Horn.) 576 [April 19, 
base slightly elevated, each alternate interval finely costiform, interspaces 
between these biseriately punctate. Body beneath moderately coarsely 
punctate. Length .14-.26 inch; 3.5-5.5 mm. 
This species varies in having the head and thorax rufous. 
Occurs from Pennsylvania to Louisiana, also in Oregon and 
Vancouver. 
Q. longiusculum Say, loc. cit., is described as differing from the above in 
the absence of the median line. It has.not been recognizcd since, and is 
considered doubtful, 
NEMATIDIUM Erichs. 
Antenne eleven-jointed, club two-jointed, basal joint short, oval, partly 
uncovered, second cylindrical longer than the third, which is also longer 
than the fourth, four to nine short, gradually but very slightly broader, 
tenth trapezoidal, eleventh larger than the tenth, oval at tip and pubescent. 
Head slightly convex, feebly deflexed, antennal grooves distinct, rather 
deep, oblique. Eyes moderately coarsely granulate, sub-truncate in front. 
Anterior coxze moderately separated by the prosternum which does not 
attain the hind margin of the thorax, the prosternal epimera meeting 
on the median line. Prothorax broadly concave at the sides for the recep- 
tion of the legs, the sternal portion obtusely elevated, the lateral margin 
nearly entirely obliterated. Metasternal side pieces entirely concealed by 
the elytra. Abdomen with segments gradually decreasing in length, inter- 
coxal process of the first very narrow and acute. Tibie with the apical 
angle prolonged, acute, and with two short terminal spurs. Tarsi slender, 
first joint elongate, longer than the next two together. Form linear, cy- 
lindrical. 
The Rynchophorous affinities of this genus are not few 
nor unimportant, for besides the structure of the thorax be- 
neath, the last joint of the antennz has the anterior face and 
entire free margin pubescent while the posterior face is en- 
tirely glabrous as in many Scolytide. The almost entire ab- 
sence of thoracic lateral margin 1s certainly a divergence 
from the Colydiide type, and an approximation to the Scoly- 
tide. 
One species is known in our fauna which I am entirely un- 
able to separate from a Brazilian form, and I am inclined to 
believe will prove to be cylindricum Fab. 
N. mustela Pascoe, Journal of Entomology, II, 1863, p. 34, pl. 3, fig. 
10; filiforme Lec. New Species, 1863, p. 68;? cylindricum Fab. Syst. 
Eleut. II, p. 657. 
Elongate, cylindrical, slender, piceous or brownish, moderately shining. 
