DIACAMMA. 77 



b'. First abdominal segment with all the 

 striae in concentric arches from back 

 to front. 



a 2 . Nodal spines attenuate at base, point- 

 ing obliquely outwards, and forming 

 a distinct angle Avith the upper sur- 

 face of the node D. sculptum, p. 80. 



6 2 . Nodal spines rather thick at base, 

 pointing backwards in continuation 

 of the upper surface of the node, not 

 obliquely outwards D. vayans, p. 81. 



94. Diacamma scalpratum, Smith (1'onera), Cat. vi (1858), p. 84, 

 pi 6 fi^s. 21 & 2i>, ; Forel, Jour. Bomb. N. H. Soc. xiii (1900), 

 p.317,V 



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

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

 the abdomen. Head rectangular, the posterior lateral angles 

 rounded ; mandibles powerful, armed 

 with 7 or 8 large teeth, with smaller 

 teeth between them ; clypeus corn-ex, 

 the median lobe produced and broadly 

 rounded at apex, dull and opaque, 

 faintly obliquely striate at the sides ; 

 antennae finely reticulate, punctate, 

 pubescent and pilose, the Und joint 

 of the flagellum longer than the 1st; 

 the whole head above the antennie 

 regularly longitudinally striate. 

 Thorax : the pronotum broad, rounded, 

 convex, constricted anteriorly into a 

 sort of collar which is strongly de- 

 pressed, opaque but not striate, the 

 disc of the pronotum with one or 

 two transverse striae surrounded by 

 concentric striae; mesonotum narrow, 

 transverse, punctured, not striate ; 

 metanotum long, compressed, with 

 concentric striae on the basal portion 

 above, oblique striae on the sides, the 

 apex obliquely truncate, strongly 

 margined and transversely striate ; 

 the apical face slightly concave ; legs 

 densely pilose and pubescent. Node 



Fig. 40. 



Diacamma scalpratum, 

 a. Node of pedicel. 



of the pedicel twice as long as broad, 

 truncate anteriorly and posteriorly, 

 above flat, not striate, sloping from 

 back to front, posteriorly armed with two acute short parallel 

 spines, longitudinally and somewhat obliquely striate on the sides ; 

 abdomen massive, sting exserted. 



" c? . The mandibles are narrow and feeble, with the apex 



