little-known Species of Tliynnidfie. 135 



segment as long as the pvonotum, very narrow at the base, 

 broadened and obliquely truncate posteriorly, with a small 

 tubercle in the middle just before the base of the truncation. 

 Head shining, very sparsely and finely punctured, the thorax 

 opaque and more closely punctured, the pronotum not ex- 

 cavated. Abdomen broad, sparsely and shallowly punctured ; 

 the basal segment with a shallow transverse groove before 

 the apex and without hairs at the base ; the second segment 

 transversely and coarsely rugose, with a deep transverse 

 groove at the apex bordered by raised transverse caringe. 

 Pygidium longer than broad, finely longitudinally striated, 

 the apex smooth and broadly rounded, the ep!})ygiura broad 

 at the base and produced laterally into prominent angles, 

 thence narrowed sharply. Fifth ventral segment punctured, 

 with obscure longitudinal striae near the apex ; tlie first 

 ventral segment carinate from the base, with a triangular 

 truncation at the apex, the groove between the first and 

 second ventral segments deeply marked. 



Ferruginous brown ; the thorax and median segment 

 fuscous ; the front of the head and the anterior tibige above 

 ochraceous. 



Lengtti 9 mm. 



Bah. Chile. 



Type in B.M. 



This is a true Elaphroptera^ but differs in the much longer 

 median segment and the absence of hair at tiie base of the 

 abdomen from most of the known females. It will probably 

 prove to be the female of E. hyalinipennis^ Spin., but it 

 would be unjustifiable to place it with that species until 

 absolute certainty is attained. 



AripJiron excisus, sp, n. 



? . Head large and moderately flattened, subrectangular, 

 but strongly rounded at the posterior angles, broader than 

 long, sparsely punctured, the vertex shining, the front sub- 

 opaque and minutely punctured between the coarser punctures. 

 The front })rominent between the antennee and bilobed, the 

 antennae inserted near to each other in a space strongly de- 

 pressed below the front, the clypeus also depressed. Eyes 

 very small, almost rouiid, situated near the base of the 

 mandibles, whicli are large and prominent. Pronotum 

 coarsely punctured, much narrower than the head, the 

 median portion longitudinally elevated and A'shaped, pointed 

 on the anterior margin, with a large, deep, smooth excava- 

 tion on each side. Scutellum very narrow ; the raesopleurae 



