-444 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
108. Monomorium (Mitara) subterraneum, sp. nov. 
Plate 4, figs. 29, 30. 
Worker. (Plate 4, figs. 29, 30). Length 3.5 mm. to 5 mm. 
Head, excluding mandibles, as long as broad, nearly as broad in 
front as behind, with convex sides and feebly concave occipital border. 
Eyes small, located at sides of head, a little posterior to the middle. 
Clypeus very convex, unarmed, the anterior border somewhat concave. 
Frontal carinae short, straight. Antennae 11-jointed; scapes extend- 
ing a little past the occipital corners of head; first funicular joint 
longer than broad and nearly twice the length of the second, which is a 
little longer than broad; joints 3-7 as broad as long; joints 8-10 form- 
ing an elongate club, almost as long as the rest of funiculus, the apical 
joint of which is longer than the two preceding together. Mandibles 
rather thick, the blade with five strong teeth. Pronotum transverse, 
convex above and at sides, broadest a little behind the middle. Pro- 
mesonotal suture barely perceptible; mesoépinotal impression strong. 
Epinotum in profile evenly rounded; the sides very feebly margined. 
Petiole slender, the node in profile deeper than thick, rounded above, 
convex at the anterior, flat at the posterior surfaces. Postpetiole 
transverse, subglobose. Gaster as long as thorax and epinotum, 
broadly oval. Legs long and slender. 
Sublucid. Mandibles, sides of clypeus, and frontal carinae coarsely 
striate longitudinally; cheeks with strong concentric striae, which 
terminate at the carinae, the vertex with sparse irregular rugae, the 
rest of head and the thorax densely punctulate. Epinotum trans- 
versely, and the posterior surfaces of the petiolar and postpetiolar 
nodes longitudinally carinulate. Gaster shining, sparsely punctate. 
Apical half of funiculus pubescent; the rest without pubescence but 
abundantly pilose, the pile stiff and erect. 
Color testaceous, with a fuscous blotch on the front and vertex. 
Described from a number of workers from Madeira-Mamoré 
Camp 39. These were in the ground, beneath the base of a recently 
uprooted palm, about three feet below the surface. 
In a recent paper (Ann. Soe. ent. Belg. 1913, 57, p. 261) Emery has 
divided those species of Monomorium which have eleven-jointed 
antennae into three subgenera. Of these, M. subterraneum must 
be placed in Mitara, which hitherto has contained only African, Asi- 
atic, and Australian species. The species in this subgenus have the 
clypeus entirely without denticles or carinae, the eves developed, and 
