22 MONOGRAPHIA CIIALCIDUM. 



in this species than in any of the preceding : the wings are 

 long and rather broad. 



July ; amongst grass in fields ; Southgate. 



Sp. 22. I SOS. lineare. Fern. Nigrum, prothorace antice ma- 

 cuUs duabus albidis, tarsis flavis , alls hycd'mis. 



Caput obscurum: thorax punctatus, albido utrinque antice macii- 

 latus : petiolus obscurus, punctatus : abdomen nitidum, glabrum : 

 antennarum scapus fuscus : femora antica apicem versus, genua 

 tarsique flavi : tibiae anticae fuscae : alae hyahnse, nervis flavis. 

 (Alarum longitude, I2 lin.) 



This species has more slender antennae than Isos. angusta- 

 tum, which it resembles in shape, but the body is longer and 

 narrower : the abdomen is slightly compressed : the white 

 spot on each side of the proscutellum is rather large : it is 

 more linear than Isos. depressum, and has much shorter wings. 



July ; amongst grass in fields ; Southgate. 



Sp. 23. Isos. attenuatum. Fem. Nigtnim, prothorace antice 

 maculis duabus albidis, tarsis atdlcis fuscis, alis hyalinis. 



Caput obscurum : thorax punctatus, albido utrinque antice macu- 

 latus : petiolus obscurus, punctatus : abdomen nitidum, glabrum: 

 antennarum scapus fuscus, basi flavus : pedes flavi, femoribus 

 tibiisque 4 posticis nigris : femora basi, tibiae apice, tarsique 

 antici, fusci : alae hyalinte, nervis pallide flavis. (Alarum longi- 

 tudo, li lin.) 



It is very similar to the preceding species, but the body is 

 longer and narrower : the white spots on the proscutellum are 

 larger : the abdomen is more compressed : the antennae are 

 shorter, and more clavate : and the wings are much narrower. 



July ; amongst grass in fields ; Southgate. 



Genus II. Systole*^, Walker. 

 Fem. Caput magnum: antennas 12-articulatag, breves, submonili- 

 formes, clavatse apice acuminatae : thorax convexus : abdomen 

 breve, cylindricum. 



Sp. I. Syst. albipennis. Fem. nigra, alis albis. 



Oculi ocellique rufi : antennae apice nigro-fuscae : caput, thorax, 

 et petiolus obscuri, punctati : abdomen nitidum, glabrum : tibiae 



"^ ffu<jT0\7], cunlracdo. 



