HYMENOPTERA. 87 
C. femorata; Tenthredo femorata, L.; De Geer, Insect., I, 
xxxiv, 1—6. Large; black; antenne and ovipositor of a brown- 
yellow; blackish-brown spots on the posterior margin of the 
superior wings; posterior thighs very large, in one of the sexes 
at least. 
The larva lives also on the Willow; it is green, with three 
stripes on the back, that in the middle bluish and those on the 
sides yellowish(1). 
Those species, in which the antenne present but three very distinct 
joints, the last of which forms an elongated, prismatic or cylindri- 
cal club, more slender, ciliated and sometimes forked in the males; 
and where the two costal nervures of the superior wings are very 
remote from each other, constitute the subgenus 
Hytoroma, Lat. Fab.—Cryptus, Jur. 
Some—Scuyzocera, Lat.; Cryptus, Leach, Lepel.—have four cu- 
bical cells, and the antenne forked in the males. The middle of 
the tibiz is destitute of spines(2). 
Others—Hylotoma properly so called—similar to the mueceding 3 in 
their wings, have their antenne terminated in both sexes by a sim- 
ple or undivided joint. Most of them—Hylotomes, Lepel.—have a 
spine in the middle of the four posterior tibiae. The larve or pseudo- 
caterpillars have from eighteen to twenty feet. 
Hi. rosx; Tenthredo rosz, L.; Roes., Insect., II, Vesp., II. 
Four lines in length; head, top of the thorax, and exterior mar- 
gin of the superior wings, black; remainder of the body saffron- 
yellow; tarsi annulated with black. 
~The larva is yellow, dotted with black; it gnaws the leaves of 
the Rose-tree. 
M. Lepeletier reunites to the Cryptus, Leach, certain species which 
only differ from the preceding ones in the absence of spines on the 
middle of the four posterior tibiz. 
Other Hylotomz, distinguished by the same negative character, 
but which have but three cubital cells, form his genus Péilia(3). 
(1) For the other species, see Oliv., Encyc. Méthod., article Cimbex; Fab.; 
Lat., Gen. Crust. et Insect., If], p. 227; Jurine, genus) Tenthredo; Panz., Hymen.; 
and the works already quoted. 
(2) Leach, Zool. Miscell., III, p. 124; Lepel., Monog., Tenthred., p. 52. 
(3) Lepel., Ib., p.49. For the other species of Hylotome, see the same work, 
the preceding one of Dr Leach, and the Monograph of the various genera of this 
family by Kliig. 
