272 
COLEOPTERA. 
COSSYPHODID^E— 
Cossyphodinus indicus, Wassm. 
Tenebrionid^— 
Dichillus tenellus, Wassm. 
Schizillus Rogersi, Wassm. 
Tetranillus costatus, Wassm. 
Stenosis dentipennis, Wassm. 
„ wroughtoni, Wassm. 
with Pheidole sulcaticeps, Rag. 
Ahmednagar. 
,, Holcomyrmex scabriceps, Mayr. 
Ahmednagar. 
„ Pheidole indica, Mayr. Mus- 
soorie. 
„ ? ? Ahmednagar. 
„ Cremas tog aster sp. Thana. 
„ Pheidole latinoda. North 
Gujarat. 
Rhysodidjl. 
Head with a slender neck. Antennce filiform, eleven-jointed. Tarsi 
five-jointed. Abdomen of six joints, basal three 
connate. Front tibiae notched on inner edge. 
A small family of two genera ; they are elongate, the integument 
hard and with longitudinal impressed lines ; all are coloured black or 
brown. The few known species have been found under the bark of 
trees. Lewis revised the family in 1889 (Ann. Nat. Hist. VI, Yol. 2) 
and listed forty species of Rhysodes and Clinidium, of which C. apertum, 
Reit., R. aterrimus, Chevr., is Indian and R. taprobance, Fairm.. is known 
from Ceylon. Three species of Rhysodes have since been described by 
Arrow. 
Dytlscid^e. 
Aquatic beetles, the posterior coxce enlarged, the antennce filiform. 
Hind leg formed for swimming. Males with the three 
basal tarsal joints of foreleg dilated. 
These beetles are readily distinguished by the above characters 
from other aquatic beetles. They are practically aquatic Carabids 
with the bodily form and appendages modified to suit their mode of 
life. They include some of the larger beetles and many small forms: 
the colouring is sombre and probably renders the swimming beetle in¬ 
conspicuous. The form is oval, the parts very closely united to form 
one continuous whole with no projecting angles or lines ; the head is 
broad, tightly fitting and only capable of slight movement. The trophi 
are similar to those of the Carabidse, the biting carnivorous type. 
