ARESCUS. 83 



opaque subrugose excavation, extending to the base of the frontal 

 horn. Tliorax transverse-quadrate ; sides sinuate behind, slightly 

 rounded and narrowed towards the apex, armed just befo-e their 

 middle with a small, nearly obsolete tooth, posterior angles pro- 

 duced, acute, anterior subacute ; siu'face smooth and shining, 

 slightly convex, disc with several irregidar depressions, sides 

 coarsely but not closely punctured. Scutellum smooth and shining. 

 Elytra oblong ; sides parallel, narrowly margined ; the apex 

 rounded, emarginate at the suture, sutural angle armed with a 

 small acute tooth; above convex, finely punctatc-striate, sides 

 irregularly and more closely punctured ; behind the middle is a 

 curved oblique elevated ridge, which becomes gradually lost to- 

 wards the apex of each elytron. 



Female. Frontal horn (Tab. III. fig. 39) narrowed from its base 

 to the apex, the latter obtiisely truncate, frontal excavation rather 

 more rugose than in the male. Thorax rather narrower, and 

 without the lateral tooth. Elytra rounded at their apex, slightly 

 sinuate at the sutm-e, the angle armed with an indistinct tooth ; 

 elevated ridge behind the middle obsolete. 



A. Body fulvous. 



B. Body fulvous ; scutellum and one or more spots on each 

 elytron black. 



C. Body yellow or mfo-fulvous ; abdomen and elytra (their 

 base excepted) black. 



D. Body fulvous ; two irregular vittaj on the thorax, and the 

 elytra, black ; apical third of the latter fulvous ; the middle of 

 the fidvous portion with a large round black spot. 



E. Body rufo-fulvous ; elytra with a large common black patch. 

 E. Body black ; front and one or more faseiaj on the elytra ful- 

 vous or rufous. 



Hah. Ega, Upper Amazons ; sent by Mr. Bates. Peru, M. de Gand. 

 British Museum, and collections of W. W. Saunders, Esq., E. 

 Sheppard, Esq., and J. S. Baly. 



This species is truly protean, and I have indicated above only 

 a few of its most striking varieties ; almost eveiy indi\ddual varies 

 more or less, so that it becomes impossil)le to say what is the typical 

 colour of the species. The Arescus Buquefii, Gucr., Te.vfe du Regne 

 Animal, is possibly a variety of this insect. 



4. Arescus lahiatus, Forty. B.M. 



Arescus lahiatus, Perty, Bel Anim. Artie, p. 101. pi. 20. fig. 7. 



A. oblongo-elongatus ; clytris simplicibus in utroque sexu ; fla^Tis 

 aut fulvus, nitidus ; antcnnarum apice. puncto frontali. thoracis 

 margine, vitta punctisque duobus, elytrorumque margine, fasciis 

 duabus maculaiformibus, maculaque subapicaU, nigris. 



g2 



