98 DECIDUOUS FRUIT INSECTS AND INSECTICIDES. 
than those of Scolytus rugulosus, the maximum length being about 
25 inches, with an average of 2+‘; inches. 
There are two complete broods each year—the summer brood and 
the fall brood, the latter being the hibernating one, the beetles ap- 
pearing in early spring. Beetles of the summer brood appear in 
maximum numbers during the last half of August, as shown more 
in detail in the following table: 
TABLE I.—Hmergence of summer brood of beetles of Phleotribus liminaris. 
Beetles Beetles 
Beetles from in- Beetles from in- 
Date. @ reared in | sectary on | Date. a reared in | sectary on 
cages. window | cages. window 
screens. screens. 
Jy 16232 aes ees a 2 GORI PATS S25: Sok ae ena nnere AQHA Seine aiveaees 
232 Re acca ae ee eee atta erate 30 263). Pace nha 60 1, 500 
2D Beer eco senocta Meese scees 74 | Dots meat eecereeete eeee 86 1, 000 
26-22 sheers aoe 83'scameeeeeee Bi) ee Sama ee Sale See 69 600 
DI] pen ate eee Sree | erase ete ae 300 | DO Rte Ese ya henner 72 1, 000 
DS sie Cone eee a em ae Neate serie este SED Sis fet iacet oaeeeece 154 200 
2G a See, ae ee SiON pea Gc deetne fe Rene pie yA hee TN eg ee ia oe 
Sil eee a Oe Bet an ed 82 450 DRE AME Sor sens ARE Ce 40 200 
U No taieie: ae Aen Sree gp eee GS aie hore eres ern a etait ee ate ee 67 TD 
Gee pee eet Se EN ll | ea TE 350 dO eae asa ates 18% |.) eee 
Geos eee cess 84 500 les ersten 2 Ae eee oer Pato fil NRE eden 5.9 
Qi See sed Be ctor Se IU OM USE r Seba e WB 235 Stet Me teehee 91 40 
Ae EE fe Fee aa 258 450 | ae ac peice sere BY Beene ar & 
DES Sah eos oan seaemeeee oe 1, 200 1 Rese ee ope tS 29) | wee ae 
BUG Bete sh ee es ee | a cre 750 TS a ae ne i dD al eats eae 
ee eh aia) co ae I we ee pare 750 DD Bis hae ee BP Aaa OA 
See Ree ek oles 317 1750 DAN OM AL eile comet te DAN a es eres 
USA Nts eae ee ieee ee 327 2,500 | 20 ree ee cei aie a Gi PSs ae 
DE token See, Sam eco IAS )al ge See See OGG. Qe Reh eee sence A Oe ooo ee 
@The first column shows beetles actually counted and taken from a breeding cage; the 
second row of figures shows, somewhat estimated, numbers of beetles gathered on screens 
at windows. All counts made between 4 and 6 p. m. 
bYhis table shows August 21 to be the date of maximum emergence of beetles. 
DESCRIPTION, 
Average length, 2.25 mm., average width, 0.75 mm. Body elongate, subcylin- 
drical, strongly punctured and with yellowish bristles arising from the punc- 
tures; color varying from light brown to almost black. Head globular, nearly 
vertical in front, anterior part fringed; eyes narrowly oblong, closely joined to 
the scape and extending about half their length below it; mandibles short and 
broad, distal part curved and strongly acute; mouth parts partly inclosed, gular 
suture distinct; funiculus of antenne five-jointed; club compressed, composed 
of 3 triangular segments; first joint longer than wide, globular; scape circular, 
clavate. Thorax almost cylindrical, strongly angled at caudal end. First and 
second coxze widely separated, globular; femur stout, outer edge serrated; tibia 
stout, compressed, lower half of outer edge serrated and ending in an apical 
tooth; tarsus stout, shorter than tibia, third joint bilobed, fourth indistinct, 
fifth as long as first and second together ; tarsal claws simple. Ventral side of 
abdomen and posterior edge of last segment strongly concave; elytra anteriorly 
rounded and deeply margined, sides parallel, surface with regular striz which 
contain circular, regularly placed depressions, elevated parts with yellowish 
bristles arising from faint punctures. 
