1905.] Wheeler, Ants of the Genus Dolichoderus. 311 



its anterior border notched and impressed in the middle. Antennal scape 

 curved at the base; tip extending to a distance equal to its diameter beyond 

 the posterior corner of the head. First funicular joint equal to the two suc- 

 ceeding subequal joints together; joints 4-10 nearly as broad as long; terminal 

 a little longer than the two preceding joints taken together. Pro- and meso- 

 notum flattened above, but slightly rounded; mesoepinotal constriction pro- 

 nounced; basal surface of epinotum in profile higher than the mesonotum, 

 higher behind, somewhat flattened or even impressed near .the middle, ter- 

 minating behind in a sharp margin, below which lies the concave declivity. 

 Seen from above the margin is broadly rounded and passes down on either side 

 to the metastemum. The declivity in profile is not an arc of a circle, as in 

 maricB and taschenbergi, but has a straight or even convex outline above. Peti- 

 ole thick, with a shorter and more convex anterior, and a longer, somewhat 

 flattened posterior surface; dorsal border in profile rather sharp, seen from 

 behind, straight and transverse. Gaster rather small, flattened, oval when seen 

 from above, with rounded anterior border. There is a very faint constriction 

 between the first and second segments 



Mandibles glossy, with fine longitudinal striae and coarse punctures. Head 

 and thorax subopaque. Clypeus and front covered with rather sharp longi- 

 tudinal rugae. Remainder of head and thorax densely punctate-foveolate, the 

 foveolse being so close together on the meso- and epinotum that their surfaces 

 may be described as coarsely reticulate-rugose. Epinotal concavity, petiole, 

 gaster, and legs smooth and shining, very finely shagreened ; summit of petiole 

 somewhat opaque and rugose. 



Hairs whitish, erect, rather sparse but conspicuous on the mandibles, an- 

 tennal scapes, upper surface of head and thorax, but less abundant on the 

 gaster and very short and incon- 

 spicuous on the legs. Pubescence 

 very sparse and barely visible, 

 except on the gaster and antennas. 



Mandibles black, with reddish 

 internal edges. Head, palpi, and 

 antennae black ; scape and first 

 funicular joint reddish yellow. 

 Thorax and petiole dark red ; meso- 



and epinotum and border of petiole Fig. C. Dolichoderus plagiatus Mayr. Worker. 



sometimes black. Gaster black, 



with much of the base of the first segment and a large spot on either side of the 

 second segment reddish yellow. In specimens from some colonies the first and 

 second segments are reddish yellow throughout, or with only a dark median 

 cloud on the second segment. Legs reddish yellow. 



Female (dealated). — Length, 4-4.25 mm. 



Head very similar to that of the worker. Thorax nearly as broad as the 

 head, with the epinotum shaped like that of the worker, except that the convex 

 basal surface is not so high as the mesonotum and does not slope upward from 

 before backward. Seen from above the sharp margin between the basal sur- 

 face and concavity is straight and very feebly excised or sinuate in the middle. 

 The foveolae on the head and thorax are pronounced; they are smaller and 



