500 Mr. Gilbert J. Arrow on Characters and Relationships 



distincte S-dentatis ; forcipis lobis longitudine subaequalibus, dextro 

 lanceolate, basi paulo iiiHato, sinistro obtuso. 

 Long. 10-11 mm. Lab. max. 6 mm. 



Hah. W. Africa : St. Thome I., Vista Alegre (Z. Fea, 

 Oct. 1900). In the British and Genoa Museums. 



This is another rather bright and shining species close 

 to P. ampins, but less broad, with darker and less finely 

 and uniformly punctured elytra. 



Hyhochaetodus, gen. no v. 



Corpus breviter ovatum, convexum. Oculi baud prominentes, de 

 supra visi vix perspicui. Clypeus semicircularis, fere ut latus quam 

 caput. Labrum breve, porrectum, transversum. Mandibulae 

 porrectae, falciforraae, extns obtuse angulatae, apicibus acutis. 

 Antennae breves, sat crassae. Protborax lateribus arcuatus. Scu- 

 tellum minutum, vix perspicum. Corpus subtus grosse striolatum. 

 Pedes baud longi. Tibiae anticae 3-dentatae, supra serratae. 



Hyhochaetodns obscnrns, sp. n. 



Niger vel piceus, capite pronotoque obscure cupreis, bis grosse sat 

 crebre punctatis, pronoti medio leviter sulcato, ante marginem 

 posticam late et prot'unde triangulariter impresso, lateribus regulariter 

 arcuatis, angulis anticis acutis, posticis obsoletis, singulo elytro 

 carinis angustis circa 13 praebentibus, 4°, 7°, 10° et 13° paulo magis 

 elevatis, integris, reliquis plus minusve interruptis, tibiis anticis 

 acute B-dentatis, supra serratis. 



Long. 8 mm. Lat. max. 4 mm. 



Hah, Peru: Vilcanota. 



Two specimens were contained in the Berlin Entomo- 

 logical Museum, one of which has been presented to the 

 British Museum. 



The genus is a well-marked one allied to Chaetodiis, but 

 more ovate and not setose. The scutellum is much re- 

 duced and covered by the pronotutu when the latter is 

 not drawn forward. The mandibles are large and very 

 acute, and when the tips meet a gap is left between 

 mandibles and labruui. The pronotum is very strongly 

 punctured and has a deep pit just before the base. The 

 elytra are opaque and closely carinate, each third carina 

 being very slightly more regular and pronounced than 

 those interveninof. 



