256 Mr. F. Smith on new Genera and Species of Tenthredinide. 
the legs black. Abdomen ochraceous ; the four apical segments 
black, the first of the black ones tinged with reddish yellow in 
the middle; the sides of the abdomen have also a slight reddish 
tinge. 
Captured by Mr. H. W. Bates at Ega, Brazil. 
This species is unique in the National Collection, and was 
acquired in 1858, since which period it has been ticketed as a 
new undescribed genus; it is certainly the finest addition that 
has been made to the family Xiphydriide for many years. 
Genus Srrex, Linn. 
Sirex cedrorum. 
S. capite nigro, pone oculos flavo; pedibus flavis, femoribus basi 
tibiisque apice nigris ; abdomine supra fascia nigra ante apicem. 
Female. Length 1 inch. Black; the head with thin black 
pubescence ; the base of the mandibles and anterior margin of 
the clypeus obscurely ferruginous ; the antennz and head behind 
the eyes luteous. Thorax rugose, with the pro- and meso- 
thorax laterally obscurely testaceous, thinly covered with short 
black pubescence; wings yellowish-hyaline, with the nervures 
and costa ferruginous ; the posterior femora and the base of the 
anterior and intermediate pair black ; the posterior tibize black, 
with their base yellow. Abdomen with a silky gloss; the two 
basal segments, and a narrow fascia at the base of the seventh, 
yellow; the eighth and ninth segments yellow, the former with 
a black fascia at its apical margin, which extends narrowly over 
the base of the apical segment. 
This species was found in a portion of the trunk of one of the 
cedars of Mount Lebanon ; it closely resembles the Sirex gigas, 
but appears to be distinguished by too many differences to con- 
stitute a variety of that insect; the most prominent differences 
are the head being entirely yellow behind the eyes, the posterior 
tibizee nearly entirely black, and the abdomen haying a black 
fascia at its apex; the anterior margin of the clypeus is 
slightly produced in the middle, and very coarsely punctured ; 
in S. gigas it is finely roughened, with its margin smooth 
and rounded. The male differs from the same sex of S. gigas 
in having only the extreme base of the abdomen and the apical 
segment black; the head is also entirely yellow behind the 
eyes. ’ 
Genus CLADOMACRA. 
Antenne composed of sixteen joints, pectinated and pilose ; 
head transverse ; eyes ovate and very prominent. Wings ample, 
the anterior pair with one marginal and four submarginal cells, 
the first subovate and smaller than the second, the second and 
