MONOGRAPHIA CHALCIDITUM. 203 



aureum ; discus cupreo micans : sexualia fulva : pedes laete flavi ; 

 coxas virides ; meso- et metatarsi pallidiores, apice fulvi : alae 

 limpidissimae ; squamulae et nervi flava, illae apice fuscae ; stigma 

 fulvum, parvum. 



Fern. — JEneo-viridis, parum nitens : palpi fusci, basi viridi-fusci : 

 antennae nigrae ; articulus l lls . fulvus, apice nigro-fuscus : abdomen 

 viridi-seneum ; discus obscure cupreus ; segmentum l um . laete 

 viride, cupreo varium : oviductus rufus ; vaginas nigrae : pedes 

 fusci ; coxae aeneo-virides ; femora viridi fusca ; genua, tibiae apice 

 tarsique flava, hi apice fusci ; protibiae fusco-fulvae ; protarsi 

 fulvi : alarum squamulae et nervi fulva, illae apice fuscae ; stigma 

 pallide fuscum. (Corp. long. lin. § — 1^ ; alar. lin. \\ — 2.) 



Var. (j. — Mas, thorax aeneo varius. 



Var. y. — Mas, antennas fulvas ; articulus 2 US . intus fuscus ; se- 

 quentes apice basique minime fuscae. 



Far. £. — Mas, thorax supra cyaneo-viridis. 



Far.e. — Mas, antennae fusco-fulvae ; articulus l us .flavus, apice fulvus. 



Far. £. — Fern, caput viride : abdomen aeneum ; segmenta basi viridia. 



Var. r\. — Fern. Far j3, similis : thorax viridis. 



Far. d. — Fern, tibiae flavae ; meso- et metatibiae fulvo fasciatae. 



Far. k. Fern, abdomen aeneo-viride, basi ad medium cupreum. 



Var. i. — Fern, abdomen aeneum ; segmentum l um .viride,basi cupreum. 



Far. A. — Fem. caput et metathorax viridia. 



Far. fi.- — Fem. antennae articulo 1°. fusco, basi fulvo ; meso- et meta- 

 tarsi basi flavi. 



Described from specimens found near London, or sent to 

 me from Paris, by the Comte de Castelneau. It is very 

 abundant in Europe during the summer, infesting butterflies 

 (Vanessa and Pontia) while in the chrysalis state. The fly 

 appears in three weeks after the egg is laid. The relative 

 number of males and females in a chrysalis is very variable. 

 I once had a bright gold-coloured chrysalis of Vanessa Poly- 

 chloros. In a few days its metallic hue changed to a dead 

 yellow, that became gradually darker. I then opened it and 

 found it full ofpupce. Their colour was pale, but soon turned 

 to black, and then to a metallic green. They employed their 

 legs, particularly the fore-pair, to divest themselves of their 

 covering. Twenty males first came to maturity in the morn- 

 ing, and twenty more, and one female, in the afternoon of the 

 same day. On the following day, thirty-nine males and four- 



