HYMENOPTERA. — TENTHREDINIDZ. 101 
larvee (Mem. tom. ii. pl. 35. f.19, 20., adding figures of simple, bifurcate 
and 4-furcate spines); he was, however, unable to rear it. Hartig 
has figured another similar larva, found on the oak (tab. 5. f. 27—30.), 
and which he gives as that of Tenthredo bipunctata (p. 262—277.), 
forming it (with some others) into the subgenus Hoplocampa, from 
the spines with which the larve are armed. Réaumur (Mem. tom. v. 
pl. 12.) has figured two species of these armed larvae, found upon the 
oak and Prunus domestica; Lyonnet has also described one of these 
species of spined larve, found upon the oak (Mém. Posth. pl. 15. 
f. 1—12.), which he succeeded in rearing to the perfect state, and 
which De Haan doubtingly gives as the Dolerus hematodes of Klug. 
De Geer (tom. ii. pl. 38. f. 11—13.), Réaumur (tom. v. pl. 12. f. 17, 
18.), and Dahlbom, have figured a very curious 20-footed larva, found 
upon the alder, having the body flattened, and greatly resembling the 
larvee of the butterfly genus Thecla, or the flattened Aselli. Neither 
of them were able to rear it, nor has Hartig been able to point out 
the group to which it belongs; he, however, introduces it into his 
great genus Tenthredo, copying De Geer’s figure (pl. 5. f. 41.). 
Lyonnet (Posth. Mém., pl.14.) has given complete details of the 
various states and structure of an undetermined species of Dolerus ? * 
of which the larva is 22-footed. 
The 20-footed larvae of Selandria cerasi Linn. (/Ethiops Fab.), 
which feed upon the leaves of plum and other fruit trees, are remark- 
able for the entire covering of greenish black viscid matter with which 
they are clothed, and which exudes from the sides of the body. By 
day they remain quiet upon the surface of the leaves, with the head 
withdrawn into the prothoracic segment, and the latter distended ; the 
legs are also concealed, so that the insect has not the least appearance 
of animation, and looks more like a small portion of slime (fig. 71. 8.). 
(De Geer, tom. ii. tab. 38. f. 16—24. ; Reaumur, tom. v. plate 12. f. 1— 
4.; Bouché, Naturgesch. Ins. p.137.; Westwood, in Gardener's Mag. 
No. 92. November, 1837.) This, together with some allied species, 
has thence been formed by Hartig into the subgenus Blennocampa. 
(See his pl. 5. fig. 31.) 
To this subgenus also belongs the “ slug worm” of North America, 
which occasionally commits so much injury on the cherry, pear, plum, 
* The antenne are described as only 7-jointed, but are represented as 8-jointed ; 
but evidently incorrectly, as no species of the family has yet been described with 
eight joints, 
H 3 
