MONOGRAPHIA CHALCIDUM. 17 



scarcely longer, and the head is much smaller : in Isos. longu- 

 lum the male and female have very much the same shape, and 

 the former has the larger head. 



July ; amongst grass in fields ; Southgate. 



Sp. 8. Isos. hyalipenne. Fem. Nigrum, prothorace antice 

 maculis duabus pallide flavescentibus, antennis basi Jlaiis, 

 alis hyalinis. 



Caput obscurum : oculi rufo-fusci : thorax punctatus, maculis antice 

 duabus lateralibus pallide flavis : petiolus obscurus, punctatus : 

 abdomen nitidum, glabrum : oviductus apice pallidus : antennae 

 articulo primo apice, tertioque basi, flavis : tibiae anticae fuscse : 

 femorum tibiarumque apices, genua tarsique flavi : alae hyalinae, 

 nervis fulvis. (Alarum longitude, 3 lin.) 



The abdomen is slightly pilose toward the apex : the an- 

 tennae have the apex of the first, and the whole of the ring- 

 shaped third and fourth joints, yellow : the anterior tibiae are 

 fuscous : the tips of the thighs and tibiae are yellow : the 

 four posterior tarsi have the basal joint yellow, the following 

 yellow beneath, with a fuscous line above gradually darker 

 toward the apex : the anterior tarsi are yellow, with the basal 

 and apical joints fuscous : the wings are hyaline, the nervures 

 fulvous: the subcostal nervures of the superior wings are 

 fuscous toward the base. 



July; amongst grass in fields ; Southgate. 



Sp. 9. Isos. longicorne. Mas. Nigrum, prothorace antice 

 maculis duabus albidis, antennis corpori longitudine csquis, 

 alis fuscis. 



Caput obscurum : thorax punctatus, maculis antice duabus late- 

 ralibus albidis : petiolus obscurus, punctatus : abdomen nitidum, 

 glabrum : tibiae anticae fuscae : femorum tibiarumque apices, 

 genua tarsique flavi : alae fuscae. (Alarum longitude, If lin.) 



The body is rather long and narrow : the anterior margin 

 of the proscutellum has an obscure white spot on each side : 

 the abdomen is slightly pilose toward the apex : the antennae, 

 in length, exceed those of any other species in this genus : 

 the tips of the thighs and tibiae are yellow : the anterior 

 tibiae are fuscous : the basal joints of the tarsi are yellow, 

 the apical fuscous : the wings are fuscous. 



July ; amongst grass in fields ; Southgate. 



NO. I. VOL. I. D 



