ARMY ANTS IN BRITISH GUIANA. 307 



coarser piligerous punctures. These punctures are more scattered 

 on the legs, mandibles and antennal scapes, but otherwise their 

 sculpture is like that of the head. 



" Hairs bright golden yellow, in some lights almost ruby red, short, 

 erect or reclinate, very short and most abundant on the head, longer 

 and of uneven length and thickness on the thoracic dorsum, sparse 

 and reclinate on the petiole and gaster. The longer hairs on the 

 scapes and legs are also more reclinate and somewhat flexuous. Venter 

 and sides of petiole, the meso- and metapleurse and the external sur- 

 faces of the coxpe almost hairless. On the clypeus and gula the hairs 

 are long and many of them flexuous. Pubescence absent, except on 

 the antennal funiculi. 



Rich reddish brown; mesopleurse, declivity of epinotum, coxse and 

 femora, except at their articulations, castaneous brown; epinotum, 

 except its dorsal surface, petiole and gaster black; apical halves of 

 petiolar horns on their dorsal surface bright orange yellow as are also 

 the posterior borders of the ventral gastric segments and a broad 

 apical band, almost interrupted in the middle, on each of the dorsal 

 segments. 



Male (Fig. 3a, Fig. Ab, Fig. 5c, Fig. 6a-d). Length nearly 20 mm. 



Head large, rather flat in front, through the eyes somewhat less than 

 twice as broad as long. Eyes small, only a little more than three 

 times as long as the cheeks and not very convex. Ocelli small, the 

 distance from each lateral ocellus to the eye being fully twice the great- 

 est diameter of the former. Frontal carinpe very short, not prolonged 

 backward and curved outward behind. Frontal area distinct, 

 impressed, elongate. Antennal scapes about as long as the sides of 

 the head, slightly curved, moderately stout; funiculi long; first joint 

 longer than broad, joints 2-4 twice as long as broad, remaining joints 

 shorter, except the last, which is slender and pointed. Clypeus rather 

 flat, its anterior border very broadly, feebl}^ and arcuately concave. 

 Mandibles long, narrow, straight, and flattened, very abruptly bent 

 downward at the extreme base, their tips curved, blunt; their blades 

 broadest at the basal third where the inner border has a broad, very 

 blunt tooth. Mesonotum not broader than the head including the 

 eyes, not very convex in front and not concealing the pronotum when 

 the insect is viewed from above, somewhat longer than broad, some- 

 what narrowed in front, with a median longitudinal groove on its 

 anterior half. Sides of pronotum concave. Epinotum in profile 

 with very short base and long, sloping, concave declivity, the lateral 

 corners between the two surfaces forming blunt protuberances. Epi- 



