138 BRITISH GALLS 



Foa nemoralis Linn. 93. Wood Meadow Grass. 

 Diptera Medium or upper part of the stem swollen above a node. 



From the swelling issue numerous root-like filaments 

 which curve around the stem. Each gall has a single 

 cavity containing numerous larvae. M. G. 



Mayetiola poae Bosc; 56 

 Syn. Hormotnyia f)oae Bosc. 

 Cohnpid, Plant Galls, fig. 245. Houard, No. 264^ 

 Nematoda Plant bulbous at the base of the stem. 



Tylenchus devastatrix Kiihn 57 

 Fungi Fusiform swelling near the apex of the stem. See 



No. 34. 



Epichloe typhina Persoon 58 

 »> Poa pratensis Linn. 112. Smooth Meadow Grass. 



Fusiform swelling on the stem. See No. 34. 



Epichloe typhina Persoon 59 

 FestTica ovina Linn. 112. Sheep's Fescue Grass. 

 Hymen- Irregular yellowish-green swelling on the stem, situated 

 optera above the first or second node. M, G. Imago appearing 

 in spring. 



Isosoma depressum Walker 60 

 Syn. Eunra depressa Cameron. 

 Connold, Plant Galls, p. 244. Walker, 1871, p. 451. 

 Houard, No. 282. 

 Nematoda Minute oval or elongated pustules, i to 2 mm. long, on 

 the under surface of the leaf. Green or bluish-black. 



Tylenchus graminis Hardy 61 

 Hardy, 1850, p. 182. Houard, No. 283. 



Brachypodium sylvaticum Roem. and Schult. [gracik. 

 Beauv.). ill. Slender False Brome Grass. 

 Diptera Top-shaped swelling on the stem in the vicinity of a 

 node, causing a slight swelling outside the sheath. 

 Chestnut-brown, becoming blackish. 



Ckcidomyla sp. 62 

 C. Zimmerman, (907. Houard, No. 297. 



Agropyron repens Beauv. 112. Couch Grass. 

 Hymen- SpincUe-shaped swelling on the stem. 

 optora AuLACiDEA hieracii Bouch^ 63 



Syn. Aulax hieracii Sch. 

 Connold, Plant Galls, p. 114. 

 Diptera Terminal internodes remaining short and thickened, 

 , within a cigar-shaped sheath formed by imbricated leaves. 

 The cavity is elongated, and contains a yellowish-white 

 larva. M. G. 



Chlorops taeniopus Meigen 64 

 Connold, Plant Galls, fig. 93. 



