750 MU. M. JACOBY ON THE [Kov. 3, 



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

 another genus lias already been mentioned somewhere by Herr von 

 Harold. 



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



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



Length 2-3 lines. 



Head impunctate, deeply grooved between the antennse ; tlie 

 frontal tubercles strongly developed ; carina short and broad ; the 

 penultimate joint of the maxillary palpi incrassate. Antennse nearly 

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

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

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

 Thorax transversely subquadrate, the sides straight and narrowed at 

 the base, sliglitly 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 api)endage 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 antennse in the male show a curious curvature, 

 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 peculi- 

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

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

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

 insect has the typical incrassate 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 

 Coleopt.,' 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 difi'erence 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. nujer, Motsch., they are described as equal and very 

 short). Anyhow Arthrotus would find its place in Chapuis's twenty- 

 second group. 



