38. 

 HEDYCHllUM ARDENS. 



Order Hymenoptera. Faim, Chrysididae Lat..^ Leach. 



Type of the Genus C. violaceum Rossi. 



Hedyciirum Lat., Leach. Chr\'sis I.inn., Fab., Jurine. 



AntenncE inserted close to the margin of the clypeus, geniculated, 

 fusiform, 1.3-jointed j first joint the longest. (1.) 

 Lahrum very minute, long, attenuated, ciliated. (2.) 

 Mandibles hairy, externally arcuated, with 3 sharj) teeth towards 

 the apex. (3.) 



MaxillcB horny at the base, membranaceous towards the apex, 

 ovate, entire, ciliated : Palpi a-jointed, longer than the maxilUe, 

 third joint rather thicker, fourth and fifth rather longer than the 

 others. (4.) 



Mentum long, dilated anteriorly : Palpi short, 3-jointed : Lip 

 with the margins conniving externally. (5.) 

 Clypeus with a deep impression between the eyes, receiving the first 

 joint of the antenncc. Thorax semi-cylindric, angular, divided by 

 3 transverse sutures. Metathorax nut elongated into a scutellum. 

 Body contractile into a ball. Abdomen attached only by a portion 

 of its transverse diameter, semicircular, ivith the extremity rounded, 

 convex above, concave beneath, composed of three joints, the second 

 very large. Tarsi 5-jointed. (S.) Superior wings u-i^/i the margi- 

 nal cell scarcely complete at the apex ,• discoidul cells very obscure. 

 Inferior wings without distinct nerves. 



Ardens Lat. Coq. Illus. Icon. Lis. dec. 2. p. 59. t. ]4. f. 7. 



Shining, pubescent. Head and thorax deeply, abdomen minutely 

 punctured. Green, centre of head, thorax and abdomen, crimson 

 reflecting purple and gold. Posterior angles of thorax blue. Un- 

 der side of abdomen black, sometimes aureous towards the base. 

 Wings fuscous, with alternate bands of green and gold at the pos- 

 terior margin. Antenna; black, green at the base. Legs green. 

 Tarsi rufous. 



Li the Cabinets of the British .}hiseiini and the Author. 



In a loiiiu'i" miiuber (folio 8.) was given the Genus C/injsis .- 

 and another group of the same family, .separated by Lalreille, 

 is the subject of the present paper. Although the Ilcdycini 

 ma}' equal the Chrys^idcv in sjilendour, their form is by no means 

 so elegant ; the obiuseiicss and breadth of the abdomen di- 



