Beiträge zu einer Monographie her paläarktischen Isosominen 147 
I. vitis), trifft nicht zu, da mehr ‘oder weniger umfangreiche Bräu- 
nungen des Abdomens bei sehr vielen Arten zu konstatieren ist. 
Dagegen ist bei dem in dieser Beziehung gleichfalls variablen 
I. fulvicolle das Abdomen nie so hell gefärbt wie der Prothorax. 
DieArtmuß demnach alsgenügend gekennzeichnet angesehen werden. 
40. Isosoma luteicolle Walker (1873). 
Isosoma luteicollis Walker, Entomologist 6, 1873, p. 397. 
Isosoma luteicolle v. Dalla‘ Torre, Cat. Hym. V. 1898, p. 348. 
Walkers Diagnose dieser Art hat folgenden Wortlaut: 
„Isosoma luteicollis. -- Mas. Nigra; caput et thorax subtilis- 
sime punctata; caput prothorace multo latius; antennae filiformes, 
bası luteae; prothorax luteus; petiolus longissimus; abdomen fere 
lineare; pedes lutescentes, femoribus tibiisque nonnumquam ex 
parte nigricantibus; alae subcinereae, nigricante venosae. 
. Male. Black. Head and thorax shining, very finely punc- 
tured. Head much broader than the prothorax. Antennae fili- 
form, rather shorter than the body; first and second joint luteous. 
Prothorax luteous. Metathorax well developed. Petiole very long. 
Abdomen nearly linear, together with the petiole not longer than 
the thorax. Legs lutescent; femora and tibiae occasionally blackish; 
humerus longer than the ulna. Length of the bedy 1! line. 
It can hardly be compared with 7. flavicollis and with I. /ulvi- 
collis, as no male of these two species has yet been discovered in 
England; the longer petiole and the darker wing veins indicate 
thath it is specifically different from both of them. 
(Lucca, Italien, Haliday).‘ 
Diese Spezies kann, wie Walker mit Recht behauptet, nicht 
als Männchen zu einer der bekannten Arten mit gelbem Prothorax 
gestellt werden, da diese sämtlich durch sehr hell gelbliches Flügel- 
geäder ausgezeichnet sind und einen schuppenförmigen, sehr kurzen 
Petiolus besitzen. Sie muß somit als gute Art gelten. 
41. Isosoma insolitum Walker (1873). 
Isosoma insolita Walker, Entomologist 6, 1873, p. 397; 
Isosoma insolitum v. Dalla Torre, Cat. Hym. V, 1898, p. 348. 
Walkers Beschreibung hat folgenden Wortlaut: 
„[sosoma insolita. — Foem. Nigra; caput et thorax subtiliter 
punctata; caput prothorace paullo latius; antennae subelavatae, 
thorace multo breviores; prothorax immaculatus; petiolus lon- 
giusculus; abdomen postice sublatescens, thorace multo brevius; 
alae diaphanae, nigricante venosae. Mas. ? — Antennae filiformes; 
abdomen longi-fusiforme. 
Female. Black, slender, shining. Head and thorax finely 
punctured. Head a little broader than the prothorax, which is 
moderately developed, and has no trace of the two pale- spots 
which are very generally characteristic of this genus. Antennae 
subclavate, wholly black, much shorter than the thorax; club 
fusiform, more than twice as long as the preceding joint. Meta- 
thorax well developed. Petiole rather long. Abdomen slightly 
10* {1. Heft 
