- 
128 Dr. H. Hedicke: 
Caput obscurum: thorax punctatus, maculis duabus latera- 
libus flavis: petiolus obscurus, punctatus: abdomen nitidum, 
glabrum: oviductus apice flavus: antennarum articulus primus 
apice, tertiusque basi, rufo-fusci: tibiae nigrofuscae: genua tar- 
sique rufi: alae subfuscae. (Alarum longitudo, 1?/;—2 lin.) 
The body of this species is rather shorter than that of /sos. 
fumipenne, which it much resembles in shape: the antennae are 
thicker in proportion, and more clavate: the abdomen is smooth, 
shining, very finely punctured, slightly pilose towards the apex: 
excepting the red colour of the extremities of the first, and the 
whole of the ringshaped third and fourth joints, the antennae 
are black: the wings are slightly fuscous, the nervures darker. 
June; amongst grass in fields; Southgate. “ 
Isosoma tenuicorne Walker (1832). 
Isosoma tenwicorne Walker, Ent. Mag. I, 1832, p. 19; 
Isosoma tenuicorne Walker, List Spec. Hym. Ins. II, 1848, p. 100; 
Isosoma tenuicorne v. Dalla Torre, Cat. Hym. V, 1898, p. 350. 
Walkers Originaldiagnose hat folgenden Wortlaut: 
„Isos. tenuicorne. Mas. Nigrum, prothorace antice maculis 
duabus albidis, antennis gracilibus, alis subhyalinis. 
Caput obscurum: oculi ocellique rufi: thorax punctatus, 
maculis antice lateralibus duabus albidis: petiolus obscurus, 
punctatus: abdomen nitidum, glabrum: tibiae anticae nigro- 
fuscae: genua flava: tarsi fusci: alae subhyalinae, nervis pallide 
fuscis. (Alarum longitudo, 1 lin.) 
It has much resemblance in form to /sos. elongatum: it is 
narrower in proportion, and smaller: the antennae and wings 
are more slender. 
May; grass in fields; Southgate.‘“ & 
Die Type dieser Art liegt nicht vor, der Hinweis auf die Ahn- 
lichkeit mit /. elongatum, welche Spezies wiederum mit I. angusti- 
penne Walk. nach des Autors eigener Angabe synonym sein soll 
(22, p. 11, I. minor Walk. ist, wie oben dargelegt, synonym zu 
angustipenne Walk.), könnte bei etwaigem Wiederauffinden der 
Art genügen, um sie zu identifizieren. 
Isosoma pusillum Walker (1832). 
Isosoma pustillum Walker, Ent. Mag. I, 1832, p. 20. 
? Eurytoma Pusilla Boheman, Svenska Vet.-Ak. Handl. 56, 1835, 
p- 252. 
Isosoma pusillum‘ Walker, List Spec. Hym. Ins. II, 1848, p. 100, 
Isosoma pusilla Thomson, Hym. Scand. IV, 1, 1875, p. 58. 
Walker gibt von dieser Spezies folgende Beschreibung: 
„Isos. pusillum. Mas. Nigrum, prothorace antice maculis 
duabus albidis, alis subfuscis. 
Caput obscurum: oculi ocellique rufi: thorax punctatus, 
maculis antice duabus lateralibus albidis: petiolus obscurus, 
punctatus: abdomen nitidum, glabrum; tibiae nigro-fuscae: tarsi 
fusci: genua flava: alae subfuscae. (Alarum longitudo, 34 lin.) 
