246 SUMATRAN COLEOPTERA. 



it alive (and in good condition) during two days and nights , 

 but that he did not observe the slightest luminosity in it. 

 The third is a specimen of a very interesting Longi- 

 corn , viz. Bradycnemis velutina C. 0. Waterh. , a species 

 of which the native country was not yet known with cer- 

 tainty. 



J*. S. In a recent paper on new Coleopterous insects 

 from Mount Kinibalu , North Borneo (Proc. Zool. Soc. 

 London. 1889. p. 383) Mr. H. W. Bates describes several 

 new species of Cetoniids which partly belong to new , 

 partly to already known genera. Among the latter are species 

 of the genus Plectrone which is regarded by Mr. Bates as 

 a mere section of the genus Chalcothea. Moreover Mr. Bates 

 supposes my genus Pseudochalcothea to be synonymous with 

 Plectrone. This latter supposition may be correct, the first 

 is certainly erroneous. 



Though the materials belonging to these genera are not 

 very extensive in our Museum, I believe to have found a 

 good characteristic that, besides the margined pronotum 

 and, in the cT, the armed hind tibiae, will serve to dis- 

 tinguish the genus Plectrone (and Pseudochalcothea) from 

 Chalcothea. In the 9 °f Plectrone (and Pseudochalcothea) I 

 find the end of the upper side of the hind tibiae bicuspi- 

 date , whereas in the 9 Chalcothea it ends in a single spine. 

 The distinctive characteristics thus contrast as follows: 

 I. Sides of pronotum not margined. Hind tibiae in the 

 cT simple, their upper margin in the Q ending in a 



single spine Chalcothea. 



II. Sides of pronotum margined. Hind tibiae in the cf 

 provided on the inner side with a compressed spur or 

 appendage , their upper margin in the 9 bicuspidate 

 at the end Plectrone , Pseudochalcothea. 



Notes from the Leyden Museum, "Vol. XI. 



