454 Mr. J. S. Baly on the Phytophaga. 



apice in processum brevem producto ; tarsis posticis articulo priino 

 duobus sequentibus longiore, etsi tibiae dimidio paullo longiore. 

 Type Xcnidea alternata, Baly. 



This genus must be placed close to Plectroscells. 



Xenidea altemata. (Plate XXI. fig. 4.) 

 A', oblongo-ovata, valde convexa, nitida, subtus purpureo-nigra ; pedibus 

 obscure rufo-piceis, purpureo-niicantibus, femoribus posticis diniidio 

 postico obscure purpureis ; antennis pallide fulvis, articulis G t0 , 7 mo , 

 gvo Hmoqne nigria ; supra laete purpurea 5 tborace subremote punctato ; 

 elytris sat profunde punctato-striatis. — Long. If lin. 

 Hub. Aru, New Guinea. 



Oblong-ovate, very convex, nitidous ; body beneath deep-purplish 

 black ; the legs obscure rufo-piceous, the apical half of the hinder 

 thighs obscure purple. Body above deep shining purple. Head smooth, 

 impunctate; epistome elevated into a transverse ridge ; from its centre 

 n strongly raised longitudinal carina runs upwards nearly as far as 

 the upper border of the eyes ; on either side is a deeply grooved line, 

 which, commencing close to the longitudinal ridge, a short way below 

 its centre, and just above the insertion of the antenna?, runs for a short 

 distance perpendicularly upwards, then turns abruptly outwards and is 

 carried directly across the face until it reaches the inner margin of the 

 eye ; here it again forms nearly a right angle with its transverse por- 

 tion, and is continued upwards along the inner border of the eye nearly 

 to the apex of the latter, where it suddenly terminates ; immediately 

 above its apex is a deep roimd puncture; on either side the upper 

 portion of the central ridge is a smooth, impunctate, concave space, 

 boimded below and on the outer side by the above-mentioned grooved 

 line ; antenna? nearly equal in length to the body, pale fulvous, their 

 6 th , 7 th , 8* h , and 11th joints black. Thorax twice as broad as long; 

 sides narrowly margined, obliquely narrowed from the base towards the 

 apex, anterior portion obliquely truncate, the margin of this latter part 

 thickened ; disk indistinctly pimctured, the puncturing more distinct at 

 the base. Elytra distinctly punctate-striate ; interspaces smooth, 

 nearly plane. 



Genus Plectkotetra. (Details, Plate XXI. fig. 3.) 



Corpus elongatum, convexum. Caput exsertum ; antennis mabis corpore 

 longioribus, robustis, apicem versus attenuatis, et ibi gracilibus, articulis 

 lmo cra8S o ? ciuvato,2 , iobrevi, obovato,3ti° ad 7™ m singulis basi ad apicem 

 incrassatis, paullo compressis, perparum latitudine et longitudine decres- 

 centibus,caeteris fiUformibus, ultimo acuto; fcemin^e gracilibus, hliformi- 

 bus, articulis 3 tio ad 7 mum non incrassatis ; mandibulis dentatis ; labio 

 subquadrato ; palpis articulo ultimo subconico ;■ oculis ovatis. Thorax 

 transversus, basi transversim sidcatus. Elytra anguste oblonga, pa- 

 rallela, disco punctato-striata, striis gemellatis, interspatiis fceminje 



