60 Mr. J. S. Balj on 



elevato-reticulatis, reticulo nitido, areolas parvas irregu- 

 lare opacas includenti ; margine lateral! antice late, 

 postice modice, explanato, fere piano, vitta lata, superfi- 

 ciem fere amplectente, supra disci marginem extensa, 

 rufo-testacea, ornato. Mas. 



Triangularis, elytrorum lateribus basi oblique ampliatis, 

 paullo ante medium obtuse angulatis. Line ad apicem 

 rotundato-angustatis, apice subacute rotundatis. Fcem. 



Var. a. Elytrorum margine laterali disco concolori, 

 sanguineo vel testaceo-reticulato. 



Var. h. Elytris totis unicoloribus. 



Long. 7-8 lin. 



Hab. — Ecuador. 



D. instahiUs is very variable both in colour and shape ; 

 some males being less rotundate, and some specimens of 

 the other sex more triangular than the rest; it may be 

 separated from D. Salvinii, metallica and all the other 

 species to which it is most closely allied, by having the 

 whole of its upper surface sparingly clothed with short 

 pubescence. 



Dolichotoma sericea. 



Rotundata, modice convexa, nigro-a;nea, subopaca, 

 antennis, basi exceptis, nigris, subtus magis nitida ; 

 femoribus antice antennarumque basi pallide testaceis ; 

 thorace longitudine plus duplo latiori, apice utrinque 

 sinuate, medio leviter producto, lateribus ante medium 

 late rotundato-ampliatis, pone medium fere rectis, paral- 

 lelis ; disco medio convexo, pube adpressa argenteo-cinerea 

 dense vestito, margine laterali lineaque longitudinali 

 centrali, postice tenuiter canaliculata, glabris ; elytris 

 pube adpressa cinerea brevissima vestitis, thorace latior- 

 ibus, lateribus a basi ad medium late rotundato-ampliatis, 

 ultra medium ad apicem rotundato-angustatis, apice con- 

 junctim late rotundatis ; supra modice convexis, basi 

 leviter impressis, ante medium obsolete gibbosis, fortiter 

 punctatis, punctis prope suturam subseriatim dispositis ; 

 margine laterali late explanato, remote punctato. 



Long. 7^ lin. 



Hab. — Ecuador. 



Dolichotoma sericea is similar in form to T). speciosa, the 

 latter species may, however, be at once known by the 



