Mr. Walker^s Descriptions of Chalcidites. 108 



XIV. — Descriptions of some new species of Chalcidites. By 

 Francis Walker, Esq._, F.L.S. 



Isosoma Hordei (Harris MSS.), Mas. Atrum, antenncB nigrce, pedes fulvi, 

 femora piceo-vittata, tarsi flavi, alee limpidcB. 



Corpus atrum, convexum, angustum, sublineare, parum nitens^ scite 

 punctatum, parce hirtum: caput transversum, breve, thorace vix latius; 

 vertex latus ; frons impressa, abrupte declivis : ociili picei, mediocres, non 

 extantes: antennae nigrae, pubescentes,filiformes, graciles, corpore breviores : 

 thorax fusiformis : prothorax magnus, transversus : mesothoracis scutum 

 longitudine latius ; parapsidum suturae bene determinatae, postice approxi- 

 matae ; scutellum subconicum : metathorax sat magnus, declivis, obconicus : 

 petiolus sat longus : abdomen sublineare, nitens, laeve, thorace brevius ; seg- 

 menta 1""' et 2""" magna: pedes fulvi, simplices, subaequales; coxae nigrae; 

 femora piceo-vittata; tarsi flavi, apice fusci : alse limpidce ; squamulae piceae ; 

 nervi fulvi ; nervus humeralis ulnari duplo longior, radialis ulnari multo bre- 

 vier cubitali vix longior, cubitalis sat longus; stigma minutum. (Corp, 

 long. lin. ]^; alar. lin. 2.) 



Parasitic on a species of Cecidomyia. Presented to me by Dr. Harris of 

 Philadelphia. 



Isosoma Laothoe, Fern. Airum, prothoraci maculis genuhusque flavisj 

 tarsis piceis, alis limpidis, 7iervis fulvis, 



Atrum, convexum, punctatum, parce pubescens, parum nitens : caput 

 thorace vix latius : oculi et ocelli picei : antennae graciles, extrorsum cras- 

 siores, thorace paullo breviores : prothorax mesothorace angustior utrinque 

 flavo-maculatus : mesothoracis parapsides extantes, suturae optime determi- 

 natae ; scutellum parvum : metathorax declivis, convexus, carinatus : petio- 

 lus brevis : abdomen fusiforme, nitens, laeve, glabrum, apice acuminatum, 

 thorace vix longius ; segmenta 1"" et 2"" parva ; 3"™ et 4"'" longiora; b^°^ 

 et G"*" breviora : pedes nigri ; genua flava ; tarsi picei : alae limpidae; squa* 

 mulae piceae ; nervi fulvi. (C^orp. long. lin. 1 ; alar. lin. l-^.) 



Taken by Dr. Greville at Juniper Green near Edinburgh. 



Perilampus Entellus, Mas. Viridis, antenncB picece, pedes virides fulvo- 

 cincti, tarsi fulvi, alee limpidce. Fem, Cyaneus, antennce nigrce. 



Mas. Corpus breve, crassum, convexum, viride, nitens, rude punctatum, 

 parce hirtum : caput transversum, breve, thoracis latitudine ; vertex latus, 

 aeneo-varius ; frons cyanea, impressa, fere Isevis, abrupte declivis : oculi rufi, 

 mediocres, non extantes : antennae piceae, longifusiformes, thorace paullo 

 breviores ; articuli valde approximati ; 1"' longus, gracilis, cyaneus : thorax 

 ovatus : prothorax transversus, brevis : mesothoracis scutum longitudine 

 latius; parapsidum suturae non bene determinatae, postice approximatae; 

 scutellum magnum, obconicum, apice elevatum, metathoracem fere obtegens: 

 metathorax transversus, abrupte declivis, postice angustus : petiolus brevis- 

 simus : abdomen lasve, contractum, latitudine vix longius ; segmenta 1"^ et 

 2"" maxima : pedes virides, pubescentes, simplices, subaequales; trochanteres 

 fulvi ; genua fulva ; tibiae apice fulvae ; tarsi fulvi, apice fusci : alae limpidae ; 

 squamulffi piceae ; nervi fusci ; nervus humeralis ulnari plus duplo longior, 

 radialis ulnari paullo brevior cubitali multo longior, cubitalis brevis; stigma 

 minutum . 



Fem. Corpus cyaneum : antennae nigrae: pedes cyaneo-varii. (Corp. long, 

 lin. li— 2; alar. lin. 3—3^.) 



Var. /3. Mas, Tarsi flavi, apice fusci. 



Var. y, Fem. Corpus purpureo-varium. 



Found by R. Forster, Esq. in Ohio. 



