498 Mr. R. E. Turner on the 



tenuicornis^ Sm., described from Arn, is a Thynnus^ coming 

 near the subgenus Aeolothr/nnus, Aslnnead. 



The species described in the present paper are mostly from 

 specimens in the British J\Iuseum collection. 



Myzine diffinis, sp. n. 



^ . Mandibles with a fringe of fine white pubescence on 

 the outer margin near the base ; the clypeus truncate broadly 

 at the apex and sparsely punctured. Head rather small, 

 rounded and narrowed behind the eyes, the vertex finely 

 punctured, the front rugose ; eyes broadly and shallowly 

 emarginate, ocelli rather large ; front between the antennas 

 prominent and transverse. Antennse as long as the six 

 basal segments of the abdomen, much more slender than is 

 usual in the genus ; the scape short, very little longer than 

 the second joint of the flagellum ; the first joint of the flagel- 

 lum concealed by the scape, the second a little more than 

 half as long as the third. Thorax rather closely punctured, 

 the anterior margin of the pronotum transverse^ with long 

 greyish pubescence, the posterior margin almost smooth ; 

 the scutellum shining and sparsely punctured ; propleurge 

 finely and sparsely, mesopleurse coarsely punctured. Median 

 segment short and transversely rugose. Abdomen shining 

 and very sparsely punctured, with very sparse, short, grey 

 pubescence; longer than the head, thorax, and median 

 segment combined, the spine of the hypopygium only feebly 

 recurved. The posterior tibise are nearly as long as the two 

 basal joints of the tarsi combined. The neuration does not 

 extend quite to the outer margin of the wing; the stigma is 

 large, long, and straight ; the radial cell broad, extending far 

 beyond the third cubital cell and rounded at the apex; the 

 second cubital cell half as long again as the third on the 

 radial uervuie and more than half as long again as the third 

 on the cubital nervure ; the first recurrent nervure is received 

 at the middle of the second cubital cell, the second at the 

 middle of the third. The second transverse cubital nervure 

 is straight, the third oblique and slightly curved outwardly; 

 the third cubital cell is much higher than its length on the 

 cubital nervure and very short on the radial nervure. 



Black ; the mandibles (except at the apex), clypeus, the 

 apex of the interantennal prominence, the anterior margin of 

 the pronotum narrowly, the posterior margin broadly, a 

 transverse mark near the middle of the mesonotura, the 

 tegulge, a vertical line on the mesopleuree in front, a narrow 

 band (broadened in the middle and again more strongly on 



