REPORT OF THE STATE ENTOMOLOGIST I907 37 1 



cc Abdomen dark brown ; 5th antennal segment with a length y2 

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

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



willow ; female a m c 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 14 greater than its diameter; the ovipositor ^4 the 

 length of the abdomen, the lobe with a length y^ 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 2j4 times its diameter ; the ovipositor Ys the length of 



the abdomen, the lobes with a length only 54 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 antennal segments, the 5th with a 



length 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 c e 1 1 i p hy Hi a n. sp., C. 913, 918 



bb Antennal segments with a distinct stem 



c Sth antennal segment with a stem yi 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 sth antenna! segment with a length 34 the basal enlargement 



d 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 I 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 Kicff. 



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

 rated from OHgotrophus Latr. by the quadriarticulate palps and 

 may be distinguished from Mayetiola Kieff. by the third vein 

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



Key to species 

 o 12 antennal segments 



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

 (OHgotrophus) tiliacea Felt, C. 83 



