750 MR. M. JACOBY ON THE [KoV. 3, 



lection has proved to me. That A. armata ought to be placed in 

 another genus has already been mentioned somewhere by Herr von 

 Harold. 



Aenidea tibialis, sp. nov. (Plate XLVI. fig. 8.) 



Fulvous ; antennae fuscous ; elytra black, shining, impunctate. 



Length 2-3 lines. 



Head impunctate, deeply grooved between the antennae ; the 

 frontal tubercles strongly developed ; carina short and broad ; the 

 penultimate joint of the maxillary jialpi iucrassate. Antennae nearly 

 as long as the body, slender, the second joint very short, the others 

 rather strongly curved in the male but straight in tiie female, fuscous 

 or obscure fulvous, their edges covered with rather long jmbescence. 

 Thorax transversely subquadrate, the sides straight and narrowed at 

 the base, slightly rounded in front ; surface with a transverse fovea 

 at each side, impunctate, fulvous. Scutellum piceous or fulvous. 

 Elytra wider at the base than the thorax, parallel, shining, impunctate. 

 Underside and legs fulvous or flavous, the posterior tibiae of the male 

 furnished with a short appendage at the apex ; the metatarsus as 

 long as the three following joints together. Anterior coxal cavities 

 closed. 



Nara, Kobe, Maiyasan, Nikko. 



The joints of the antennae in the male show a curious curvatui'e, 

 and the extreme base of the lower ones is colourless so as to appear 

 almost unconnected with each preceding joint. The thorn-like 

 appendage at the posterior tibiae in the same sex is another ))eculi- 

 arity of this species, which in coloration partly resembles A. abdomi- 

 nalis, Baly. When viewed under a very strong lens, the elytra are 

 seen to be finely granulate with some more distinct punctures. This 

 insect has the typical iucrassate terminal joint of the palpi. 



Genus Arthrotus, Motsch. 



The structural characters of this genus have never to my know- 

 ledge been properly pointed out. Chapuis, in his • Genera des 

 Colc^opt.,' placed the genus amongst those whose place was doubtful, 

 and gave no particulars respecting it. An examination of the two 

 species described by Mr. Baly from Japan proves Arthrotus to be 

 nearly allied to Antipha, Baly. (If it was identical with the last- 

 named genus the author of the latter would not have placed the 

 Japanese species in Motschulsky's genus.) The only diflereuce I 

 can find, however, between the two genera seems to be the more 

 narrowly transverse thorax oi Arthrotus, the anterior angles of which 

 are acute and produced slightly outwards. The anterior coxal 

 cavities are closed, the tibiae unarmed, the first joint of the posterior 

 tarsi is nearly as long as the three following together, the claws are 

 appendiculate, and the second and third joints of the antennae subequal 

 (in the type, A. niger, Motsch., they are described as equal and very 

 short). Anyhow .4r^^ro^M« would find its jjlacein Chapuis's twenty- 

 second group. 



