162 TRANSACTIONS OF THE 



Polygonum Persicaria, L. — Mr. Cameron lias observed, by tlie 

 banks of the Kelvin, the rolled and swollen margins of the leaves 

 of this plant produced by C. Persicarice, L. I have not met with 

 it myself, 



Urtica dioica, L. — ^The galls of C. Urticce, Perris, are very com- 

 mon at Carmyle, Milngavie, and other localities. They are leaf 

 galls, appearing as irregular swellings of mid-rib and principal 

 veins of leaf, mainly on under side of leaf showing but little above 

 upper surface. 



Salix Caprea, L., and cinerea, L. — (1) Leaf galls, occurring a 

 number on each leaf on mid-rib and principal veins, separate or 

 often more or less coalescent. Each gall is monothalamous, woody, 

 hemispherical above and conical beneath ; the larva emerging when 

 mature by apex of cone. These galls are produced by C. Caprece, 

 Winn. Common in Cadder Wilderness. (2) Swelling of the 

 stem, generally more or less globular, each gall being inhabited by 

 a number of larvae of C. Salicis, Schrank. Possil Marsh, Carmyle, 

 &c. (3) Rosette galls or Willow-roses. A terminal compact 

 cluster of leaves, imbricated, and leaving a central cell inhabited 

 by a single larva of C. rosaria, Loew. Cadder Wilderness and the 

 Kilpatrick Hills. 



Salix viminalis, L. — Folded margin of leaf, the work of C. mafr- 

 ginemtorquens, Bremi. Found at Carmyle. 



Fagus sylvatica, L. — Leaf galls, a number on the upper surface 

 of each leaf Cyliudrico-conic, pubescent, showing on under sur- 

 face only as a slight arching of the epidermis. Monothalamous, 

 thin walled, each containing one larva oi Hormomyia piligera, Loew. 

 Common in Cadder Wilderness. 



Pteris aguilina, L.— Rolled margin of leaflets, which changes from 

 green through brown to black, inhabited by the larvae of G. Pteridis, 

 Miiller. Very common on the moors in the neighbourhood of 

 Milngavie, and probably wherever looked for. 



This completes the list of galls formed by Cecidomyidse which, 

 up to the present time, I have found in the Glasgow district. It 

 is small, but I hope considerably to increase the number during 

 present and coming seasons. 



Outside the Cecidomyidse the only Dipterous gall-maker which 

 I have noticed in this district is the larva of one of the Muscidse 

 which lives in gall-like, curled-up, and distorted tips of the fronds 

 of Aspidium Filix-mas and Asplenium Filix-foemina. It is not 



