1887-88.] Galls of Norivay. 205 



of a midge {Cccidomyia ? Onohrychidis, Bremi), in the form of 

 inflated, conduplicate, yellowish-green, rather fleshy, isolated 

 leaflets, or terminal swellings on the young stems, made up 

 of a mass of ill-formed young leaves of the bud, the whole 

 mass being often about the size of a large pea. Often a 

 number of leaflets are galled on each leaf. No midge-gall 

 has been recorded previously from this species of Astragcdus, 

 so far as I can learn. 



Vicia Cracca, Linn. — Masses of galls occur on the tips of 

 the stems, reaching the size of a laro;e hazel-nut. These 

 galls consist of the pinnas of the younger leaves, near the 

 tips of the stems, all crowded into masses, the larger of which 

 are sometimes as much as 30 mm. in diameter. Each leaflet 

 is conduplicate, inflated, rather fleshy, and yellowish-green 

 or dull yellow. Occasionally some of the separate leaflets of 

 an otherwise healthy leaf are galled in this same way, 

 but remain isolated. Each leaflet is tenanted by one or 

 more larvse of a midge, probably Cecidomyia Vicice, Kieffer. 

 Similar galls are common on V. Cracca, as well as on allied 

 Leguminosffi, in Scotland ; C. Vicim has been recorded from 

 V. sepium in Lorraine. 



Prunus Padics, Linn. — In 1878 I found the leaves of 

 this tree near Christiania much infested with the galls known 

 as Ceratoneon attenuatum, Bremi, caused by mites {Phytoptus) ; 

 and last August I met with the same galls even more plen- 

 tifully in the Jordal valley, near the Buarbra; in Hardanger. 

 They belong to the type of " nail-galls," standing erect on 

 the upper surface of the leaf, to which they are fixed by a 

 narrow base. Usually each leaf bears a considerable num- 

 ber of the galls scattered irregularly over it. They vary a 

 good deal in form, some being spindle-shaped, others being 

 turbinate or oval, and warty. They are dull-green, yellow, 

 or red. In the Jordal the leaves very often bore the galls 

 intermixed with large spots of the fungus Pohjstigma fulvum, 

 Tul. The galls are abundant in Scotland, and are widely 

 distributed throughout Europe. 



Sinnca Ulmaria, Linn. — On this plant I found at Eide, 

 in 1878, galls of the midge Cecidomyia Ulmarim, Bremi. 

 They are scattered in the substance of the leaves, are about 

 the size of small shot, and are turbinate in form, the rounded 

 end projecting from the upper surface, and the conical end 



