The Scottish Naturalist. 15 



its teeth minute, placed wider apart towards the base. 

 The mandibles of the perfect insect are very sharply pointed, 

 the point has its edge very minutely dentate ; the mandibles of 

 the larva are very blunt. Probably the sole use of the mandi- 

 bles in the imago is to cut the lid of the cocoon ; I never 

 observed the imagos eat anything, nor could I find traces of 

 food in their stomachs. The perfect insects maybe discovered 

 congregating in numbers on the willow leaves towards the end 

 of May and beginning of June. 



The male is quite unknown to me, and this appears to have 

 been also the case with Hartig. In all probability they, like 

 Cytiips lignicola and other Cynifiida, propagate without the aid 

 of the male sex. 



Further information regarding this interesting species may be 

 found in Swammerdam's Book of Nature (where it is figured in 

 all stages), p. 286, pi. 44; Reaumur, Memoires, Tome 3, 

 p. 435, pi. 37 ; Rosel, Inst. Belust. Vol. 2, Bomb, et Vesp., 

 pi. 10 ; Ratzeburg, die Forstinsecten, p. 128, Tab. III. ; Thom- 

 son, Hymenoptera Scandinavian, 1, 162 ; Miiller, Ent. Mo. Mag. 

 6, 29 (under Nematus saliceti Fallen). 



In a future paper I shall give an account of the numerous 

 inquilines and parasites of Nematus gallicola. 



Explanation of Plate I. 



1. — Nematus gallicola. 2. — Galls on Salix/ragilis. 3. — Galls on S. alba. 

 4.— Larva. 5. — Cocoon. 6. — Saw. 7 — Fore-wing. 



Figures x, 4, 6, and 7 are magnified. 



Occurrence of three species of Tenthredinidse new to Britain.— 



While at Rannoch, in 1871, I beat from the Scotch fir examples (females) of 

 Lophyrus pallipes Fall., and of Lophyrus virens Klug., two saw-flies not 

 previously met with in this country. I also captured there Strongylogaster eiorina 

 Klug., a saw-fly which is likewise new to Britain. This year, in June, I took 

 eight specimens of the latter insect by beating sallow bushes in the Glenelg 

 Valley, Inverness-shire. — P. Cameron, Jr., 136 West Graham Street, Glasgow. 



Occurrence in Scotland of Trigonaspis megaptera Panz. — About the 

 end of May, I found the galls of Trigonaspis megaptera Panz., in Cadder and 

 Kenmuir Woods, near Glasgow. All the galls were, as Hartig states, placed on 

 very young shoots. The perfect insects emerged on the 8th of June. I never 

 could find the galls after that date ; it is probably single brooded.— Id. 



