BIACAMMA. 81 



Aftei- an examination of a very long series of this species I 

 have not found a single individual, either in Mr. Wroughton's, 

 Mr. Eothney"s, the British Museum, or my own collections, from 

 any locality in Assam, Burma, or Tenasserim. A few specimens 

 from yikhim have on the pronotum one or two transverse striae 

 in the middle surrounded by concentric strise arched towards the 

 front, in this resembling D. vcu/ans, Smith. They can, however, 

 be distinguished by the attenuate suberect nodal spines. 



B. rvj/osum, var. rotlineyi, Forel, is founded on specimens from 

 Cochin in Mr. Kothney's collection. It is of an intense shining 

 black, with the pubescence much more sparse. 



99. Diacamma vagans, Smith (Ponera), Jour. Linn. Soc. v (1861), 

 p. 103, ?. 



5 . Black, with a beautiful greenish-bronzy tint, the mandibles, 

 the base and apex of the scape of the antennae and the legs cas- 

 taneous red, the latter varying sometimes to reddish brown, the 



apical margins of the abdominal 

 segments and the whole apical seg- 

 ment testaceous. Head, thorax and 

 abdomen covered rather sparingly 

 with short erect reddish liairs ; pu- 

 bescence moderate, sometimes very 

 dense, of a pale yellow colour, fine 

 and sericeous. Head oval, pro- 

 portionately longer than in any 

 Fig. ■iS.-Biacamina vagans. other species ; mandibles punctured, 

 Node of pedicel of g . strongly dentate ; clypeus convex, tec- 



tiform, opaque not striate, the median 

 lobe rounded at apex ; head above the antennae generally more or 

 less deeply and regularly striate, the striae longitudinal in the middle, 

 oblique on the sides and on the inner side of the eyes. Thorax 

 slender and elongate ; pronotum with from one to four transverse 

 striae, surrounded by concentric striae ; mesonotum distinct, with 

 shallow punctures ; metanotum striate, the striae running obliquely 

 forwards from a medial impressed line more or less marked in all 

 specimens ; legs long, rather robust. Node of the pedicel con- 

 centrically striate, proportionately shorter than in JJ. scidptum., 

 with a more gradual auterior slope, truncate posteriorly, spines 

 thick, variable in length ; abdomen proportionately narrower and 

 elongate, the striae on the basal abdominal segment variable, in 

 certain specimens distinct, concentric, arched from back to front, 

 in others almost effaced. 



(S . With the characters as shown under the genus. Black; 

 the mandibles, antennae and legs reddish brown, the apical 3 or 4 

 abdominal segments testaceous. 



Leii;/th, ^ b-9-5 ; d 13 ; wing 9 mm. 



Hah. Nikhim (J/67/er) : Calcutta (liothneji); Orissa ; Bombav ; 

 YOJ>. n. G 



