34 Mr. E. W. Janson's descriptions of 



2. Semiotus formosus, n. sp. PI. I, fig. 1. 



S. fere ellipticus, niger, glaber, nitidus; prothorace transverse, 

 quadriplagiato; elytris margiuibus lateralilms maculisque duabiis 

 aurantiacis. Loug. 2G-30 mm., lat. 8-9 mm. 



Nearly elliptical, black, slilning ; protliorax witli four large 

 orange-yellow spots, one at each anterior angle, and one on each 

 side contiguous to the margin, behind the middle ; elytra with 

 the lateral margin and a transverse subbasal spot connected with 

 it of the same colour. Head unarmed, rounded in front, with a 

 few deep irregularly disposed oblong punctures, and a large deep 

 triangular anterior impression ; antennae exceeding the thorax in 

 length, black. Prothorax transverse, convex in the middle, with 

 remote oblong punctures varying in size ; emarginate in front, 

 rounded at the sides, lateral maririns swollen and reflexed, esneci- 

 ally before the middle ; anterior angles prominent their apices 

 rounded ; posterior angles slightly divergent, acute, deflexed ; 

 a short centi-al polished posterior ridge before the scutellum. 

 Scutellum transverse, pentagonal, impunctate. Elytra conspicu- 

 ously wider at the shoulders than the thorax, nearly thrice its 

 length, gradually narrowed to the summit, extreme apex truncate, 

 sutural angle unarmed ; finely puuctate-striate, interstices flat, 

 transversely wrinkled. Beneath lilack, shining, the four pro- 

 thoracic spots and refiexed margin of the elytra orange-yellow. 



Chiguiuda. Two specimens. 



According to the most lecent, but very artificial and luisatis- 

 factory, arrangement of the genus (Candczc, IJevisiou de la 

 Monographic des Elatcridcs, fasc. 1, p. 17(.), 1874), this beautiful 

 and coiispiiuiDUs .spocies must bo referred to his seventh section 

 " AA Chaperon inei-me ; aa elytres bit'-pineuses ou tronquees 

 au bout," and jilaccd at the head of the section, immediately 

 preceeding the Chilian S. hiteipcnnis, but wilh which it appears 

 to me to hnve but little affinity. 



3. Semiotus cams, n. sp. PI. I, fig. 2. 



S. elongatus, nitidus ; capite nigro, antice bispinoso, antennis 

 apice flavis; prothorace sanguineo, immaculato; elytris luteis, 

 striato-punctatis, vitta suturali marginibusque lateralibus nigris. 

 Long. 14-18 mm., lat. 31-4| mm. 



Elongate, shining, he;ul black, thorax blood-rod, elytra ochre- 

 ous-ycllow, with a sutural vitta and the lateral margins black. 



