80 FOKMICIDvE. 



is densely pubescent. Unfortunately I have only seen one speci- 

 men which I can refer to this species, and in this the pubescence 

 is not more but less dense than in D. sculptuin. 



98. Diacamma SClllptum, Jerdon (Ponera), Madr. Jour. Lit. $ Sd. 



xvii (1851), p. 117, . 



Diacamma rugosuui*, Forel (nee Le Guilt.), & D. geometricum, 

 Forel (nee Smith), Jour. Bomb. N. H. Soc. xiii (1900), pp. 318, 

 319,320, $. 



. Black, with an erect, fine, pale scattered pilosity , and beneath 

 it a fairly dense yellow sericeous pubescence. Head rounded 

 posteriorly, a little longer than broad ; mandibles dark castaneous 

 red, sparingly punctured and with 

 traces of effaced longitudinal 

 striae ; clypeus opaque not striate, 

 with a large rounded tubercle in 

 the middle at base : the apex of 

 the median lobe rounded ; head 

 and front above the clypeus longi- 

 tudinally rather coarsely striate 

 in the middle, obliquely striate at 

 Fig. 42. Diacamma sculptum. the sides and on the inner side of 

 Node of pedicel of . the orbits of the eyes. Thorax 



anteriorly nearly as wide as the 



head ; the pronotum with one or two longitudinal striae in the 

 centre surrounded by concentric arched stria? from back to front ; 

 mesonotuni distinctly defined, opaque, not striate ; the metanotum 

 with elongate looped concentric striae from front to back, often 

 not well defined on the sides; legs rather slender. Node of 

 the pedicel very convex and rounded anteriorly, flat posteriorly, 

 with somewhat irregular concentric striae, about as long as broad 

 posteriorly, the nodal spines suberect ; abdomen rather short and 

 massive, the basal segment above with concentric striae arched 

 from back to front. 

 Length, 8-9 mm. 



Hob. Sikhim (Moller); Barrackpore, Bengal (Hothney) ; Kauara; 

 Mysore; Malabar, the Nilgiri hills (Wrouyhton): Cochin; Travan- 

 core (Ferguson) ; Ceylon (Yerbury). 



* Le Guillou's description of Ponera ruyow from Borneo (Ann. Soc. Ent. Fr. 

 x, 1841, p. 318) is not detailed enough for identification of the form of Diacamma 

 he had before him, but according to Messrs. Forel and Emery D. mgosum, Le 

 Guill., = D. versicolor, Smith. The type of this latter, and also of D. geome- 

 tricum, Smith, from Singapore, are in the British Museum Collection. They 

 are quite different from anything I have seen from India, Burma, or Ceylon. 

 Jerdon's Ponera smilpta was from Malabar. I identify with it the more robustly 

 built of the two forms of Diacamma occurring in Western India. This, the slightly 

 larger form, is recorded from Mysore, Malabar, Cochin and Travancore, besides 

 other localities in Northern and Eastern India, and from Ceylon. On the 

 contrary, the smaller slighter form which I identify as D. vagans, Smith, has 

 not in Western India been recorded from any locality further south than 

 Kanara. 



