Mr. J. S. Baly on the Phytophaga. 455 



costatis. Antqu'ctus angustmn, integrum. Pedes : femon'bus qunUtor 

 anticis leniter, posticis sat inonissatia, subtus non canalioulatis ; tihiis 

 MARIS quatuor atitertoribiis extiis ante apicem spina valida annatis, ilia 

 tibiarum anticariwi brevi ; tibiis posticis muticis, apice paullo incrassato, 

 extus excavate, introrsum curvato, in processum obtusum comprcssuni 

 prodiicto : fcemin^ tibiis anticis muticis, intei-mediis spina brevi anuatis, 

 posticis apice introrsum non curvato, non producto, spina acuta armato, 

 tarsonim ejusdem paris articulo basali ad apicem tibife inserto. Tarsis 

 articulo tertio brevi ; posticis paullo ante apicem tibife insertis ; ungui- 

 culis bifidis, dente interiore paullo breviore,compresso, introrsum curvato. 

 T^-pe, Plectrotetra Clarkii, Baly. 



Plectrotetm Clarlii. (Plate XXI. fig. 3.) 



P. elongata, subcylindrica, rufo-testacea, nitida; antennis (basi excepta), 

 femorum basi, tibiis tarsisque nigro-fuscis ; elytris viridi-cyaneis, gemel- 

 lato-punctato-striatis. — Long. 3-31 lin, 



Mas. Elytronun interspatiis alternis minus costatis, ante medium fere 

 planis, tarsorum anticorum quatuor articido basali dilatato. 



Fcemina. Elytrorum interspatiis alternis valde costatis. 



Var. A. Antennis corpore concoloribus. 

 Hab. Oaxaca, Collected by M. Sall^. 



Elongate, subcylindrical, parallel, shining rufo-testaceous ; antennae 

 (theii- basal joints excepted), extreme base of thigbs, the tibiae and tarsi 

 nigro-fuscous ; unguiculi riifo-piceous. Head prominent ; face nearly 

 perpendicular, trigonate ; epistome separated from the face by an ele- 

 vated line, from the apex of which a broad, strongly raised ridge extends 

 upv^^ards as far as the upper edge of the insertion of the autennte, where 

 it becomes dilated on the upper portion of the face into a raised, bilobed, 

 obovate space ; antennae longer than the body in the male, shorter in 

 the female. Thorax transverse, sides moderately rounded, slightly 

 narrowed in front, all the angles slightly produced, acute ; upper sm-face 

 swollen, slightly flattened across the middle of the disk, the latter im- 

 pressed near its base with a sinuous transverse groove, either end of 

 which, before reaching the lateral border, curves obliquely to the 

 hinder margins; surface of disk nearly impimctate. Elytra rather 

 broader than the thorax, narrowly oblong, sides parallel, the apex 

 obtusely rounded, sutural angle acute ; surface of each impressed with 

 five or six double rows of punctures, the punctures being placed moi'e 

 or less irregularly on the striae ; interspaces between each double set of 

 strias nearly flattened in front in the male, more or less costate towards 

 the apex, in the female costate for their whole length ; interstices 

 between the punctures on the striae frequently transversely costulate. 



Genus Nonarthra. (Details, Plate XXI. fig, 1.) 



Corpus rotundato-ovatum, convexum. Caput exsertum ; antennis 9-arti- 

 culatis, robustis, ad apicem subincrassatis, compressis, articulo primo 



