114 bulletin: museum of comparative zoology. 



head and petiole. It is also very different from C. horrens Forel of 

 the Philippines and moeschi Forel of Sumatra. 



173. Camponotus (Myrmosphincta) megalonyx, sp. nov. 



Worker major. Length about 7 mm. 



Robust; head large, trapezoidal, broad behind and narrow in front, with 

 straight, anteriorly converging sides and deeply excised posterior border, 

 high and convex in the region of the vertex, with the posterior corners and 

 lateral borders feebly depressed. Eyes on the dorsal surface behind the 

 median transverse diameter of the head, rather small, moderately convex. 

 Mandibles stout and convex, their apical borders long, 6-toothed. Clypeus 

 rather flat, subcarinate behind, the median portion subhexagonal, as long as 

 broad, the lateral portions short, triangular, far from reaching the anterior 

 corners of the head; the anterior border sinuately excised on each side, with a 

 short, narrow, rounded lobe in the middle. Clypeal foveae pronounced. 

 Frontal area large, subtriangular; frontal groove very distinct. Frontal 

 carinae sinuous, diverging behind. Antennae short and stout; scapes feebly 

 curved, narrow, and terete at the base, gradually thickened towards their tips, 

 not reaching the posterior border of the head. Thorax very short; pronotum 

 broad, narrower than the head, convexly rounded, excluding the neck twice 

 as broad as long; mesonotura very short, broader than long, bordered anteri- 

 orly by a strong semicircular, promesonotal suture, rapidly sloping in profile 

 to a deep, narrow constriction only as broad as the prominent metanotal 

 stigmata on each side of it. Epinotum subcuboidal, only half as broad as the 

 pronotum, higher than long, with flat sides; in profile with the base abruptly 

 truncated in front. Straight and horizontal above and forming a right angle 

 with the flattened, truncated declivity which is narrowed below. Petiole 

 higher than long, subcuboidal, much lower than the epinotum, the node thick, 

 higher than long, the anterior surface slightly concave and higher than the 

 posterior surface, the dorsal surface rounded and sloping backward and down- 

 ward. Gaster broadly elliptical, smaller than the head, somewhat flattened. 

 Legs stout, the terminal tarsal joint, claws, and empodia noticeably enlarged; 

 tibiae slightly flattened but not chanelled, without a row of bristles on their 

 flexor surfaces. 



Opaque ; head and gaster slightly lustrous ; very finely, densely, and evenly 

 punctate, with sparser piligerous punctures, abundant and transverse on the 

 gaster. Mandibles and legs shining, very finely and superficially shagreened, 

 the mandibles also coarsely and sparsely punctate and near their apical margins 

 coarsely striate; legs with sparse piligerous punctures. 



Hairs reddish, rather abundant, erect; long and flexuous on the thoracic 

 dorsum and first gastric segment, shorter elsewhere; absent on the cheeks and 

 almost absent on the antennal scapes, present on the gula and legs. Pubescence 

 long and abundant but nowhere concealing the sculpture, conspicuous on the 

 posterior portion of the head, the thorax and gaster. 



