428 DR. T. A. CHAPMAN ON THE SPECIES (Apr. 27, 
In another direction the hard or spinous process dwindles to 
small dimensions, retaining many teeth, as in dilecta, lanka, &e. ; 
culminating in species in which it is very small, as in placidula, 
melena, &c.; and finally wanting, as in plauwta. ‘There are other 
species that seem each to be a law to itself, such as albocwrulea 
and transpecta. 
A group might be made of those that have, not a hook, but a 
spine to the dorsal process; it would not, in regard to the clasps, 
be a natural group. It appears to include Limbata, marginata, 
phillippina, nedda, acesina, camene, argiolus. 
T propose to place first those with several large teeth to the 
spinous process. 
4. corythus de Nicév. J. B. N. H.S8. ix. p. 2738, pl. O. figs. 16, 
17.—Sumatra. 
The appendages belong to the group with long teeth in the 
spinous process of the clasps—nedda, acesina, shelfordi, musina. 
The dorsal processes have a definite spine and a button-like 
ventral accessory. 
Text-fig. 57. 
corythus (Sumatra, Druce Coll.). XX 32. 
In the British Museum specimens of musing are placed under 
this name, which led in my earlier examinations to my believing 
corythus and musina to be the same species (Proc. Zool. Soe. 
1908, p. 677). They are abundantly different in all respects. 
