MONOGRAPHIA CHALCIDUM. ,15 



pilose toward the apex : the tip of the ovipositor is yellow: 

 the antennas are black, the base of the first joint fuscous : the 

 antennae of the male are as long as three-fourths of the body, 

 those of the female are much shorter : the thighs are smooth 

 and shining above, beneath dull, punctured : the four posterior 

 tibiae are dark fuscous, the anterior are paler, yellow beneath : 

 the knees and extremities of the tibiae are yellow: the tarsi are 

 fuscous, the anterior darker than the four posterior: the wings 

 are slightly fuscous, the nervures darker. 



This species is common at Southgate, amongst grass on the 

 banks of ditches, in the months of March, April, and May. 



Sp. 3. Isos. fumipenne. Fem. Nigrum, prcecedenii brevins 

 et crassius, prothorace antice maculis duabus 'pallide, flavis , 

 aUsfumosis. 



Caput obscurum : thorax punctatus, maculis antice duabus late- 

 ralibus pallide flavis : petiolus obscurus, punctatus : abdomen 

 nitidum, glabrum : oviductus apice flavus : antennae basi fuscae : 

 tibiae tarsique fusci : genua tibiarumque apices flavi : alae fu- 

 mosse. (Alarum longitudo, 3 lin.) 



This species is shorter and broader than the preceding, 

 which it much resembles : the wings are darker. 

 July; on grassy banks ; Southgate. 



Sp. 4. Isos. crassicorne. Fem. Nigrum, prcecedenti brevius, 

 prothorace antice macidis duabus flavis, antennis rufo-cinc- 

 tis, alis subfuscis. 



Caput obscurum : thorax punctatus, maculis antice duabus late- 

 ralibus flavis : petiolus obscurus, punctatus : abdomen nitidum, 

 glabrum : oviductus apice flavus : antennarum articulus primus 

 apice, tertiusque basi, rufo-fusci : tibiae nigro-fuscae : genua tarsi- 

 que rufl: alae subfuscae. (Alarum longitudo, if — 2 lin.) 



The body of this species is rather shorter than that of Isos. 

 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 toward 

 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. 



