Malacoderm Genera Prionocerus and Idgia. 355 
densely, finely punctate, with rows of small scattered granules 
on the disc. Posterior femora moderately incrassate ; pos- 
terior tibie simply arcuate, of equal width to the apex ; 
anterior tarsal joints 1-3 with a black comb along their 
inner edge ; terminal dorsal segment broadly subtruncate at 
tip. Genital armature (Pl. XII. fig.31): lateral lobes mode- 
rately long, curved inwards at the tip as seen from above ; 
median lobe drawn out into an almost straight, blunt point. 
Length (excl. head) 8, breadth 24 mm. 
Hab. Cuyton, Hapulahani, Haldummulle (Mus. Brit.). 
Described from a single male, the only other specimens 
before me from the same locality, 9 2, being certainly 
referable to the closely allied J. dimelena, Walk., the ¢ of 
which has slender posterior femora, almost straight posterior 
tibiz, and a different genital armature. 
37. Idgia dichroa, sp. n. 
?. Elongate, shining, finely pubescent, and_ sparsely 
setose; luteous, the head (labrum included) black, the 
apical half of the elytra nigro-ceruleous. Head slightly 
produced in front, narrow, the labrum transverse, uu- 
impressed ; eyes very large, subcontiguous ; antenne long, 
slender, filiform, joint 11 elongate, feebly sinuate within, 
about 24 times the length of 10. Prothorax a little wider 
than the head, oblong-subquadrate, slightly sinuate at tlie 
sides posteriorly ; sparsely, very finely punctate. Elytra 
long, about twice as wide as the prothorax, densely, finely 
punctate, the seriately-arranged granules on the disc some- 
what conspicuous on the apical half. 
Length (excl. head) 10, breadth 3} mm. 
Hat. Borneo, Sarawak (A. R. Wallace, in Mus. Oxon.). | 
One female, in good condition. This species agrees with 
the description of J. longissima, Pic, from Sumatra, in having 
an unusually elongate eleventh antennal joint, differing from 
it in the entirely pale limbs, and in the shorter, relatively 
broader elytra, with much more extended bluish-black apical 
patch. J. semitecta, from Ceylon, is somewhat similarly 
coloured. 
38. Idgia semitecta, sp. n. 
g. Elongate, narrow, moderately shining, finely pubes- 
cent (the setz abraded) ; testaceous, the head (the labrum 
excepted) and nearly the apical half of the elytra black, the 
antennal joints 5-11 nigro-piceous. Head rather long, the 
