Hylocurus langstont (Blackman) occurs in the South from the 
East Coast to Texas. It breeds in the limbs and trunks of dying 
or recently killed honey locust, hackberry, mulberry, and slippery 
elm. Green poles and posts are also frequently attacked and dam- 
aged. The damage resembles that caused by powder-post beetles. 
The genus Micracis LeC. contains a number of species that 
breed in the wood or pith of their hosts. Adults are similar to 
those of the genus Hylocurus but differ in having the first joint 
of the antennae flattened and ornamented with long hairs. 
Micracis swainei Blackman, a widely distributed species in the 
South and Southwest, breeds in poplar shoots and in dead and 
dying twigs of red bud and willow. The adult is brown, and about 
2.7 mm. long. The terminal hook of the anterior tibia is strongly 
curved. M. suturalis LeC. breeds in the twigs and small branches 
of red bud and walnut, and M. meridianus Blackman breeds in 
the twigs and small branches of redbud and willow. 
The genus Micracisella Blackman was described by Blackman 
(78) to include certain species formerly included in the genus 
Micracis. Female adults have the antennal scape flattened and 
somewhat extended laterally and clothed with long hairs. 
Micracisella opacicollis (LeC.) is widely distributed in the 
Eastern and Southern States. It breeds in the pith of dead twigs, 
sprouts, and shoots of oaks, maple, redbud, and cypress. The 
adult is dark-brown to black and from 1.7 to 1.9 mm. long. M. 
nanula (LeC.) breeds in oaks and redbud from South Carolina to 
Florida and Texas. 
The genus Thysanoes LeC. is closely allied to the genera Hylo- 
curus, Micracis, and Micracisella, but differs in having the apex 
of the elytra broadly rounded. T. fimbricornis LeC. breeds in the 
twigs of red and black oaks, redbud, hornbeam, hackberry, hick- 
ory, and acacia from Pennsylvania to Texas. The adult is yellow- 
ish-brown and from 1.6 to 1.9 mm. long. Egg galleries are 
constructed almost entirely in the sapwood, nearly encircling the 
twig in a diagonal direction just beneath the bark. Larval gal- . 
leries run parallel with the grain. The related species, T. lobdelli 
Blackman has been observed breeding in oaks and maple in 
Mississippi and Georgia and T. berschemiae Blackman, in elm 
and rattan vine from Virginia to Florida and Texas. 
Members of the genus Pseudothysanoes Blackman are closely 
related to those of the genus Thysanoes. They differ, however, by 
breeding in the bark instead of the wood of their hosts. P. leconter 
Blackman attacks various oaks, hackberry, hop hornbeam, chest- 
nut, and walnut from Maryland and West Virginia to North 
Carolina. The adult is dark brown, shiny, and about 1.2 mm. long. 
P. rigidus (LieC.) breeds in basswood from Canada to Michigan, 
Ohio and West Virginia. 
The genus Cryptulocleptus Blackman is represented by a single 
species, C. dislocatus (Blackman), in eastern forests. The adult 
is brown and about 1.3 mm. long. The head is slightly concave at 
the middle, with a row of long hairs at the lower margin of the 
concavity. The antennal funicle is six-segmented, the club unseg- 
mented, and the scape armed with long hairs. It constructs its 
galleries just beneath the bark of twigs of its hosts. It has been 
recorded from hickory in West Virginia, the Carolinas, and Mis- 
sissippi, and from acacia in Texas. 
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