276 Mr. G. J; Arrow on LamelUcorn Beetles. 



punctured and the elytra less smooth and shining. Tlie 

 elvtral spots are entirely black, the two basal ones elongate, 

 and the black sutural line is not produced round the outer 

 margin as in C. liomorpha, but there is instead a narrow 

 black line within the outer edge. In the female the elytral 

 margin is not angulated near the middle, as in the allied 

 species, but towards the extremity. 



It is highly interesting to find two species living so far 

 apart as the Amazons and_ Mexico with important structural 

 diiFerences, but almost identical pattern and general appear- 

 ance. They are evidently mimetic forms, strongly suggesting 

 various conspicuously marked species of Oarabidce, Erotylidse, 

 and Ohrysomelidae. Probably the resemblance is general 

 rather than particular, for the closest similarity I have 

 noticed to any individual species of another family is to 

 Morphoides 10-notaius, Duponch., an Erotylid inhabiting 

 South Brazil, a third region very distinct faunistically. 



Agaocephala {)iermicoUis, sp. n. 



Cuprea, elytris testaceis, marginibus callisque humeralibus et 

 apicalibus iiifuscatis ; sat convexa, nitida, clypeo rugoso. fronte 

 fere laevi ; pronoto igneo-cupreo, insequaliter punctato, punctis 

 disci parcis, et minutis, lateribus subtiliter rugosis, m irginibus 

 valde arcuatis, angulis omnibus obtusis, posticis fere obsoletis ; 

 scutello parce punctato ; elytris ab humeris apicem versus paulo 

 ampliatis, fortiter, irregiilariter sat crebre punctatis, caUis 

 humeralibus et apicalibus promineutibus, laevibus : 



cj , capite bicornuto, cornubus antrorsum fere recta productis, apice 

 acumiuatis, leviter recurvatis; pronoto valde convexo, toto in- 

 errai ; pygidio valde incurvato, subtiliter punctato, lateraliter 

 minute rugoso ; antenuarum clava magna. 



Long, (absque cornubus) 30-31 mm. ; lat. max. 16'5-17*5 mm. 



Hab. S. Brazil : Rio Grande. 



Two males were contained in the collection of the late 

 Alexander Fry, now forming part of the British Museum 

 collection. 



The species is allied to A. duponti. Cast., but differs from 

 that and all other species in its smooth and shining surface, 

 that o£ the pronotum especially. Like that species and 

 A. meIoIo7ithoides, Thorns.^ the male has no trace of a thoracic 

 ju'ocess, and another interesting feature is the elongate club 

 of the antenna in this sex. This is common to the three 

 species witii unarmed thorax, whilst all those in which a 

 thoracic process is found have the club small and scarcely 

 different from that of the female. 



