BIACAiMMA. 



First iibdomiual segment with all tlie 

 stiiie iu concentric archer from back 

 to front. 



a'-. Nodal spines attenuate at base, poiut- 

 mg obliquely outwards, and forming 

 a distinct angle witli the upper sur- 

 face of the node 1). sculpiiiiit, p. t*0. 



b'-. Nodal spines rather thick at base, 

 pointing backwards in continuaticn 

 of the upper surface of the node, nut 

 obliquely outwards I), vckjiuis, p. 81. 



94. Diacamma scalpratum, Smith (rouera), Cat. vi (1858), p. 84, 

 pi. 6, tigs. 21 & 2-2, 5 ; Forel, Jour. Bomb. N. H. Soc. xiii (1900), 

 p.317, ^. 



g . Black, with sparse erect pale hairs, and a fine sericeous 

 yellow pubeseeuce, very sparse on the head and thorax, dense on 

 the abdomen. Head rectangular, the posterior lateral angles 



rounded ; mandibles powerful, armed 

 with 7 or S large teeth, \\ith smaller 

 teeth betu een them ; clypeus convex, 

 the median lobe produced and broadly 

 rounded at apex, dull and opaque, 

 faintly obliquely striate at the sides ; 

 autennoe finely reticulate, punctate, 

 pubescent and pilose, the 2nd joint 

 of the flagellum longer than the 1st; 

 the whole liead above the autenn;e 

 regularly longitudinally striate. 

 Thorax : the pronotura broad, rounded, 

 convex, constricted anteriorly into a 

 sort of collar which is stronglv de- 

 pressed, opaque but not striate, the 

 disc of the pronotum with one or 

 two transverse striie surrounded by 

 concentric striae ; mesonotum narrow, 

 transverse, punctured, not striate ; 

 metanotum long, compressed, with 

 concentric striae on the basal portion 

 above, oblique strise on the sides, the 

 apex obliquely truncate, strongly 

 margined and transversely striate ; 

 the apical face slightly concave ; legs 

 densely pilose and pubescent. Node 

 of the pedicel twice as long as broad, 

 truncate anteriorly and posteriorly, 

 above flat, not striate, sloping from 

 back to front, posteriorly armed \\\\:h. two acute short parallel 

 spines, longitudinally and somewhat obliquely striate on the sides: 

 abdomen massive, sting exserted. 



" S • The mandibles ai'e narrow and feeble, with the apex 



Fig. 40. 



Diacamma scalpraium, ^ . 

 a. Node of pedicel. 



