600 Miscellaneous. 



than in //. unicolor, and the abrupt posterior termination of 

 the tliird piimary osta forms an additional callus which is 

 present also in //. griseoser leans. 



Hexodon unicostatiim, sp. n. (See fig. G.) 



Piceum, capita pronotoque nigrescentibus, pedibus sat laete rufis, 

 corpore supra opaco, griseo-vestito ; prothoracis et elytrorum 

 marginibus extremis, singuli elytri vittaque arcuata paulo 

 elevata postice abbrcviata nitidis ; ovatum, postice latissimum, 

 clypeo antrorsum paulo contracto, sutura nulla ; prothorace baud 

 latissiino, basi leviter trisiiiuato, augulis posticis baud acutis aut 

 valde i^roductis ; scutelli medio dense piuictulato ; elytris cou- 

 junctim latioribus quam longioribus, lateribus autem baud lato 

 deplanatis, postice truncatis, augulis suturalibus minute rotun- 

 datis : prosterno postice baud erecto : 

 d" , tarsis 4 anterioribus quam tibiis longioribus, posticis paulo 



brevioribus, pygidio convexo, baud porrecto ; 

 5 , tarsis posticis quam tibiis multo brevioribus, pygidio porrecto. 



Long. 17-10 mm. ; lat. max. 11 •5-12-5 mm. 



Ilah. N.E. Madagascar ; Antongil Bay. 



The type specimen (received from Herr Felsche) is in the 

 British Museum, and I have al.-o examined a series in the 

 Paris i\Iuseum containing both sexes, a pair of which has 

 been kindly presented. 



The species is a rather small one of distinctive shape, the 

 prothorax being relatively narrower than is usual, and the 

 elytra short and bread, but without strongly devclopeil 

 lateral flanges. The posterior angles of the prothorax are 

 rounded and only slightly produced backwards, so that thoy 

 are in a line with the slightly prominent median lobe. The 

 mesonotum is closely punctured and opaque and the scu- 

 tellum forms a well-marked lobe. There is a single smooth 

 and shining median carina upon each elytron, extending 

 from the middle of the basal margin to the apical callus 

 when fully developed, but sometimes widely interrupted. 

 The prosternum does not form a free process behind the 

 coxa?, and the legs are rather less elongate in the male than in 

 the other species of the genus. 



MISCELLANEOUS. 



"VVe omitted to mention in our April number that our thanks are 

 due to the Trustees of the British Museum (Natural History) for 

 kindly lending us the process-block illustrating Mr. Arrow's paper 

 on Pliytahis smitJii (p. 456). 



