MONOGRAPHIA CHALCIDUM. 375 



In this, and in many other Hymenopterous genera, the 

 petiole appears divided ; but as the terms of the abdominal 

 segments are not yet well defined, I have called both divisions 

 the petiole. — See Latreille, Cours d'Entomologie, Tom. I. 

 p. 231. 



Sp. 1. Pro. ater. Mas. Ater, antennis fuscis, pedibus 

 fiavis, alls hyalinis. 



Caput punctatum, obscunim : oculi nigro-fusci : ocelli rufo-fusci : 

 thorax obscurus, punctatus ; latera laeviora, nitidiora : meso- 

 thoracis paraptera nigro-aenea : metathorax et petiolus minime 

 punctati : abdomen nitidum, glabrum : antennae pallide fuscae ; 

 articulus V\ flavus : femora posticae fusco maculata ; tarsi apice 

 fusci, 4 postici straminei : alae hyalinae ; nervi flavi ; stigma 

 parvum, concolor. (Alarum longitudo, 1| lin.) 

 June ; on a window ; near London. 



Genus. V. — Merismus,"^ Walker. 

 Caput magnum, thorace paull6 latius : mandibulae rectae, dentibus 

 4 parvis armatae : maxillae elongatas, apicem versus interne in 

 lobum productae : palpi maxillares 4-articulati ; V\ et 2"^ sequales ; 

 3"'. longior ; 4"'. elongatus, acuminatus : mentum elongatum, 

 postice conicum : labium elongatum, antice rotundatum : petiolus 

 elongatus : abdomen /em. ovatum, supra con vexum, apice abrupte 

 elevatum et acuminatum : pedes graciles ; tibiae rectae. 

 The trophi are described from M. aculeatus. 



Divisio I. 



Thorax ovatus, postice latior : prothoracis scutellum mediocre : 

 mesothoracis scutum mediocre, suturae vix conspicuae ; scutellum 

 latum, convexum ; epimera et paraptera distincta : metathoracis 

 scutellum magnum : petiolus postice angustior : maris abdomen 

 ovatum, gibbum, apice subtruncatum ; segmentum 2""". magnum ; 

 3""". maximum ; sequentia brevissima : fern, abdomen elongato 

 ovatum : antennae maris extrorsum crassiores, fern, sub-clavatae, 

 13 -articulates ; l"^ elongatus ; 2''\ cyathiformis ; 3"'. et 4"'. bre- 

 vissimi; 5°% et sequentes ad 10™. aequales ; clava triarticulata, 

 elongato ovata, articulis 2 praecedentibus sequalis. 



Sp. 1. Mer. aculeatus. Mas et fem. Viridis, antennis, 



nigris, pedibus Jlavis, alis hyalinis. 

 Caput punctatum : oculi rufo-fusci : ocelli rufi : antennae nigrae ; 



articulus 1"'. viridis, basi fuscus ; 2"'. aeneus : thorax punctatus : 



'^ M^piffixos divisio. 



