MONOGRAPHIA C'lIALCIDlTUM. 153 



Genus, Isosoma, Walker. 



Sp. 24, Isos. flavicolle. Fem. Nigrum, prothorace pedi- 

 husque jlavis, his nigro variegatis, alis subhyalinis. 



Isos. fulvicolli similis, difFert abdomine alisque longioribus. Nigrum, 

 obscuram, punctatum, pubescens : caput thorace latius : oculi 

 ocellique obscure rufi : mandibulse rufo-fuscse : antennae nigrae, 

 pubescentes, thorace breviores ; articulus 1"^. rufus ; 2"*. apice 

 fuscus : thorax elongatus, angustus : prothorax flavus, utrinque 

 antice pallidior, postice nigro-fuscus, supra fusco vittatus : squa- 

 mulse nigro-fuscae : petiolus brevis : abdomen angustum, glabrum, 

 nitidissimum, thorace vix brevius, apice elevatum et supra pla- 

 num : oviductus subexertus, rufus : pedes rufi ; coxae fuscae ; 

 procoxae flavae, supra fusco maculatae ; profemora supra ad basin 

 nigra ; mesofemora nigra, metafemora fusca, ambas apice rufa ; 

 mesotibia; nigro-fusco, metatibise fulvo late fasciatae ; meso- et 

 metatarsi pallide rufi, apice fusci : alae subhyalinse, pallide fla- 

 vescentes ; nervi flavi ; stigma parvum. (Corp. long. 1| — 1§ 

 lin. ; alar. 2|— 2^ lin.) 



Var. /3. — Antennae articulo 1°. fusco : trochanteres fusci ; femora 

 omnia basi nigra ; meso- et metatarsi flavi, apice fusci : alas vix 

 flavescentes. 



July ; on grass beneath trees ; near London. 



Genus Systole, Walker. 



Sp. 2. Syst. platyptera. Fem. Nigra, alis subhyalinis. 



Lata, nigra, obscura, punctata, pubescens : caput thorace latius : 

 oculi ocellique obscure rufi : antennae nigrae, pubescentes, thorace 

 pauUo breviores : thorax crassus, fere gibbus ; squamulae nigrae, 

 nitidse : petiolus brevissimus : abdomen ovatum, glabrum, niti- 

 dissimum, thorace brevius et angustius : oviductus rufus, sub- 

 exertus : pedes nigri, pubescentes ; genua flava ; protarsi rufi ; 

 meso- et metatarsi flavi, apice fusci : alae latae, subhyalinae ; 

 nervus solitus fuscus, ubi costam percurrit crassus ; stigma par- 

 vum. (Corp. long. I lin. ; alar. \\ lin.) 



July ; on grass in fields ; near London. 



NO. II. VOL. II. 



