‘94 Le Conte on the Pselaphide of the United States. 
cient = considering that there still remain four species of which we know 
only on I have found that in this genus, the most closely allied species pos- 
sessed Ter Mad characters; therefore, observing ya in the two sexes of 
B. ferox there was no difference in the structure of the head and antenne, I con- 
cluded that the two females (5 and 6) were each ie from the two males, 
(2and 3.) The other three species, of which one sex is deficient, will p admitted 
without difficulty, as in each instance the individual described has been 
In the Northern States an individual of this genus is scarcely ever seen pe from 
a colony of ants, but in the South, they are quite frequently found under the bark of 
trees, where no ants are to be seen. The northern species, as far as my experience 
goes, are found decis — stones; $ the southern ones, (except B. Jone and a few 
EDT 
1. B. Ione. Rufus, capite leviusculo, vertice tubercu- 
lato, thorace 3-lineato, antennis crassiusculis. Long. .10. 
Specimina duo ad montis lone Georgie apicem cum form- 
ica parva nigra, opaca, pedibus antennisque rufo-piceis, Maio 
inveni. i 
Rufus pubescens. Caput ad latera vix conspicue scabrum, 
vertice valde elevato, obsolete foveato convexo, sulco semi- 
circulari lato profundo definito. Antenne crassiusculs, artic- 
ulis 2—8 æqualibus, 9 et 10 sensim parum majoribus, 11 lon- 
giore crassiore, ovali, apice acuto. Thorax sub campanulatus, 
lateribus rotundatus, fortiter 3-lineatus tuberculo utrinque parvo 
acuto versus basin. Elytra parce vix punctulata, humeris trun- 
catis, angulo obtuso, stria dorsali ante medium abbreviata. 
Pedes valde elongati, tibiis posticis calcari brevissimo, vix cer- 
nendo. 
Mas articulo antennarum ultimo intus ad basin dentato, 
praeced. 3 longitudine eequante. Femina, antennarum art. 8" 
paulo minore, 9 et 10 sesqui crassioribus eequalibus, 11™° præ- 
ced. 2 :equante, basi BR. 
A. 
2. B. armiger. Rufus, capite E vertice elevato, 
3-cristato, sulco lato circumcincto, antennarum articulo 10™ 
globoso, ultimo longissimo. Long. .09. 
Habitat in Pennsylvania cum formica media rufa. 
Rufus, parce pubescens, Caput magnum, leviter scabrum, 
lateribus postice acutis, vertice. elevato, 3-cristato, sulco cit- 
[i 
