LeprporpTERA — Drprrmra 1129 
Injury — Larva ties together a cluster of leaves and feeds within. 
Distribution — Europe. 
. References — Kaltenbach, J. H. Pflanzenfeinde, p. 210. 1872. 
Spuler, A. Schmetterlinge Europas, 2:358. 1910. 
DIPTERA 
angled IRGIki, [PICZO TOIT sea ite nee ee a ang a ae eee ie ee Fam. Cecidomyiidae 
Hosts — Crataegus, Populus, Prunus virginiana. 
Injury — Larva found in leaf gall. 
Distribution — North America. 
Reference — Felt, E. P. New York State Mus. Bul. 200:138. 1918. 
\ nlialoom 18, LOR, COMMMGstas ene Cn nb eee SA OAS EAB Oen On bone en aoe abe Fam. Cecidomytidae 
Host — Crataegus oxyacantha. 
Injury — Solitary larva feeds in blossom bud, causing it to remain closed and swollen. 
Distribution — Europe. 
References — Ross, H. Die Pflanzengallen Mittel- und Nordeurcpas, p. 132. 1911. 
ere R.S8., and Harrison, J. W. H. Ent. Soc. London. Trans. 1917:391. 
1917. 
bedeguar Walsh, Cecidomyia (Tufted thorn gall)........... a Phe Fam. Cecidomyiidae 
Host — Crataegus. 
Injury — Larvae deform leaves with filamentous subglobular vein galls, 1 cm. long, 
generally found on the midveins. 
Distribution — North America. 
References — Walsh, B. D. Can. ent. 1:79. 1869. ; 
Felt, E. P. New York State Mus. Bul. 200:138. 1918. 
Beas folvombelimmVncodeplosiss. .ane.. see src re ee eee Fam. Cecidomytidae 
Hosts — Prunus virginiana, Crataegus. 
Injury — Larvae live in galls on hawthorn fruit caused by Gymnosporangium clavipes, 
and feed on the rust spores. A 
Distribution — North America. 
References — Felt, E. P. New York State Mus. Bul. 200:152. 1918. 
Wellhouse, W. H. Ent. news 30:144. 1919. 
BRCLLTIUA CLO MV VATE ORT SUD Ne co) eects ce Uaesealteseyfaue aie whivboay etek ne Meal ie ale taeue Fam. Cecidomyiidae 
Host — Crataegus oxyacantha. 
Injury — Larva lives in leaf gall. 
Distribution — Germany. 
References — Kaltenbach, J. H. Pflanzenfeinde, p. 212. 1872. 
Kieffer, J. J. Genera insectorum, fase. 152, p. 75. 1913. 
DUE LC DMV SIINTIOOMP BOTT UST hee esas c hs na acho eusien ce) ovninlecla sydious Saperethotoe ok Fam. Cecidomyiidae 
Host — Crataegus oxyacantha. 
Injury — Colonies of larvae cause rosettes of deformed sessile leaves, which make trees 
and hedges unsightly. 
Distribution — Europe. 
References — Kaltenbach, J. H. Pflanzenfeinde, p. 212. 1872. 
Connold, E. T. British vegetable galls, p. 190. 1902. 
erataegifolia Felt, Hormomyia (Thorn cockscomb gall)................. Fam. Cecidomyiidae 
Host — Crataegus. 
Injury — Larva deforms leaf with a green or red gall 1 cm. long, shaped like a cockscomb. 
Distribution — United States. 
References — Felt, EK. P. Journ. econ. ent. 1:20. 1908. 
Felt, E. P. New York State Mus. Bul. 200:136. 1918. 
(Figs. 116 and 117, paze 10382.) 
