146 



genus, inhabiting the United States, it may be stated that about sixty spe- 

 cies were found in the vicinity of Detroit in a single season. 



Calodera Mannh. Of this genus, which is very easy to recognize, three 

 species were found near Detroit; three others are not rare in the marshes 

 near Cambridge, Mass. ; all the species live under very wet decaying 

 leaves and moss. 



Oligota pedalis Lee. Very rare under decaying leaves. 



Myllaena fuscipennis Kr. Not rare under stones, etc., near the Detroit Riv. 



Dinopsis americana Kr. Under decaying leaves in fall and winter, not rare. 

 " myllaenoides Kr. With the preceding, but much rarer. 



Tdchyporus nanus Er. aud T. maculipennis Lee. Both are common in 

 the grass at the foot of old oak trees. 



Tachyporus affinis Kirb. Kare in decaying fungus. 



Conosoma Knox'ti Lee. Not rare in fungus, in the fall. 



Bolilobius niger Grav. Very rare in fungus. 



Bryoporus rufescens Lee, B. testaceus Lee, Mycetoporus lepidus Grav., 

 M. americanus Er. and M. lucidulus Lee, occur rarely under decaying 

 leaves; M. flavicollis Lee is common in the same localities. 



Heterothops fumigalus Lee 1 Common under decaying leaves. 

 " pusio Lee Very rare. 



Philonthus blandus Grav. and Ph. laetulus Say are two quite distinct spe- 

 cies; both are to be found not rarely in fungus. 



Xantholinus cephalus Say. Common under bark of several kinds of trees. 



Thinobius Kr. A single specimen of an undescribed species was found by 

 sweeping on a swampy meadow; a second species occurs in California. 



Trogophloeus Mannh. This genus seems to be very rich in species, fif- 

 teen or sixteen species being observed by us near Detroit. 



1 somalus pallidas Lee A single specimen in a little ditch, after a heavy 

 rainstorm. 



Pseudopsis sulcata Newm. Several specimens in decaying fungus. 



Bylhinus zonatus Br. Two specimens sifted from sphagnum moss. 



Trimium dubium Lee Not very rare under dry old leaves. 



Catops brunneipennis Mannh. Several specimens under decaying leaves. 



Colon dentalum Lee and two other species of the same genus, Anisotoma 

 punctatostriata Kirb., A. collaris Lee, A. obsoleta Melsh., Cyrlusa egena 

 Lee, C. picipennis Lee, Colenis bnpunctata Lee, Clambus globulus Lee, 

 Cybocephalus nigritulus Lee, etc., are found by sweeping meadows at sun- 

 set, in the latter part of June. 



Anogdus laevis Lee Several specimens under old bark, in August. 



Clambus puberulus Lee On a window of a stable, not rare, in August. 



Orlhoperus glaber Lee and two other species of the same genus, by 

 sweeping on grass. 



Baeocera concolor Fabr. and B. apicalis Lee Rare in fungus. 



1 An undescribed species of Tanygnathus Er. occurs in Florida. 



