1887-88.] 



Galls of Norway. 



215 



Euura venusta, Zadd., 

 Nematus isclinocerus, Thorns., 

 N. Salicis-cinerece, Retz., 

 Aulax Hieracii, Bouche, 



galled petioles of Salix Caprea. 

 galls on leaves of S. ? phylicifolia. 

 pea-galls on leaves of S. nigricans. 

 stem-galls of Hieracium corym- 

 bosum. 



Hemiptera. 



Trioza Cerastii, H. Loew, , galled branches of Cerastium 



triviale. 

 Aphalara sp.? . , . folded leaf-margins of Epilohium 



angustlfolium. 



DiPTERA. 



Sciara tilicola, H. Loew, 

 Hormomyia Reauimcriana, Y 



Loew. 

 H. Ptarmicce, Vail., 

 H. juniperina, Linn., 

 Ceddomyia Frauenfeldi, Kalt. 

 C. ? TilicB, Schrk., . 

 C. Loti, De Geer, . 

 C. Vicice, Kief., 

 C. ? Onohrychidis, Bremi, 

 C. Ulmaricp; Bremi, 



a. sp.? .... 



C. Hieracii, F. Loew, 

 C. bursar ia, Bremi, 

 C. Caprece, Winn., . 



twig of Tilia parvifoUa. 

 leaf of Tilia parvifolia, 



flower-heads of Achillea Ptarmica. 

 on twigs of Juniperas communis. 

 leaves of Tilia parvifolia. 

 leaves of Tilia parvifolia. 

 flower-buds of Lotus corniculatus. 

 leaflets of Vicia Cracca. 

 leaflets of Astragalus alpinus. 

 leaves of Spirma Ulmaria. 

 leaf of Valeriana officinalis. 

 leaves of Hieracium ? murorum. 

 leaves of Nepeta Glechoma. 

 leaves of Salix Caprea. 



ACARIDA. 



All the mite-galls belong to the genus Phytoptus, distin- 

 guished from other mites by the long slender body, and the 

 possession of only four legs. The species are so much alike 

 that it is scarcely possible to distinguish between them, save 

 by the differences in the galls produced by them ; but fortu- 

 nately the galls are readily distinguished from one another, 

 even where two or more species occur on the same leaf. 

 Before the true nature of the galls was detected many of 

 them received names, without reference to the makers ; and 

 these names are still retained for convenience of reference, 

 and are given in brackets below. They fall naturally into 

 well-marked divisions, e.g., " nail-galls " {Ceratoneon and 

 Cephaloneon), scattered over the upper surface of the leaves ; 



