146 Dr. H. Hedicke: 
Female. Black, elongate. Head and thorax thickly and 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. Pro- 
thorax quadrate, sides tawny. Metathorax not much developed. 
Petiole very short. Abdomen convex, lanceolate, much longer 
than the thorax; extreme tip yellow. Legs yellow; femora and 
tibiae with an undefined blackish band on each. Wings quite 
eolourless; veins pale yellow; ulna longer than the humerus, stigma 
very small. Length of the body almost 3 lines. 
(Eucca, Italien, A. H. Haliday).“ 
Die Körperlänge dieser Art überschreitet die aller anderen 
Isosomen und wird höchstens von I. giganteum knapp erreicht, 
welche Spezies indessen in Färbung und Gestalt von I. romanım 
erheblich abweicht. Die wesentlichsten Artcharaktere von ro- 
manum sind der relativ schmale Kopf, die fast fadenförmigen 
Antennen, deren Scapus und Pedicellus gelb sind, der an den Seiten 
gelbe, quadratische Prothorax, das am Ende gelbe, mehr als 
thoraxlange Abdomen, die gelben Beine mit undeutlich dunkler 
geringelten Femora und Tibien. Die Art ist somit gut gekenn- 
zeichnet und mit keiner anderen zu verwechseln. 
39. Isosoma semiluteum Walker (1873). 
Isosoma semilutea Walker, Entomologist 6, 1873, p. 396; 
Isosoma semiluteum v. Dalla Torre, Cat. Hvm. V, 1898, p. 349. 
Walkers Diagnose dieser Art lautet: 
„Isosoma semilutea. — Foem. Nigra, caput et thorax sub- 
tilissime punctata; antennae clavatae, basi luteae; prothorax, 
abdomen et pedes lutea; petiolus brevissimus; abdomen fusi- 
forme, thorace paullo brevius; alae diphanae; 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 
moöstly black above. Prothorax, abdomen and legs luteous. Pe- 
tiole very short. Abdomen fusiform, a little shorter than the 
thorax. Wings pellucid; veins white. Length of the body 1" line. 
This species and I. Romana, by the great difference between 
them in the structure of the antennae and of the abdomen, re- 
present the two extremes of the genus. /. semilutea 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 7. Vitis, 
in which the abdomen is luteous beneath towards the base. 
(Lucca, Italien, Haliday).‘ 
Die Art hat mit der mitteleuropäischen Spezies I. fulvicolle 
Walk. große Ähnlichkeit und unterscheidet sich wohl nur durch 
die Gelbfärbung des Abdomens. Walkers Angabe, daß I. semi- 
Iuteum die einzige Spezies sei (mit Ausnahme des amerikanischen 
