196 The Scottish Naturalist. 



ordinary creature to our readers. We have reason to believe 

 that our specimen is the only one of the species that has been 

 found on the British coast since the year 1681." I may re- 

 mark that Donovan's fish had two long canine looking teeth in 

 the lower jaw, and that the species has been taken several times- 

 at St. Andrews since his day. 



St. Andrews, November, 1873. 



MEMOIRS ON SCOTTISH TENTHREDItflDH. 

 Bv P. CAMERON, Jun. 



No. IV.-NEMATUS VIRESCENS. 

 Nematus virescens, Hartig., Blatt. und. HolzTvespen. 217; 50. 



(1837)- 



Nematus viridis? Stephens. III. Brit. Ent. vii. 30, 13. (1835). 



THE eggs of Nematus 7' ires ecus are laid on the upper surface 

 of the leaves of Salix viminalis and other sallows, and 

 on those of Alnus glutinosa. They are oval, dark green, pro- 

 jecting above the surface of the leaf, and not very deeply em- 

 bedded in the epidermis. Seven to ten are deposited on a 

 single leaf, at a distance of two or three lines from each other, 

 and never on the nerves. When the young larva escapes from 

 the egg, it commences to eat a round hole, which by degrees 

 reaches the edge, along which the older larvae are usually 

 found. 



The larva is cylindrical, about 9-10 lines in length. Head, 

 a little larger than the second segment (except when young), 

 shining grass-green, thinly covered with hairs ; eyes situated in 

 a black line, which extends to the top ; a small dot beneath the 

 eye. The top is sparingly covered with small dots. Mouth 

 brownish ; mandibles brown, black at the tips. Feet glassy 

 yellowish-green, slightly hairy ; claws brown ; a curved black 

 line over the feet. Fourteen claspers, light-green. Body grass- 

 green, with a black line on each side, at the top, on the edge, 

 and directly over the feet and claspers the folds of the skin are 

 marked with black lines. The dorsal lines end, or get very 

 faint, at the twelfth segment ; the anal segment is hairy, with two 

 prongs, the tip often bright red. 



