28 Mr. F. Smith on some new species of Exotic Hymenoptera. 



locality mentioned by Mr. Clark, I may add Sandwich and Wey- 

 mouth ; and Mr. Barlee has also found it on the west coasts of 

 Scotland and Ireland. It is however a very rare and well-marked 

 shell. 



I amj Gentlemen, your obedient servant, 



J. GwYN Jeffreys. 

 Norton near Swansea, Dee. 8, 1850. 



IV. — Descriptions of some new species of Exotic Hymenoptera 

 in the British Museum and other Collections. By Frederick 

 Smith, Assistant in the Zoological Department of the Bri- 

 tish Museum. 



Genus Trigonalys, "Westw. 



T. bipustulafa, n. sp. 



Male (length 7 lines) black : head as wide as the thorax, 

 quadrate, smooth and shining, covered with a thin short black 

 pubescence, the clypeus emarginate in front; antennte seta- 

 ceous, 20-jointed, the apical eight joints gradually attenuated to 

 a point ; thorax closely and deeply punctured, the punctures 

 confluent ; the metathorax has a deep longitudinal channel 

 in the centre, and its apex is clothed with pale pubescence ; the 

 tibiae and tarsi very dark ferruginous, the legs are entirely clothed 

 with short fuscous pubescence ; wings hyaline, the anterior 

 margin of the superior wings has a dark fuscous longitudinal 

 cloud, covering the externo- and interno-medial, the first dis- 

 coidal, the marginal, and the first, second and third submarginal 

 cells; the posterior wings are also clouded at their anterior 

 margin which gradually shades ofi" towards that of the posterior ; 

 abdomen very closely punctured — the basal segment above has 

 two pale yellow lateral spots, between which is a deep broad 

 groove from the base to the apex ; beneath, the basal segment 

 is pale yellow, except a small portion at its base. 



Hab. Brazil. 



This species is in the collection of W. W. Saunders, Esq., and 

 is the largest which I have yet seen of this rare genus. 



Note. — The neuration of the wings in this species differs con- 

 siderably from that of the type of the genus, T. melanolcuca, the 

 second submarginal cell is more elongate, and the third instead 

 of being quadrate is oblong. 



T. maculata, n. sp. 



Male (length 4i lines) black : the head quadrate, closely and 

 rather deeply punctured, the clypeus transverse, emarginate in 

 the centre of its anterior margin ; it is yellow and has a black 



