312 
COLEOPTERA. 
lives in the plains of India but is rare. Motschulsky described five 
Indian and one Burmese species of Byrrhinus. Four other species are 
described, Chelonarium indicum, Grouv., being the most widespread. 
Georyssid^;. 
Antennce nine-jointed, three forming a club. 
Tarsi of four joints. 
A tiny family of beetles distinguished on the above characters 
and chiefly found burrowing in soil in the Northern Hemisphere. 
Two species of Georyssus occur in Ceylon. 
Heterocerid,®. 
Antennce with a long seven-jointed club. Tarsi four-jointed. 
Semi-aquatic beetles found burrowing in the mud of river-banks 
and tanks. They are capable of stridulating and on being seized, emit 
Fig. 192.— Heteroce- 
RUS MARGINATUS 
LARV£. 
{From Chapuis.) 
a sound. The life-history of the European species is known, the pub¬ 
escent larvae burrowing in mud. Little is known of the Indian species, 
six species being recorded. They are common in freshwater in India 
and come freely to light. The beetle is probably predaceous, feeding 
on the insect life of its habitat which is abundant and having its body 
and strong expanded legs formed for burrowing in the wet mud in 
which it lives. 
Fig. 191.— Heterocerus sp. 
