

 conditions on both face and occiput. Dorsum of thorax as in queen, 

 but with interalar band broad and usually well defined (this band is of 

 varying width in different individuals, reaching a maximum of two- 

 thirds as wide, from front margin to rear margin, as long, from wing 

 base to wing base). Yellow patch on third dorsal abdominal seg- 

 ment sometimes covering not more than one-fifth of the segment and 

 sometimes covering nearly half of it, but usually covering less than 

 one-third, its sides often rapidly diverging (instead of converging) 

 posteriorly. 



Wings. — Light, transparent, only slightly infuscate. 



Z.i?^.f.— Mostly dark ; in all but one specimen, lacking the yellow pile 

 present on some of the hind leg segments of the queen. 



Male. — Unknown. 



Dimensions . — Length : queen, about 15 mm. ; worker, 11 mm. to 

 14 mm. Spread of wings: queen, 36 mm. ; worker, 26 mm. to 29 mm. 

 Width of abdomen at second segment : queen, about 1\ mm. ; worker, 

 5 mm. to 6| mm. 



Habitat. — Guatemala (Quiche — one worker, Antigua — six 

 workers, Guatemala City — four workers) and Ecuador (one 

 queen and three workers). 



This species apparently belongs to the Dumoucheli group 

 and probably has its closest allies in montezumcr and ?ngro- 

 dorsalis. Its yellow pile is very pale yellow. The worker 

 caste is here redescribed from four specimens, one of which 

 was collected in Guatemala (Quiche) and the other three in 

 Ecuador. 



Bouibus (Bombns) emilise D. T. 

 II Bonibus thoracicus Sichel, Ann. Soc. Ent. France, (4), II, 1862, p. 



121, 9 S c? ; T. 14, F. 2 (9) and 3 (cJ'). 

 ? " bellicosus Smith, Descr. New Spec. Hym., 1879, p. 131, n. 

 1, 9 (excl. patria). 

 " thoracicus Holmberg, Anal. Soc. Cient. Argent., VIII, 1879, 

 p. 157, n. 2, 9 a d^. 

 ? " nmscorum var. Corsicus Dalla Torre, Ber. naturw.-mediz. 

 Ver. Innsbr., XII, 1882, p. 30, S (excl. patria). 

 " thoracicus Holmberg, Actas Acad. Ci. Cordoba, V, p. 2, 1884, 



p. 118, n. 2, 9 c:?' S . 

 " " Radoszkowski, Bull. Soc. Natural. Moscou, LIX, 



1884, p. 79; T. 3, F. 29. 

 " " Ant. Handlirsch, Ann. Naturh. Hofmus. Wien, 



III, 1888, p. 235; T. 10, F. 4. 



