124 
THE ORDER OF COLEOPTERA. 
is often as long as all tlie others united. They are mostly found under 
the bark of dead or decaying trees. The larvae of some foreign species 
of Uloma have been found in flour and in bake houses, like those of 
Tenebrio proper. The species of the genus Hypophloeus, as the name 
implies, live under the bark of trees. These, which are our two most 
common and typical genera, may be thus distinguished : 
A. Labrum attached directly to the front ; anterior tab® dilated and toothed on the outer edge ; size 
about medium - TJloma. 
A A. Labrum separated from the front by a membranous olypeus ; anterior tib® somewhat widened 
but without tooth ; sizo small Hytophlceus. 
Uloma contains five N. American species. The U. impressa, Melsh, 
is a common insect, found in old logs and stumps in ah advanced stage 
of decay. It is between four- and five-tenths of an inch in length, and 
of a deep mahogany-brown color. It was formerly considered identical 
with the U. culinaris of Europe. The U. imberbis and the U. punctulata , 
Lee., are similar, but only about three-tenths of an inch long, and of a 
lighter color. The former is distinguished by having the last joint of 
the antennae obliquely truncated and pointed. The other two species 
have not been found east of the Mississippi river. Hypophloeus contains 
three species. They resemble Uloma in form and color, but are only 
about three-twentieths of an inch in length. 
Tuibe XV. 
HETEEOMEROUS FUNGUS-BEETLES. 
Heteromera fwngicola. Taxicornes mostly, Latreille. 
The insects of this small tribe so closely resemble the heteroinerous 
ground beetles in their organic details, that they are merged by Lacor- 
daire in his comprehensive family of Tenebrionidse. They are, however, 
usually easily distinguished by their general form and color, and their 
short perfoliate antennae, besides the other characters mentioned in the 
general description of the tribes of the heteroinerous section. But they 
are especially distinguished by their fungivorous habits. The only other 
insects in this section which are known to us, in this country, having 
similar habits, are the two species of Tetratoma, in the family of Me- 
landryidae. 
They are usually found, in all their stages, in the fungi which grow 
upon trees ; but they are sometimes found under decayed bark, where 
they are supposed to feed upon the small fungi which grow in such sit- 
uations. They comprise the family Diaperidae. 
