REPORT OF THE STATE ENTOMOLOGIST I907 339 



Ulmus (elm) 

 pud gall D a s y n e u r a u 1 m e a , C. 880 



Vaccinium (cranberry) 

 Leaf fold gall Dasyneura vaccinii Smith, C. 957 



Vitis (grape) 



Tumid leaf gall Dasyneura vitis, ai 165b 



Tumid leaf gall Arnoldia vitis, ai 165a 



Wood, decaying 

 Fungus filled Dasyneura flavotibialis, 31454 



Yucca 



Dasyneura y u c c a e , C. 1053 



Key to genera 



a Palpi biarticulate Diarthronomyia n. g. 



aa Palpi quadriarticulate 



b Antennae with 12 segments Arnoldia Kieff. 



bb Antennae usually with more than 12 segments 



c 3d vein uniting with costa distinctly before the wing apex, straight or 



curved anteriorly and tapering but little distally Dasyneura Rond. 



cc 3d vein uniting with costa very near or at the wing apex, straight and 

 usually tapering distally Rhabdophaga Westw. 



DIARTHRONOMYIA n. g. 



This genus presents a general resemblance to Rhopalomyia 

 and like it has biarticulate palps and a great similarity in the 

 structure of the male genitalia. The minutely unidentate claws 

 associate it with Rhabdophaga and its allies. The wing is illus- 

 trated on plate 34, figure 9. 



Type D. artemisiae 



Diarthronomyia artemisiae n. sp. 



Male. Length 2 mm. Antennae nearly as long as the body, 

 rather thickly haired, yellowish brown, 18 segments ; mesonotum 

 dark reddish brown, the submedian hues sparsely haired ; scutel- 

 lum reddish brown, postscutellum darker; abdomen sparsely 

 haired, reddish brown; halteres yellowish transparent; legs a 

 variable light straw, lighter distally. 



Female. Length 3 mm. Antennae extending to the 3d abdom- 

 inal segment, sparsely haired, pale yellowish, probably composed 

 of 18 segments; color characters about as in the opposite sex. 



