136 Dr. H. Hedicke: 
Taken by Mr. Greville at Juniper Green near Edinburgh.‘ 
So ausführlich die Diagnose zu sein scheint, enthält sie doch 
kaum ein brauchbares Artmerkmal, sie trifft vielmehr auf eine 
ganze Anzahl von Arten zu und könnte ebensogut als Gattungs- 
diagnose von I/sosoma gelten. Die Art muß danach als zweifel- 
haft gelten. 
Isosoma nepe Walker (1844). 
Isosoma nepe Walker, Ann. Mag. Nat. Hist. 14, 1844, p. 212. 
Isosoma nepe Walker, List Spec. Hym. Ins. II, 1848, p. 100. 
Isosoma nepe v. Dalla Torre, Cat. Hym. V, 1898, p. 349. 
Von dieser Spezies gibt Walker nachstehende Diagnose: 
„Isosoma Nepe, mas. Atrum, prothoraci macula utrinque 
fulva, antennis pedibusque nigris, genubus rufis, tarsis piceis, alıs 
subfuscis, nervis piceis. (Corp. long. lin. 1, alar. lin. 1%,). 
Body black, convex, eylindrical: head and thorax punctured: 
head a little broader than the thorax: antennae slender, filiform, 
clothed with long hairs, somewhat shorter than the thorax; first 
joint slightly bent, dilated beneath; second short-cyathiform; 
third and fourth very minute; fifth and following joints to the 
eleventh long, cylindrical, nearly equal in size, or successively, 
vet very slightly shorter and broader; tip of the eleventh joint 
pointed: prothorax very finely rugose, somewhat shining, rather 
broader than long, a little shorter and more slender than that 
of vacillans, from which it differs also in having a smaller pale 
fulvous spot on each fore-corner: mesothorax dull; sutures of 
the parapsides very distinct, approaching each other; axillae 
large, triangular, not conniving; scutellum obconic, having a rim 
round its hind border, which is more obtuse than that of 7. lon- 
gulum, petiolatum, and hyalipenne: metathorax transverse, very 
short: propodeon dull, obconic, decumbent, coarsely punctured, 
and having here and there some large shallow excavations: podeon 
long, stout, cylindrical, dull, punctured; abdomen elliptical, smooth, 
shining, not compressed, scarcely more than half the length of 
the thorax, a little narrower and less convex than that of 7. lon- 
eulum and I. longicorne, metapodeon large, conical, occupying 
about half the dorsum; octoon scarce more than one-fourth of 
the length of the metapodeon;, ennaton much longer than the 
octoon; decaton much longer than the ennaton; protelumi, para- 
telum and telum verv short: legs black; knees fulvous; tarsi 
fuscous, paler beneath: wings slightly fuscous; nervures fuscous; 
humerus much less than half the length of the wing, rejecting 
beneath a short branch; ulna more than half the length of the 
humerus: radius more than half the length of the ulna; cubitus 
a little shorter than the radius; stigma small.‘ 
Für diese Diagnose gilt das bei /. laothoe Walk. (resagte 
gleichfalls: bei aller Ausführlichkeit wird nicht ein einziges Merk- 
mal gegeben, das die Spezies von anderen sicher unterscheiden 
läßt, denn der Hinweis darauf, daß der Hinterrand des Scutellums 
