March, 19 18..1 WhEELER : AnTS COLLECTED IN BrITLSH GuIANA. 27 



33. Camponotus (Myrmothrix) femoratus (Fabr.). Eighteen work- 

 ers. 



*34. Camponotus (Myrmamblys) fastigiatus Roger. Five workers. 



*35. Camponotus (Myrmobrachys) pittieri Forel. A single worker 

 minor. 



*2(^. Camponotus (Myrmobrachys) auricomus Roger. A single worker 

 minor. 



*T,y. Camponotus (Myrmobrachys) crassus Mayr. var. near the subsp. 

 vesenyi Forel. A major and a minor worker. 



*38. Camponotus (Myrmobrachys) beebei new species. 



Worker »i{nor. — Length about 3 mm. 



Head subrectangular, a little longer than broad, scarcely narrower in 

 front than behind, with straight sides and posterior border and rectangular 

 posterior corners, convex above, with subtruncated occipital region. Man- 

 dibles small and narrow, rather convex, 5-toothed. Clypeus broader than 

 long, evenly convex, ecarinate, with straight anterior border, slightly emargi- 

 nate on each side. Frontal area and groove obsolete. Frontal carinae sub- 

 parallel behind. Eyes feebly convex, large, well behind the middle of the 

 head. Antennal scapes moderately stout, extending about J their length 

 beyond the vertical margin of the head. Thorax rather low, evenly arched 

 above in profile, with very distinct promesonotal and mesoepinotal sutures. 

 Epinotum with subequal base and declivity, the former in profile slightly 

 convex and continuing the even curve of the pro- and mesonotum, the latter 

 concave, sloping and forming a blunt obtuse angle with the base. Seen from 

 above the pronotum is flat, twice as broad as long and distinctly margined 

 on the sides, the mesonotum and base of the epinotum similarly flattened and 

 each submarginate anteriorly. Sides of thorax flat. Petiole thick, nearly as 

 high as the epinotum, its posterior surface flat in profile, its anterior surface 

 formed of two planes, the ventral short and parallel with the posterior sur- 

 face, the dorsal bevelled off to the superior border which is rather blunt. 

 Seen from the front the scale is much narrower than the epinotum, its sides 

 much contracted below, its superior border broadly rounded and entire. 

 Gaster very broadly elliptical. Legs rather stout, fore femora incrassated. 



Rather shining; head and thorax densely and finely punctate, their dorsal 

 surfaces and the mandibles also with sparse, piligerous punctures. Gaster 

 more finely punctate-shagreened ; legs and petiole more shining and more 

 superficially shagreened. 



Hairs golden yellow, glistening, short and coarse, erect only on the fore 

 coxae, tips of femora and tips of antennal scapes, absent on the petiole and 

 sides of the thorax, appressed and rather sparse on other parts of the body, 

 more abundant on the gaster but not concealing the sculpture. 



Dull orange yellow, mandibles with brown teeth. Head and thorax with 

 black markings as follows : the vertex and occiput within a space bounded by 



