526 Mr. G. Lewis' suiyplementary note on the 



of 500 miles. The two insects are locally separated 

 from each other by the Biwa Lake barrier, north of 

 which the climate of Japan is much colder, owing to the 

 higher mountain ranges which run up the centre of the 

 main island, and, partly because there, the effect of the 

 Kurosuwo, or gulf-stream, on the general temperature is 

 lessening as the stream begins to pass away eastward 

 into the Atlantic. 



Carahus Alhrechti is another abundant species, a scion 

 branching out of one of the above, and is a more pre- 

 valent form than either of them, for the climate permits 

 it to retain its specific characters, subject to very slight 

 variation in all the islands, and it is spread over a space 

 equal to 1300 miles. Yet still, even in this species, the 

 southern specimens can be distinguished from those of 

 Holikaido by a slightly more graceful outline, somewhat 

 more slender legs, and a rather less coppery colour. 

 From the southern type of Alhrechti emanates Mai- 

 yasanus, which is limited to a comparatively small area, 

 and then occurs only at considerable elevations. The 

 head-quarters of it are in the Idzu Province, but I have 

 specimens of it from Oyayama, near Kumamoto, in 

 Kiushiu ; the distinguishing character of it is the con- 

 stant pale tibise, while all other known Carahi in Japan 

 have dark-coloured legs. 



Carahus Yakoninus is an offshoot from Dehaani, and 

 we find it existing only in that part of Japan where the 

 parent type is abundant ; both reside side by side, and 

 if intermediate varieties could be procured the short 

 distances between them would be bridged over. But I 

 failed to find any form of it in the north with insolicola, 

 nor could I obtain any varieties in the south. The most 

 notable feature of this transitional species is that it is 

 w^ell marked in colour as being nocturnal, and therefore, 

 like Dehaani, suited to the mild climate of Kiushiu, where 

 it is found. 



In another section of the genus, Carahus Maacki, 

 similar variations appear. A series from Tonasawa, lat. 

 35°, is black ; these represent Carahus telluris, n. s. ; 

 while specimens of Moriwitz's type from Sapporo, lat. 

 43°, are distinctly green and metallic. 



In a third section, represented by Carahus jwocerulus, 

 which occurs from Kumamoto to Awomori, I found near 

 Sapporo an allied species, arhoreus, n. s., which is more 

 robust and less elegant; the climate in this species 



