MONOGRAPHIA CHALCIDITUM. Z» < 



palpi plerumque simplices, mart rarissime dilatati aut fissi : 

 antennae articulis 13, nonnunquam 12, rarissime 11, mari ple- 

 rumque filiformes corporis longitudine, fern, plerumque clavatse. 

 corpore breviores, simplices, plus minusve pubescentes ; articuli 

 approximati, sublineares ; 1^**. longus ; 2"*. cyathiformis ; clava 

 triarticulata : thorax varius : mesothorax plerumque ejus fere 

 totum occupans : abdomen sessile, quasi subtilissime squameum, 

 supra planum, maris rotundum lineare aut spathuliforme, fem. 

 ovatum sublineare aut basi latum inde ad apicem gradatim acumi- 

 natum : oviductus carinula ventrali receptus, nonnumquam sub- 

 exertus et vaginis duabus lateralibus reconditus : pedes mediocres, 

 sub-aequales, pubescentes ; coxse parva; ; tibiae rectae, apice spinis 

 armatae, mari nonnunquam dilatatas ; tarsi graciles, articuli P. ad 

 4"™. longitudine decrescentes ; 5"*. 4°. longior ; ungues et pulvilli 

 parvi : alee plerumque amplae, pubescentes, iridescentes ; pro- 

 alae nervo unico solito, cujus humeralis ulnari longior, radialis sat 

 longa stigmate terminata ; metalae nervo unico simplici, costse 

 medium attingente. 

 Metamorphosin in Lepidopterorum, aut rariiis Muscidum et Tenthre- 

 dinidum, pupis subeunt; nonnullas ad Cleonymum propinquae 

 Coleoptera lignivora {Anobium Hylurgum et Hylesinum) diruunt. 

 Mares saepe colore Iseto abdomineque flavo maculato gaudent ; 

 femince obscuriores, abdomine rarissime maculato. Characteres 

 quibus Chaleiditum tarsis 5 articulatis familise discrepant breviter 

 memorabo. Spalangiidum caput planum ; Eurytomidwm corpus 

 gibbosum aut cylindricum ; Chalcididum et Leucopsidum meta- 

 femora incrassata ; Torymidum et Perilampidum nervus cubitalis 

 brevissimus ; Miscogasteridum abdomen petiolatum ; Ormoceridum 

 antennae moniliformes ; Pteromalidum abdomen sessile et planum ; 

 Cleonymidum thoracis structura propria ; Ewpelmidum et Encyr- 

 tidum mesotarsi dilatati; Aphelinidum antennae articulis paucis. 



The genus Pteromahis was named and characterized by 

 Swederus in the Stockhohn Transactions, where fifteen species 

 are described, which, with the exception of two or three, have 

 been since removed to other genera. His first species, P. 

 imparmn, is very abundant, and has been often described by 

 entomologists : from one to two hundred specimens of it are 

 found in a single chrysahs of the common white or tortoiseshell 

 butterfly {Pontia Brassicce and Vajiessa Urticce). It is often 

 difficuk to identify the species of this family, for the males and 

 females generally differ entirely in form and colour, and, like 

 the Ichneunionites, the latter are either the most numerous 



