256 Mr. F. Smith on new Genera and Species of Tenthredinidae. 



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 Xiphydriidse for many years. 



Genus Sirex, 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 antennae 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 tibiae 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 

 tibiae nearly entirely black, and the abdomen having 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. 



Antenna 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 



