9. Oecodoma Mexicana ^HNS. Pl. X. fig. 20. B.M.

Atta fervens, Say ^HNS, Bost. Journ. Nat. Hist. i. 290.

Female. Length 8-9 lines. - Obscurely ferruginous, nearly black; closely resembling O.e cephalotes ^HNS, but the thorax is more elongate; the second node of the abdomen wider, with the lateral angles produced and acute; the base of the abdomen truncated, the first segment longer than broad; in other respects resembling O.e cephalotes ^HNS, but more hairy or downy.

Male. - In size and form resembling the male of CE. cepha- lotes?, but of a uniform pale reddish yellow; the second abdominal node much wider.

Hab. Mexico.

The insect described as laevigata ^HNS is probably the worker of this species; in the Museum are several specimens from Mexico.