22 TRIOHIOSOMA LUCOEUM. 



rently distributed and coloured, it being long and red- 

 dish at the base, short and fuscous in the middle, and 

 longer and yellowish at the apex, while in vitellinad the 

 colour is uniform, and scarcely longer at the apex than 

 at the middle. 



The larva feeds on Sorbus (or Pyrus) aucuparia in 

 August and September. Its head is small, ochreous- 

 yellow, granular ; on the vertex are two reddish marks, 

 which are frequently almost, if not quite, united. 

 Mouth brownish, mandibles blackish. Body yellowish- 

 green ; the skin beset with numerous tubercles, which 

 are white, but may have a yellowish tinge, and are 

 much larger over the legs and along the dorsal vessel 

 than over the rest of the body ; there are none on the 

 anal segments. Legs white, with dark brown claws, 

 the ventral legs are glassy green. Spiracles elliptical, 

 pinkish-red. The clypeus and the part immediately 

 over it whitish, without the ochreous colour. 



"When young it is whitish-green with white tubercles, 

 the skin thickly powdered ; the head is pale ochreous- 

 yellow. 



Tryphon sorbi, Saxs., and Mesoleius rufus, Gr., are its 

 parasite. 



The species, according to von Siebold, is partheno- 

 genetic. 



Not common. Darenth and Coombe Woods (Ste- 

 phens), Lake District (King), Braemar, Glen Lyon. 



Continental distribution : Sweden, Germany. 



3. TRICHIOSOMA LUOOEUM. 



Vol. I, Plate X, figs. 5 and 5 a, Ovipositor ; fig. 8, Coxa 

 and Trochanter. Vol. II, PI. XI, figs. 10 and 

 10 a d, Larva. 



Tenthredo lucorum, Lm., S. N., i, 555, 4 ; F. Su., 389. 



Trichiosoma sylvaticum, Leach, Z. M., in, 108 ; Ste., ill., vii 9 1 

 Latreillii, Leach, 1. c ., 110; Ste., 111., vii, 9, 3.' ' 

 unidentatum, Leach, 1. c., Ill ; Ste 1 c 10 7 

 pusillum, Ste., 111., vii, 11, 8. 



