14 
NORTH AMERICAN THROSCIDAE 
which Dr. Horn, however, described as invisus. The latter 
author very evidently referred the females of constrictor to punc- 
tatus, a specimen so labelled having been sent me by Dr. Skinner 
from the Horn collection. Dr. Horn also so named specimens 
which I sent him on two or three different occasions. It would 
appear that neither author had seen the male. 
Specimens have been seen from Massachusetts, New York, 
Pennsylvania, New Jersey, Maryland, Virginia, Ohio, Michigan 
and Iowa. 
5. Aulonothroscus validus LeConte 
Elongate, robust, punctuation fine. Head clothed with very fine pubes- 
cence, the longer hairs fine, the very finely, densely punctate surface plainly 
visible through the pubescence. Head convex, finely, sparsely punctate; eyes 
small, alike in the sexes, with a minute emargination, orbits narrowly im- 
pressed. Antennal club with joints slightly produced laterally in the female and 
scarcely more so in the male, the pubescence not conspicuous. Pro thorax 
convex, sides at hind angles a little more dilated and explanate and more ob- 
lique to the anterior angles in the male, rather strongly arcuate in the female, 
distinctly, broadly bi-impressed at base, side margin fine, reaching from base 
to anterior third or fourth, hind angles not evidently carinate, surface ex- 
tremely minutely, rather closely punctulate and vith rather sparse variolate 
punctures, finer anteriorly and at the sides, coarser at the middle and base. 
Elytra elongate subparallel, broadly and obliquely impressed behind the 
humeri, surface minutely punctulate, striae very fine with rather distant, 
minute punctures, coarser toward the base, intervals rather sparsely, irregu- 
larly, variolate punctate (the sutural with a single series of minute punctures) 
becoming somewhat uniseriate behind, coarser and confused at apex. Last 
dorsal feebly projecting at apex. Prosternum coarsely variolate punctate in 
front, more finely and much more sparsely behind, striae reaching from base 
to middle or a little beyond; sides rather coarsely and sparsely variolate 
punctate. Metasternum very finely and sparsely punctate at middle, the 
punctures a little larger anteriorly, more coarse, dense, and variolate at sides. 
Abdomen sparsely variolate punctate along the middle, more closely and 
coarsely at sides, and especially on the last ventral. Length 2.5 to 5 mm. 
The male has the long soft pubescence of the metasternum 
seen in several other species, but rather less developed in area 
apparently. The females seem to far outnumber the males in 
collections. The lateral carinae of the clypeus are usually quite 
distinct, limiting the antennal fossa, but they are also sometimes 
feebly evident in punctatus, constrictor, calocerus and laticeps. 
Northern counties of California to Lake Tahoe, also in Santa 
Clara County; Nevada; Oregon; Washington; Vancouver, 
British Columbia. 
