THE AUSTRALIAN. NATURALIST. 189 
Heterognathus carinatus, King —Taken in the nest of 
Trid. rufonger. 
Heterognathus sp.—F rom the nest of Hwponera lutea. 
These species are all of a yellowish brown colour, and the 
elytra entirely cover the abdomen. The largest mentioned 
sp. is only 144 mm. 
Family TRICHOPT ERY GIDAE. Rodwayia orientalis, 
Lea.—Taken in the nest of Hclatomma metallicum. 
Rodwayia sp.—In the nest’ of Polyrhachis ammon. 
These are small oval beetles, yellowish in colour, and not 
more than 34 mm. in length. They are without eyes. 
Family HISTERIDAE, Chlamydopsis agilis, Lea— 
This is an extremely rare insect, the specimen which I was 
fortunate enough to secure being the fourth one recorded. It 
was not until the nest had been opened several minutes 
that the beetle was seen crawling slowly out of one of the 
tunnels. Taken at Hunter’s Hill, 28/6/15, in the nest of 
Ectatomma metallicum. This beetle is of a dark brown 
colour, and about 3 mm. in length. The hind legs are 
almost twice the length of the body. 
Chlamydopsts epipleuralis, Lea—This is perhaps the 
most common of all the Chlamydopsis about Sydney 
(though they are all rare), numbers of this species havy- 
ing been taken in a single large nest. Live specimens are 
easily seen in the nest being reddish-yellow in colour. The 
ant, Iridomyrmex gracilis, is black. Length of beetle, 
234 mm. 
Chlamydopsis serricollis, Liea—A specimen of this 
beetle, taken by me at Como during June, was in a little 
excavation in the floor of the nest, this excavation being 
the exact size of the beetle and deep enough to allow the 
elytra to come level with the surface. The beetle was 
black in colour, but beimg somewhat covered with dust, 
would very easily have been passed over had it not been 
for the minute golden spot on each elytron. Another 
specimen was taken at. Oatley during September. Length, 
214 mm. 
(Chlamydopsis), Ectatommiphila opaca, Lea.—Whilst 
collecting at Oatley during September, 1916, I observed in 
the nest of Hctatomma metallicum two Ectatommiphila 
opaca, in different parts of the nest. One was of the usual 
