36 NOTES ON MILLIPEDES. 



The usual numbers seem to be I64-I6, or 16+17. 



Sexes. " In Pcdamna'us silenus and Hormurus the male has 

 the two halves of the genital operculum separated so that this 

 can be pulled apart, while in the female, though the suture 

 remains, the two are inseparable. The combs are also larger in 

 the male." Pocock. 



District. Siam, and Cochin China. 

 8. Hormurus australasioe (Fabr.) 



Siamese ,k Mengpon-ton" = Tree Scorpion. 



This is a small dark brown scorpion with large pincers, a 

 comparatively short, slender tail and a very small sting, com- 

 monly to be found under the bark of trees, but I have also 

 obtained it among a pile of logs, and under dead leaves on the 

 ground. Pocock says " this species is found in S. East Asia and 

 all over the Islands of the Indo-Malayan, Austro-Malayan and 

 Australian Region," and mentions it being recorded from the 

 Himalayas, Corea, Sumatra, Java, Flores, Saleyer, New Britain, 

 Solomon, Loyalty and Fiji Islands. 



Personally I have caught seven specimens on Penang Hill, 

 at elevations of 1800 to 2300 feet; three in Bangkok ; one at 

 Chantaboon ; and two on the island of Kosichang. I also re- 

 ceived one from near Raheng, Siam. 



A Hormurus, probably of this species, is found on Maxwell's 

 Hill, Perak ; I found the remains of one inside a frog (Rana 

 macrodon) caught at 3,300 feet elevation in April 1808. 



The largest specimen I have measured was from the front 

 of the mandibles to the tip of the sting, -13 mm. 



The pectinal teeth in four Siamese specimens examined 

 were:— (5 + 7, G+7, 7+7 and 7+7. 



Order Pseudoscoqriones. 



The False Scorpions. 



These are the minute and harmless animals sometimes called 

 " Book Scorpions." At Chantaboon I found a species of the 

 genus Chelifer ; and also in Bangkok under the bark of trees, 

 under flag-stones and in packing cases. 



