Mr. Walker's descriptions o/Chalcidites/rom Valparaiso. 113 



of a Crinoid. It is further remarkable by deviating from the 

 quinary type so prevalent in the Echinodermata : the lobes 

 and ambulacra of this new genus are each four in number. 



We have taken the number and arrangement of the plates 

 surrounding the body as the leading characters on which to 

 found our genera, as we have the variations in their form and 

 other observable peculiarities, together with the number of 

 rays or arms to distinguish the different species. Though the 

 mouth of some of our species is central and but slightly pro- 

 trusive, and in others it assumes the form of an elongated pro- 

 boscis, yet we have not at present deemed this difference suf- 

 ficient to found new genera on, when the plates surrounding 

 the body agree in number, shape and general arrangement ; 

 nor have we separated those with the mouths placed laterally, 

 if the other points coincide generally. Had these characters 

 been acted on, we must have divided some long-established 

 genera into no less than three, each differing in this particular. 

 The question is however under consideration as to the pro- 

 priety of continuing the present arrangement in the cases al- 

 luded to. 



XIX. — Descriptions of Chalcidites discovered by C. Darwin, 

 Esq., near Valparaiso* By Francis Walker, F.L.S. 



Torymus Phormio, Fem. Viridi-aneus, antenna nigra, pedes rufi, femora 

 viridia, alee sublimpida. 



Corpus viridi-aeneum, convexum, nitens, scite squameum, parce pubescens : 

 caput transversum, breve, thorace vix latius ; vertex sat latus ; frons abrupte 

 declivis, excavata : oculi rufi, mediocres, uon extantes : antennae nigrae, sub- 

 clavatae, pubescentes, thorace paullo breviores ; articuli approximati : thorax 

 longi-ovatus : prothorax transversus, mediocris, antice non angustior : meso- 

 thoracis scutum latitudine paullo longius ; parapsidum suturae bene deter- 

 minatae, postice approximatae ; scutellum subovatum : metathorax mediocris, 

 declivis, obconicus : petiolus brevissimus : abdomen longi-ovatum, subcom- 

 pressum, subtus carinatum, thorace paullo brevius : oviductus exertus, rufus ; 

 vaginse nigrae, abdomine vix breviores : pedes pallide rufi ; coxse virides ; 

 femora viridia ; ungues et pulvilli fusci ; metafemora subtus unidentata, 

 metatibiae pallide fuscae, apice spina longa arcuata armatae : alae sublim- 

 pidae ; squamulae piceas ; nervi fusci ; nervus humeralis ulnari fere duplo 

 longior; radialis ulnari brevior, cubitalis brevissimus; stigma minutum. 

 (Corp. long. lin. 1§ j alar. lin. 2-| .) 



Callimome Nonacris, Fem. Viridi-cyaneus, antenna nigra, pedes fusci, 

 femora viridia, ala sublimpida. 



Corpus viridi-cyaneum aeneo-varium, convexum, scite squameum, parum 

 nitens, parce pubescens : caput transversum, breve, thoracis latitudine ; ver- 

 tex sat latus ; frons abrupte declivis : oculi rufi, mediocres, non extantes : 

 antennae nigrae, validae, clavatae, pubescentes, thorace non longiores : thorax 

 longi-ovatus: prothorax sat magnus longitudine paullo latius, antice angus- 

 tior: mesothoracis scutum latitudine paullo longius; parapsidum suturae 

 bene determinatae, postice approximatae ; scutellum subovatum : metathorax 



Ann. $ Mag. N. Hist. Vol.x. I 



