Mr. C. O. Waterhouse on neio Longicorn Goleoptera. 421 



■vvheuce a slight costa commences and extends into the black 

 fascia. The pro- and mesosterna and the abdomen are nearly 

 black. 



DiADELiA, n. gen. 



Antennae longer than the whole insect, slender ; the basal 

 joint elongate, nearly cylindrical, as long as the length of the 

 thorax ; the second and third joints together as long as the 

 lirst, the foiu'th joint one third longer than the third, the fol- 

 lowing joints rather shorter and sixbequal. Antennal tuber- 

 cles slightly raised and widely separated. Thorax transverse, 

 angularly enlarged at the middle, and furnished with a strong, 

 not very acute, tubercle ; there is a slight swelling immedi- 

 ately beliind the anterior angles ; and on the disk there are two 

 moderately distinct obtuse tubercles. Scutellura of moderate 

 size. Elytra at the base nearly twice as broad as the base 

 of the thorax, and four and a quarter times the length, gradu- 

 ally but considerably narrowed posteriorly, distinctly flattened 

 at the suture } the lateral margin incrassate and very clearly 

 defined ; the apex of each elytron obliquely truncate. Inter- 

 coxal process of the prosternum rather narrower and arched. 

 The mesosterum a trifle broader, almost conically produced 

 anteriorly, perpendicular in front. Apical segment of the 

 abdomen flat, trapezoidal, gently emarginate at the apex. 



The female has the antennas only a little longer than the 

 whole insect ; in the male they are much longer. 



This genus should be placed next to AmblestMs^ Th., from 

 which tiie form of the mesosternum will alone be sufficient 

 to distinguish it. 



Diadelia hiplagiata, n. sp. 



Fusca, pube fusca griseaquc dense vestita ct variegata ; elytris pube 

 grisea vestitis, plaga communi basali triangulari et altera lateral! 

 fuscis. 



Long. 7 5 lin. 



The mixture of grey and brown pubescence on the underside 

 of the insect and on the legs is about equal ,• but on the 

 abdomen the grey prevails largely. The grey colour on the 

 head and thorax is less conspicuous ; and the antennae are 

 almost entirely brown. The elytra are pale greyish, Vvith the 

 base brown 5 and on each elytron, about the middle of the 

 side, is a large brown patch, somewhat trapezoidal in form 

 but rounded towards the suture ; halfway between this and 

 the apex there is a slightly oblique dusky line ; there is a 

 line of pale brown dots along the suture ; and a little way 

 removed from the suture another similar line may be traced 



