REPORT OF THE STATE ENTOMOLOGIST IQO/ 3/1 



cc Abdomen dark brown ; 5th antennal segment with a length ^ 

 greater than its diameter; ovipositor ^ the length of the abdo- 

 men, the lobe with a length 3 times its width ; bred from 



willow ; female a m e r i c a n a n. sp., C. 920 



aaa 20 or more antennal segments 

 b Antennal segments sessile 



c Abdomen reddish ; 24 to 26 antennal segments, the 5th with a 

 length j4 greater than its diameter ; the ovipositor 3^ the 

 length of the abdomen, the lobe with a length ^ greater than 



its width ; bred from apical beak gall on willow ; female 



(Cecidomyia, Rhabdophaga) rigidae 



O. S., C. a687 



cc Abdomen light brown; 26 antennal segments, the 5th with a 



length 2^ times its diameter ; the ovipositor ^ the length of 



the abdomen, the lobes" with a length only ^ the width; bred 



from a small clustered rosette willow gall ; female 



"" w a 1 s h i i n. sp., C. 774, ?924, ai8i3 



ccc Abdomen reddish brown ; 24 anten'nal segments, the 5th with a 



length 2^/2 times its diameter; the ovipositor as long as the 



body, the lobe with a length 4 times its width ; bred from 



Celtis leaves ; female ..celtiphyllia n. sp., C. 913, 918 



bb Antennal segments with a distinct stem 



c 5th antennal segment with a stem ^ the length of the basal 

 enlargement 

 d Abdomen reddish brown ; 24 antennal segments ; bred from 



a beak gall on willow ; male 



(Cecidomyia) rigidae O. S., C. a687 

 cc 5th antennal segment with a length ^ the basal enlargement 



J Abdomen dark brown; 20 antennal segments; bred from 



Salix stems ; male 



(Cecidomyia) perocculta Ckll., C. 1251 

 dd Abdomen pale yellowish ; 25 to 26 antennal segments ; bred 



from a small clustered rosette willow gall; male 



w a 1 s h i i n. sp., C. 774 



ccc 5th antennal segment with a stem as long as the basal enlargement 



d Abdomen reddish brown; 22 to 23 antennal segments; bred 



from Celtis leaves ; male 



celtiphyllia n. sp., C. 913, 918 



JANETIELLA Kieff. 



This genus comprises a number of forms which may be sepa- 

 rated from Oligotrophus Latr. by the quadriarticulate palps and 

 may be distinguished from Mayetiola Kieif. by the third vein 

 uniting with costa well before the apex of the wing [pi. 36, fig. 4]. 



Key to species 



a 12 antennal segments 



b Abdomen light brown, the dorsal plate triangularly emarginate ; male 



(Oligotrophus) tiliacea Felt, C. 83 



