MONOGRAPHIA CHALCIDUM. 27 



Oculi ocellique rufi : caput antice flavo variegatum : prothorax 

 utrinque flavo maculatus : antennae fuscae, apice subtusque pal- 

 lidiores : femora basi, genua tarsique flavi : pedes antici flavi, 

 femoribus tibiisque fusco maculatis : alae hyalinae : stigma sub- 

 lunaris, fusca, costam versus nigra. (Alarum longitudo, If lin.) 



The principal difference between this species and Dec. bigut- 

 tata, is the prothorax with only two yellow lateral spots, and 

 the entirely black abdomen of the former. 



June ; amongst grass beneath trees ; Southgate. July ; 

 South of France. 



Sp. 4. Dec. immaculata. Mas. Nigra, capite thoraceque 

 immaculatis. 



Oculi ocellique rufi : abdomen basi rufum : antennae fuscae, apice 

 pallidiores : femora basi, genua tarsique flavi : pedes antici flavi, 

 femoribus tibiisque fusco maculatis : alae hyalinae : stigma sublu- 

 naris, fusca, costam versus nigra. (Alarum longitudo. If lin.) 



July ; amongst grass beneath trees ; Southgate. 



Sp. 5. Dec. plana. Fem. Nigra, flavo variegata, mesotho- 

 race immaculato, ahdomine bimaculato. 



Oculi ocellique rufi : caput et prothorax flavo variegati : abdomen 

 maculis duabus lateralibus rotundatis parvis flavis : antennae 

 fuscae, apice pallidiores : pedes flavi : femora tibiaeque 4 posticae 

 nigro, anticae fusco maculatae : alae hyalinae : stigma sublunaris, 

 fusca, costam versus nigra. (Alarum longitudo, 1§ lin.) 



This species is nearly allied to Dec. biguttata : it is smaller, 

 more slender, and less variegated with yellow : the mesothorax 

 is entirely black. 



July ; amongst grass beneath trees ; Southgate. 



Sp. 6. Dec. mellea. Fem. Flava, nigro variegata. 



Oculi ocellique rufi : caput postice, post-scutellum antice, meso- 

 thoracis linea transversa, metathorax, abdominis maculae 3 con- 

 nectse dorsales petiolusque nigri ; antennarum articulus 2 supra 

 fuscus: alae hyalinae: stigma sublunaris, fusca, costam versus 

 nigra. (Alarum longitudo, if — If lin.) 



Var. — Antennae fuscae : tibiae 4 posticae fusco maculatae. 



May ; amongst grass beneath trees ; Southgate. Septem- 

 ber ; Isle of Wight. 



