with remarks on some aberrant genera of the Scoliidm. 77 



punctured, very shallowly on the median segment ; the usual two 

 longitudinal sulcse on each side of the mesonotum ; the scutellum 

 subtriangular, rather narrowly truncate at the apex. Median seg- 

 ment rather slender, depressed and narrowed to the ajjex. The sides 

 of the thorax and median segment with long, sparse, cinereous 

 pubescence. Abdomen shining, almost entirely smooth, slender, a 

 little longer than the head, thorax and median segment combined ; 

 the first segment very narrow at the base, about half as wide at the 

 apex as long, the apical margin rather widely depressed. Epipygium 

 long, sparsely punctured, rounded at the ajiex ; hypopygiura not 

 projecting beyond the epipygium, trilobed, the central lobe the 

 longest. The second recurrent nervure is received a little before the 

 middle of the third cubital cell. 



Entirely black. Wings hyaline, faintly iridescent, nervures fuscous. 



Length 11 mm., exp. 19 mm. 



Hob. Lago Xanco, Chubut. 



Type in B. M. 



Nearly allied to E. herhstii, Andre, from Chili, but is 

 without a tubercle at the base of the clypeus, and the 

 median segment and first abdominal segment are much 

 slenderer in the present species. 



Elaphroptera inca, n. sp. 



(^. Mandibles long, bent inwards near the apex, bidentate, the 

 outer tooth very long, the inner one short. Maxillary palpi six- 

 jointed, the first joint very short, the third broad and rather short, 

 the second, fifth and sixth of almost equal length, about half as long 

 again as the third, the fourth joint the longest. Labial palpi four- 

 jointed, the second and third joints short and stout, together about 

 as long as the first. Labrum very long and slender, petiolate, 

 expanding abruptly at the apex in a semicircle, truncate at the 

 extreme apex and fringed with long hairs, produced from beneath 

 near the apex, the lower portion truncate and extending as far as the 

 true apex, forming with it a narrow transverse trough. Clypeus 

 sparsely punctured, rather narrow, very much produced and sub- 

 truncate at the apex, with a shallow depression on each side below 

 the centre, and a smooth, shallow, semicircular depression just above 

 the centre. Antennae as long as the head, thorax and median seg- 

 ment combined, the six or seven apical joints feebly arcuate. Head 

 rather small, a little narrowed behind the eyes, finely and closely 

 punctured ; the interantennal prominence transverse at the apex, 

 divided by a deep sulca ; a little sparse and rather long black 



