SCOLYTID A—SCOLYTIN A—H YLURGINI. 159 
HYLESINUS Fabricius. 
An abundant genus with thirty or forty species widely distributed, 
with about half a dozen species found in the United States. Three species 
have been found fossil in Europe, two at Aix and one at Brunstatt, and a 
single species in America at Florissant. The Aix species are not so far 
away from ours, but the species here described is referred to this genus 
only on account of its general appearance, though the great size of the 
head alone would seem properly to exclude it. 
HYLESINUS EXTRACTUS. 
Py pebion 2 
The head is large, tumid, nearly half as large as the prothorax, smooth. 
Prothorax rectangular as seen laterally, a fourth higher than long, the sur- 
face closely and rather coarsely granular. Elytra more than twice as long 
as the prothorax, the outer margin flexed and margined precisely as in H. 
aculeatus Say, the surtace less coarsely granular than the prothorax, with 
faint sigus of longitudinal stria, not shown in the figure. 
Length, 2°77"; height, 1-2™"; length of teemina, 1°8™™. 
Florissant, Colorado. One specimen, No. 5647. 
HYLASTES Erichson. 
A genus almost confined to boreal regions in the two worlds, and of 
to} oD ’ 
which we have nine species in the United States and Canada. The fossil 
species placed here hesitatingly is known only by the burrows of the insect 
under the bark of juniper. 
HYLASTES ? SQUALIDENS. 
Scolytide sp., Scudd., Can. Ent., xvi, 194-196 (1886). 
Hylastes ? squalidens, Scudd., Tert. Ins. N. A., 468-469, Pl. 1, Figs. 23-25 (1890); 
Contr. Can. Pal. 1, 28-30 (1892). 
The borings of a beetle in a twig of juniper found in interglacial beds. 
given in my Tertiary 
coo) 
No further light has been thrown upon them than is 
Insects. 
Near Searboro, lake Ontario, Canada. 
