408 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
18. Ectatomma (Gnamptogenys) annulatum Mayr. 
Not uncommon at Porto Velho, and Camp 39, Madeira-Mamoré 
R. R., where several females and workers were taken. Two workers 
from Paréa are also in the collection. A nest was found in a cavity of a 
fence post, where the wood was rotten. 
The striolation of E. annulatum is very delicate, longitudinal on the 
pro- and mesonotum, transverse on the epinotum and petiolar node. 
The specimens vary in color from fuscous to ferruginous. The legs 
of all are yellowish brown, with a fuscous blotch at apex of tibiae and 
femora. 
19. Dinoponera grandis (Guérin). 
Several specimens of the typical form of the species, as designated 
by Emery (Ann. Soe. ent. Belg., 1901, 45, p. 47) were taken at Para, 
in the suburb Souza. The subopaque gaster, abundance of hairs on 
the body and the well-developed ventral tooth of the pronotum, are 
characteristic of this form. The petiole in profile is quadrangular, as 
high behind as in front, and the thorax and gaster bear fine recumbent 
pubescence, which gives a brownish appearance to the body. 
20. Dinoponera grandis subsp. lucida Emery. 
Two workers from Porto Velho. 
This subspecies differs from the typical D. grandis in having the 
prothorax, node, and gaster shining; the petiole from above is more 
slender and in profile has the upper surface convex instead of nearly 
straight; the prothoracic spine is lacking; the pubescence of the thorax 
is more dense. 
21. Dinoponera grandis subsp. mutica Emery. 
Plate T,ofigs055: 
Abundant at Natal, Baixa-Verdé, Cearé-Mirim, and Independencia. 
The prothoracic spine is absent; the node shorter than in the typical 
D. grandis, in profile pointed in front, rounded behind. The body is 
more shining, the pilosity and pubescence less conspicuous. 
There were several colonies of D. mutica in the vicinity of our house 
