THE PsELAPHID@ OF NoRTH AMERICA. 23 
when taken conjointly, broader than long, narrow-shouldered, 
arcuate behind the middle, sutural lines entire, dorsal lines” 
well impressed at the base, abbreviated before the middle; 
shoulders rounded, unarmed. Addomen with the first dorsal 
three times as wide as long, bearing three transverse basal im- 
pressions, of which the middle one is smaller; the triangular 
margin is very narrow. Legs long, posterior tibize with a 
long, needle like spur; the @ tibiz are thicker and slightly 
curved; antenne with the joints cylindrical, decreasing in 
thickness from the first to the seventh; the eighth, ninth, and 
tenth, obconical, gradually larger, the eleventh acute-ovate. 
@ antennz of the same form but shorter. 
Habitat. Between the thirty-sixth parallel and the lakes. 
B. simpLex, Zec. Red or reddish yellow, polished; pubes- 
cence sparse. Length, 1,9 to 2mm. 
FHflead of 2 longer than wide, the frontal margin produced, 
retuse, front concave behind the margin; vertex broadly con- 
vex, smooth, foveze small, nearly nude, the circumambient sul- 
cus very shallow at the sides and in front; the part outside of 
this sulcus is finely scabrous. In the 2 the frontal margin is 
not produced and the entire vertex is smooth. Antenne regu- 
lar, with no sexual marks. Prothorax with the middle and 
lateral grooves deep, the two tubercles near the base stout, 
acute, and on each side near the basal angles are two small 
acute teeth; the lateral margin is flat from the bottom of the 
lateral groove outward. /ytra indistinctly punctulate, the 
shoulders acutely angulate, disk convex, sutural lines parallel, 
the discal ones hardly more than shallow, longitudinal, short 
impressions, from the third or external basal puncture. Addo- 
men polished, impunctate, the three basal, pubescent, trans- 
verse impressions equal in width, the median separated by 
two distinct short carine. Legs slender, the posterior tibie 
with a long terminal spur. 
Habitat. Northern Illinois, near Lake Michigan. 
B. cLososus, Zec. Red brown, polished, punctulate; pubes- 
