396 THE ENTOMOLOGIST. 



apice flavum, thorace multo longius ; pedes flavi, femoribus 

 tibiisque nigricante subfasciatis ; alae diaplianoe, venis pallide 

 flavis. 



Female. Black, elongate. Head and thorax thickly aud 

 rather roughly punctured. Head as broad as the prothorax. 

 Antennae slender, almost filiform; first and second joints 

 yellow, following joints fusiform, setulose; club composed of 

 three distinct joints, which together are rather longer than 

 the preceding one. Prothorax quadrate ; sides tawny. 

 Metathorax not much developed. Petiole very short. 

 Abdomen convex, lanceolate, much longer than the thorax ; 

 extreme lip yellow. Legs yellow; femora and tibiae with an 

 undefined blackish band on each. Wings quite colourless ; 

 veins pale yellow; ulna longer than the humerus; stigma 

 very small. Length of the body almost 3 lines. 



The three following species are also Italian, and were 

 found near Lucca, and there A. H. Haliday discovered 

 Philach}ra, which may be associated with Isosoma, for the 

 male does not differ from the latter in character, though in 

 the female the structure of the thorax is modified on account 

 of the undeveloped wings. 



Isosoma semilutea. — Fcem. Nigra; caput et thorax sub- 

 tilissime punctata; antennae clavatae, basi luteae; prothorax, 

 abdomen et pedes lutea; petiolus brevissimus; abdomen 

 fusiforme, thorace paullo brevius ; alae diaphanae ; albo 

 venosae. 



Female. Black. Head and thorax very finely punctured. 

 Head broader than the prothorax. Antennae clavate, much 

 shorter than the thorax ; first and second joints luteous, the 

 latter mostly black above. Prothorax, abdomen and legs 

 luteous. Petiole very short. Abdomen fusiform, a little 

 shorter than the thorax. Wings pellucid ; veins white. 

 Length of the body \^ line. 



This species and I. Romana, by the great difference 

 between them in the structure of the antennae and of the 

 abdomen, represent the two extremes of the genus. L semi- 

 lutea agrees most with the two British species that are 

 distinguished like it by a luteous prothorax, but the abdomen 

 is shorter, and it is the only species in which that part is not 

 wholly black, excepting L Vitis, in which the abdomen is 

 luteous beneath towards the base. 



