40 Mr. Martin Jacoby's new species of 



Diacantha chevrolati, Guer., is described by the author as having 

 flavous elytra, each with four greenish black spots ; Allard 

 describes the species as black, with two large fulvous spots. A. 

 petersi, Bertol., A. divisa, Gerst., and A. hispinosa, Fabr., are 

 placed by Allard in Idacantha, — the true place of these species 

 being Aidacophora, on account of the bifid claws : this is correctly 

 given in Duvivier's ' Catalogue of Phytophaga,' while the type 

 of the genus Idacantha — D. hidentata, Fabr. — is placed by Allard 

 in Aidacophora : other species described by Karsch are entirely 

 ignored or likewise misplaced. The same remarks apply, unfor- 

 tunately, to the table of the species of Aulacophora by Allard, 

 which has already been remarked by the late Mr. Baly in the 

 * Transactions ' of the Entomological Society of London. It is 

 therefore impossible to decide whether the species described by 

 Allard really belong to Idacantha or to Aidacophora. 



Chapuis has likewise mistaken the genus Idacantha, and 

 overlooked the aj^pendiculate claws and the narrow elytral epi- 

 pleurse. The following species seem to me to be undescribed, 

 and are contained in my collection : — 



Idacantha madagascariensis, n. sp. 



Pale fulvous or testaceous ; elytra metallic greenish-blue, finely and 

 sparingly punctured ; a transverse band at the middle not extending to either 

 margin, and a large round spot near the apex, pale testaceous. 3' • Elytra 

 with a conical tubercle near the apex, the sides with a costa. ? . Elytra simple 

 the apical spot absent. Length, 3^ — 4 lines. 



$ . Head fulvous, entirely impunctate, the frontal elevations narrow, the 

 carina acute and narrow, palpi strongly thickened ; antennae dark fulvous, 

 scarcely extending to half the length of the elytra ; thorax transverse, dark 

 fulvous, the sides widened anteriorly, the surface with a few punctures near 

 the anterior angles, the disc with a deep impression at each side ; scutellum 

 fulvous ; elytra with a rather broad, medially widened margin, depressed 

 below the base, of a bright metallic greenish-blue colour, the middle occu- 

 pied by a broad pale testaceous transverse band, which does not extend to 

 either margin, and a large round similarly coloured patch near the apex, 

 extending to the sutural but not to the lateral or apical margin, each elytron 

 with a large conical tubercle near the apex, close to the suture, and a longi- 

 tudinal costa near the sides below the shoulder and abbreviated below the 

 middle ; underside and legs pale fulvous ; claws appendiculate. 



Hah. Madagascar (Matanga). 



Of this well-marked species I possess a male and female 

 specimen : the latter is more closely punctured, and devoid of 

 the elytral tubercle, costa, and the apical spot, but this latter 

 may possibly be present in other specimens. From I. ephippiata, 

 Dalm., the present species differs in the nearly impunctate 

 thorax, flavous tibiae, and other particulars. 



Idacantha abdominallis, n. sp. 

 Black ; the head, basal joint of the antennae, the thorax, the femora, and 

 the last abdominal segment, flavous ; elytra fulvous, all the margins and a 

 narrow transverse band at the middle black. Length 3 — 3i lines. 



