PKOMECOSOMA.— COLASPIS. 135 



The underside, head, and thorax, as well as the extreme lateral margin and apex of 

 the elytra, in this species are fulvous ; in other respects it does not seem to differ to any 

 extent? from P. fervidum and P. cinctipenne. 



16. Promecosoma lngens. (Tab. vill. fig. 12.) 



Promecosoma lugens, Lefevre, Ann. Soc. Ent. France, 1877, p. 135. 

 Bab. Mexico, Oaxaca (Boucard, coll. Salle). 



Distinguished by the comparatively long antennae, the black underside, legs, head, 

 and thorax. Only a single specimen is before me. 



17. Promecosoma viride. (Tab. vill. fig. 14.) 



Elongate, convex, metallic green ; antennae and legs fulvous, last three joints of the former piceous ; thorax 

 closely punctured ; elytra punctate-rugose, the interstices at the apex costate. 



§ . Elytra with a strongly raised longitudinal costa from the shoulder to the apex. 



Length 2 lines. 



Head closely punctured, with a more or less distinct longitudinal groove ; the spaces above the insertion of the 

 antennas smooth and shining ; thorax transverse, strongly and closely punctured, the sides rounded and 

 entire ; elytra punctured like the thorax, the interspaces transversely rugose, and raised near the extreme 

 apex into two or three short costse ; legs fulvous, the intermediate tibiae entire. 



Hah. Mexico, Cuemavaca, Oaxaca {Boucard, coll. Salle), Guanajuato (Buges, coll. 

 Salle), Oaxaca {Hbge). 



I find the name given to this species by M. Lefevre under half a dozen specimens in 

 M. Salle's collection ; but I am not able to find any description or note referring to it, 

 and conclude that it is a MS. name, which I have retained ; I am also inclined to 

 believe that the present species is out of place here, as the principal characters, the 

 emarginate middle tibiee and sinuate lateral margin of the thorax, are absent. The 

 general appearance and sculpture of the species, however, are so much like those of the 

 others belonging to the genus that I thought it best to leave it amongst the latter. 

 The insect before us is the smallest of the genus, and was obtained in great numbers 

 by Herr Hoge. 



COLASPIS. 



Colaspis, Fabr. Syst. El. i. 1801, p. 411 ; Chapuis, Gen. des Coleopt. 1874, x. p. 248. 



With more than sixty described and a great many undescribed species, this genus 

 may be considered the type of the group (the Colaspinse of Chapuis). Although no 

 doubt closely allied to Metaxyonycha, Prionodera, and several other genera, the present 

 one has a certain facies in most cases to distinguish it ; numerous exceptions are, 

 however, to be found, and it is scarcely possible to point out the characters peculiar 

 to Colaspis only. From Prionodera, for example, I know of no definite structural 

 character to divide the present genus, unless the convex upper surface and anteriorly 

 narrower thorax are taken as a guide : these two characters hold good generally ; and 



