164 Mr. H. W. Bates on the Endomychidge of the Amazon Valley. 



strongly marked than those varieties are found in company with the 

 type. I cannot decide to treat them as distinct species, and shall 

 therefore describe them as varieties of C. discoideus, giving to the 

 most distinct a separate name. 



Var. 1. C. robustiis. Thorace mox pone basin sensim ac paululurn ampliato, 

 elytris pone bumeros sensim, apicem versus citius sed semper gradatim 

 angustatis, margine pallido apud latera exiguo, apud bumeros et apicem 

 in maculam amplificato. Reliqius ut in typo. — Long. lin. 4 ( J ). 



Of this form I have two males, one taken at Ega and one at 

 Fonte Boa ; the elytra are much more tapering than in the same sex 

 of the type. It appears a more robust insect, the antenna; seem to 

 be thicker. The pale margin is extremely narrow along the sides, 

 but is dilated at the shoulders, and especially at the apex, into a 

 large spot. 



Var. 2. Thorace angusto, mox pone basin sensim ac paululurn ampliato, 

 angulis anticis acutis. Reliquis ut in typo. — Long. lin. 3 ( $ ). 



I have two examples of this form, taken at Ega. Like C. rohustus, 

 the thorax is not widened from the middle as in the type, but gra- 

 dually and slightly widened from the base, rounded, and narrowed 

 again slightly towards the apex. In every other respect it is the 

 same as the type. 



Var. 3. Antennis tenuibus, articulo 3*io quam 4*0 et 5*<> conjimctis longiore. 

 Reliquis ut in typo. — Long. lin. 3£ ( tf § ). 



One example (male) from Ega, and one (female) from the river 

 Tapajos. 



Var. 4. Rufo-ferrugineus, aurichalceo-micans, antennaruni articulis 4-8 

 fuscis, elytrorum margine proecipue bunierali et apicali pallidiore ; 

 elytris subrugoso-punctatis interstitiis perminute punctatis. — Long. lin. 



I have before me two males and three females, all from Ega. They 

 differ from the var. aurichalceus of Gcrstaecker in the coloration of 

 the antennae. They are not constant, however, in this character, 

 some individuals having the antenna? much darker than others ; one 

 having only the tips of the seventh and eighth joints fuscous. It is 

 curious that the typical examples of the species taken in the same 

 locality should always have the same joints of a clear red colour, 

 whilst the pale ones have them always more or less fuscous. The 

 elytra are more roughly punctured in this variety than in the type. 



