Some New Species and others of Fossorial Hymenoptera. 493 



SUBFAMILY ARPACTINAE. 

 GENUS AMMATOMUS Cost. 



AMMATOMUS ELONGATULUS, sp. n. 



^ . Niger ; clypeo, scapo subtus, froute sub autennis, pronoto 

 mai'giue postico angustissime, postscutello linea trausversa, segmeuto 

 dorsali primo macula apicali utrinque, segmentis dorsalibus 2-4 fascia 

 angusta apicali in medio augustissime iuterrupta, tarsisque posticis, 

 articulis apice extreme nigris, pallide flavis ; tegulis. callis liumeralibus, 

 trochanteribus, femoribus subtus, tibiis tarsisque posticis et inter- 

 mediis bruuueo-testaceis ; alis hyalinis, venis uigris. 



Long. 8 rum. 



. Eyes strongly convergent towards the clypeus, at the base of 

 which they are separated by a distance not quite equal to the length 

 of the scape. Antennae strongly clavate, the five apical joints at least 

 as broad as long ; second joint of the flagellum a little longer than the 

 third and fourth combined. Posterior ocelli fully three times as far 

 from each other as from the eyes. Front and vertex subopaque, 

 sparsely, but rather strongly punctured; thorax coarsely, but not 

 very closely punctured ; the punctures on the dorsal surface and sides 

 of the median segment smaller and more scattered ; the triangular 

 dorsal area of the median segment bounded by rather indistinct 

 furrows. Abdomen more sparsely and finely punctured than the 

 thorax, more finely and much more sparsely on the two basal tergites 

 than elsewhere ; first tergite very narrow, forming a petiole, not 

 broadened to the apex, the sides almost parallel, longer than the 

 second tergite, which is about six times as broad at the apex as the 

 first ; tergites 3-5 with a very sparse apical fringe of very short stiff 

 hairs. Seventh tergite opaque, almost, smooth. Hind tarsi very long 

 and slender. Second abscissa of the radius nearly twice as long as 

 the first, more than half as long as the third, and distinctly longer 

 than the distance between the recurrent nervures on the cubit us. 



Hob. M'fongosi, Zululaud ( W. E. Jones), February, 1917. Another 

 specimen from Insiza, S. Ehodesia. Easily distinguished from 

 spiniferus Buyss. and africanns Turn, by the very slender petiole, 

 and by the coarser sculpture of the thorax. A. spiniferns and african n* 

 are very close to each other, and in 1915 (Ann. and Mag. Nat. Hist. 8 ? 

 xvi, p. 287) I sank africanns as a synonyn. But Du Buyssou states 

 that the second tergite is only half as bi*oad again at the apex as the 

 first, whereas in africanus it is three times as broad, so that the two 

 can scarcely be identical. 



