March, igiS.] WhEELER : AnTS COLLECTED IN BRITISH GuiANA. 25 



*i(j. Crematogaster ornatipilis sj). nov. 



Worker. — Length 1.7—2.2 nun. 



Head subrectangular, distinctly l)roader than kjng, as broad in front as 

 behind, with straight sides and very feebly concave posterior border. Man- 

 dibles narrow, their apical borders oblique, 4-toothed. Clypeus broad, evenly 

 convex, ecarinate, with the anterior border straight and entire in the middle. 

 Eyes rather convex, moderately large, just behind the middle of the head. 

 Frontal carinae short, slightly diverging behind. Antennae rather stout ; scapes 

 reaching a little behind the posterior corners of the head; funiculus with, a 

 2-jointed club, shorter than the remainder of the funiculus; first joint as long 

 as the three succeeding joints together, joints 2-8 distinctly longer than 

 broad. Thorax short and robust ; pronotuni, without the neck, as broad as 

 long, broad through the humeri which are rather angular, rapidly narrowing 

 behind, rather con\ex above, submarginate on the sides. Promesonotal suture 

 obsolete ; mesonotum very short, sloping rapidly to the narrow and rather 

 deep mesoepinotal constriction, on each side with a blunt denticle. Epinotum 

 broader than long, nearly as broad as the pronotum through the humeri ; the 

 base very short, with an acute denticle on each side, the declivity large, con- 

 cave, sloping, occupying all the space between the slightly diverging spines 

 which are as long as the base, shorter than their distance apart, with slender, 

 blunt, and slightly deflected tips. Petiole fiat, a little broader than long, with 

 semicircular anterior border, straight parallel sides and straight, transverse 

 posterior border; in profile cuneate, less than twice as long as high at the 

 posterior end. Postpetiole transversely elliptical, as broad as the petiole 

 and nearly twice as broad as long, convex above, with a very faint longitu- 

 dinal impression, distinct only at the posterior border. Gaster rather large, 

 with straight, transverse anterior border, convex sides and pointed tip. 



Shining; mandibles very sparsely punctate. Clypeus and head very 

 smooth and shining, with very sparse, piligerous punctures; cheeks rugose in 

 front, the space behind them and between the eyes and frontal carina sub- 

 opaque and densely and finely punctate. Neck smooth and shining; pronotum 

 above finely longitudinally rugose and punctate; epinotum densely punctate 

 and subopaque. Upper surface of petiole smooth, its posterior border and the 

 postepetiole finely punctate. Gaster very smooth and shining, with very sparse, 

 piligerous punctures, segments behind the first very feebly and finely sha- 

 greened. 



Hairs on the body very conspicuous, sparse, erect, clavate, obtuse, yellow 

 at the base, black at the tip, shorter on the head than on the thorax, pedicel 

 and gaster. Mandibles, scapes and legs with numerous, rather long, pale, 

 appressed and pointed hairs. 



Black or very dark brown ; mandibles, legs, antennal funiculi, insertions 

 of scapes, epinotal spines, petiole, except at the posterior border, neck and 

 articulations of the pedicel, reddish brown. 



