HORN EXPEDITION—COLEOPTERA. 
271 
insequaliter (sc. et grosse et subtilius) spar.sim punctulatis, latera versus 
iuEequaliter (liic grosse illic inagis su})tiliter) rugulo.sis ; abdoinine in parte inediaiia 
grosse sparsim ad latera crel)re subtilius puuctulato, segniento basali in medio 
loimitudinaliter concavo. 
O 
Maris segmento ventrali apicali profunde triangulariter emarginato. Long. 
13 1. Lat. 1. 
This insect belongs to tlie same group of Chahotcenia as tlie otlier species of 
tlie Horn collection. It is a long narrow species, distinguished from most if not 
all of its immediate allies by its basal ventral segment being longitudinally concave 
in the middle. The collection contains a female Chalcotcenia, which I have little 
doubt belongs to this species, although it is much smaller than the male (Long. 
IOI 7 !•)) since it agrees in all specific characters (especially in having its basal 
ventral segment sulcate). The hind margin of its apical ventral segment is 
rounded, but has a small notchdike emargination in the middle. I may add that 
I have not attempted to set forth a comparison of the Chalcotcenue of the Horn 
collection with the allied species (C. australasice^ etc.) from North-west Australia 
and Queensland, because I am not certain that my identification of the latter is 
correct; I, however, possess examples that I refer to them with very little doubt, 
and these are quite distinct from those of the Horn collection. 
Crown Point. 
MERIMNA. 
M. atrata, L. and G. (1), Alice Springs. 
ELATERID^. 
MONOCREPIDIUS. 
The collection contains a single example each of two small species pertaining 
to this genus. One of them (from Palm Creek) is considerably broken, and the 
other (Tempe Downs) has an immature appearance. In so difficult a genus as this 
it does not seem desirable to found new species on unique specimens —at least 
unless they present' strongly-marked characters, which these do not, especially 
when (as in the present case) their condition is such as to render it very difficult 
to determine by description whether they have not already been named. They do 
not seem identical with any Motiocrepidii in my collection. 
