NO. 2281. A REVISION OF CH ALGID-FLIES— PHILLIPS AND EMERY. 469 



Plate 41. 

 Fig. l=ovipo.sitor of H. elyiiwphila. 

 2=ovipositor of H. ayropyrocola. 

 3=ovipositor of JBf. vaginicola. 

 4=ovipositor of //. tritici. 

 S^ovipositor of H. Iiordei. 

 6=ovipostor of //. giUetti. 

 7=ovipositor of //. sccalis. 

 8=ovipositor of //. occidenialis. 

 9=ovipositor of H. poophila. 

 10=ovipositor of H. festvcac. 



All illustrations in phitcs 39, 40, and 41 are drawn to the same scale and 



greatly enlarged. 



Plate 42. 



Fir. 1 = 2/. tritici; illustrating the sculpturing of the praescutuun of the 



gall-forming species. 

 Fig. 2 = J/, maculata ; illustrating the sculpturing of the praescutuni of 

 the species that occupy the center of the stem in various plants. 

 Illustrations greatly enlarged. 



Plate 43. 

 Fin. l=propodium of the female of //. agroftiidis. 

 2=propodium of the female of H. wcbsteri. 

 3=propodium of the fc-inale of H. albomaculata. 

 4=propodium of the female of H. albomacvlata. 

 5=propodium of the female of H. captiva. 

 6=propodium of the female of H. poac. 

 7=propodium of the female of H. dactylicola. 

 8=pvopodium of the female of //. elymi. 

 9=propodium of the female of H. bromicola. 

 10=propodium of the female of II. maculata. 

 ll=propodium of the female of H. agropyrophila. 

 12=propodium of the female of H. secalis. 

 13=proportium of the female of H. vaginicola. 

 14=propodium of the female of //. festucae.. 

 15=propodiuin of the female of //. atlantica. 

 Plate 44. 

 Fig. l=propodium of the female of H. tritici. 

 2=propodium of the female of H. ruflpes. 

 3=propodium of the female of //. elyinivora. 

 4=propodium of the female of H. elymophila. 

 5=propodium of the female of H. hesperus. 

 O=propodium of the female of H. hordei. 

 7=propodium of the female of U. ovata. 

 8=propodium of the female of H, occidentalis. 

 9=propodium of the female of H. ayropyrocola. 

 10=propodium of the female of //. clymicola. 

 ll=propodium of the female of H. gilletti. 

 12=propodium of the female of //. elyinoxena. 

 13=propodium of the female of H. poophila. 

 14=proi)odium of the female of H. elymophtJiora. 



All illuslrnlions in plates 43 and 44 are drawn to the same .scale and greatly 

 enlarged. 



