488 PHYTOPHAGA. 



Eab. Mexico, Puebla (SalU). 



T. modesta may be separated from uniformly coloured varieties of T. luteo-cincta, Lee, 

 by the very finely rugosely punctured elytra and the short pubescence, which gives the 

 former an opaque and dull appearance ; the thorax is more shining, very sparingly 

 pubescent, but much more strongly punctured and rugose. 



8. Trirrhabda foveicollis. (Tab. XXVII. fig. 23.) 



Reddish-fulvous, the antennae and tibise lighter; head rugose-punctate; thorax with two deep transverse 

 foveas, impunctate ; elytra finely rugose and pubescent, dart fuscous, the lateral margin and a discoidal 

 stripe from the base to the apex testaceous. 



Length 4 lines. 



Head finely rugosely punctured at the vertex ; antennae long and slender, testaceous, the basal joints slightly 

 darker, the third joint rather more than double the length of the second, the fourth twice as long as 

 the preceding joint ; thorax three times as broad as long, short, the sides rather evenly rounded, the 

 angles not prominent but thickened, the surface shining, rufous, impunctate, with a very deep transverse 

 fovea at each side almost extending to the middle and occupying nearly the entire disc ; elytra dilated 

 posteriorly, finely rugose throughout, clothed with short pubescence, the narrow discoidal pale fulvous 

 stripe commences at the middle of the base, and, after gradually approaching the suture, joins the 

 similarly coloured margins at the apex ; underside dark fulvous or rufous ; legs testaceous. 



Hob. Mexico, Playa Vicente (Salle). 



T. foveicollis, of which only a single (apparently female) specimen is before me, is not 

 unlike T. brevicollis, Lee, in the pattern of the elytra, but is at once distinguished from 

 that and the other species of the genus by the very deep depressions of the thorax in 

 connection with the rugosely punctured head. 



GALEKUCELLA. 



Galerucella, Crotch, Proc. Acad. Phil. 1873, p. 55 ; Weise, Insect. Deutschl. vi. p. 616 (1886). 

 Galeruca, Leconte & Horn, Class. Col. N. Am. p. 348 (1883). 



The open anterior coxal cavities, closely pubescent elytra, unarmed tibiae, and bifid 

 claws are the principal structural characters peculiar to Galerucella. The genus contains 

 at present, amongst its exotic members, a number of species which certainly belong to 

 several different genera, on account of the closed coxal cavities and other differences. 

 For several species described here it would perhaps have been as well to establish new 

 genera, had I been able to point out characters of sufficient importance by which they 

 might have been recognized. For most of the European species, Galerucella is suffi- 

 ciently well characterized, but many of the exotic forms partially or totally lose the 

 typical characters; new genera for the reception of these are, in my opinion, no 

 advantage, since the differences seem to be of degree only. Chapuis seems to have 

 overlooked characters of the present genus, and calls the anterior coxal cavities closed, 

 mixing up the genus Galeruca (Adimonia), in which the cavities are closed, with 

 Galerucella, in which they are open. This will necessitate a revision of the many 

 described species sooner or later by a future monographer of the genus. 



