373 



The 2 nd segment wider laterally than the 3 rd and projecting below 

 it; lateral edge of the keel tri-lobed, a single lobe on its posterior 

 border, upper side of keel not tubercular, the rest of the seg- 

 ments strongly tubercular, with 4 longitudinal ridges of 3 tubercles 

 each. The following segments generally resembling the 2 nd , the keels 

 with a large posterior lobe and a bilobed lateral border; those that 

 bear pores have the anterior marginal lobe itself subdivided and the 

 posterior one which supports the pore, much less prominent than the other. 



Length about 6 mm., width less than 1. 



Cryptodesmus , (Peters), Karsch. 



Synopsis of the species. 



a. The head not covered by a laminate' expansion of the 1 st tergite; 

 keels distally narrowed, pointed, with the posterior border cut 

 out into dentiform lobes ; the 5 th and 6 th segments of the antennae 

 not externally expanded into a protuberance ; legs longer and thinner 



bicolor sp. n. 



b. The head covered by an expansion of the 1 st tergite : keels scarcely 

 narrowed distally; the 5 th and 6 th segments of the antennae externally 

 produced in to a process; legs shorter and stouter. 



a 1 . The tergites covered with rows of distinct rounded tubercles. 



a 2 . The anterior angles of the keels more squared and the lateral 



and posterior borders more conspicuously dentate; mostly 



with 4 rows of tnbercles concolor. 



b 2 . The anterior angles rounder , the lateral border scarcely denti- 

 culate and the posterior border weakly lobate ; mostly 5 rows 



of tubercles weberi. 



b l . The ornamentation of the tergites much less conspicuously tuber- 

 cular, more areolate; the lateral border more strongly dentate 



sumatranus. 



70. Cryptodesmus bicolor, sp. n. PI. XXI, fig. 5 — 5/ 1 . 

 Sumatra: Singkarah. 



Colour greyish brown above, the keels of the 6 th , 8 th , 11 th , 14 th 

 and 16 th somites flavous; sterna, legs and lower surface of head fia vous. 



Ç. Head sulcate above and very finely and closely granular ; smooth 

 and finely punctured below. 



Antenna short, clavate; all the segments short, the 2 nd , 3 rd , 4 th and 



