Dury: Coleoptera of Cincinnati. 139 
muddy shores of streams. They cover themselves with mud, so 
they are very difficult to see, consequently but few of our col- 
lectors get them. Our only species is 
GEORYSSUS. 
G. pusillus Lec. 
PARNID. 
This is an aquatic family, that live submerged in running water, 
clinging to flat stones or logs. Their larvee are flat, thin creatures 
that do not look like the larve of an insect. I have found the 
seven species that we take here, together with the larve of some 
of them, adhering to submerged logs and stones in the swift run- 
ning water of Mill Creek and the Little Miami river. By taking 
an old limb or rough stone from the water at a suitable locality 
and placing it in the sun, the insects will move as the water dries 
off, although at first nothing can be seen of them, so perfectly do 
they resemble the surface on which they rest. In Trans., V. 3, 
1870, p. 29. Dr. Horn has a synoptic paper on them. 
BEE ROCERIDAS. 
A family of rather elongate, convex, pubescent, mud colored 
beetles, that burrow in the mud. The foretibiz are broad and flat- 
tened, enabling the insect to dig out of sight with great celerity. 
When the mud flat in which they are concealed is shaken or water 
poured over it, they rush out of their burrows and take flight. 
Dr. Horn has an admirable paper on the N. A. species in Trans., 
Wome VAT Sp: °k, 
HETEROCERUS. 
H. ventralis Mels. H. collaris Kies. 
H. undatus Wels. H. pusillus Say. 
H. brunneus JZels. 
DASCYEEMD A. 
A family of rather soft texture and small size, variable in color. 
Some are found on dead timber. One species of Ectopria, I have 
found clinging to a stone submerged in a swift running creek, 
June 20. | 
PTILODACTYLA. 
P. angustata Horn. 
EUCINETUS. 
E. oviformis Lec. FE. terminalis Lec. 
E. morioLec. 
