RICPORT OF THE STATE ENTOMOLOGIST \C)\'/ 



149 



Youngomyia umbellicola O. S. 



1871 Osten Sacken, R. Amer. Ent. Soc. Trans., 3:52 (.uall and larva 

 described, CV'cidoniyia) 



1876 Bergenstamm, J. E. & Low, Paul. \'erli. k. k. zool.-bol. (usell. Wu^n., 

 26:91 (Ceci<lomyia) 



1892 Beutenmueller, William. Amor. Mus. of Nat. Hist. Bnl., 4-^(^9 

 (Cecidomyia) 



igo7 Amcr. Mus. of Nat. Hist. BuL, 23:393 (Cecidomyia) 



1910 Stebbins, F. A. Sprin;/f. Mns. of Nat. Hist. BuL, 2:48 (Cecidomyia) 



The gall is a common, widely distributed deformity. It occurs 

 generally in New York State and has been observed in other eastern 

 states and recorded from both Illinois and Missouri. Adults were 

 reared April 13, 1887 from blossoms of elder, Sambucus. taken at 

 Cadet, Mo., April 9. The material was kindly loaned for study 

 through the courtesy of the United States National Museum. 



Fig. 52 Youngomyia umbelli- 

 cola, fifth antennal segment of female 

 (enlarged, original) 



Fig. 53 Youngomyia um- 

 bellicola, terminal antennal 

 segment of female. This is densely 

 haired, only a few setae being 

 shown (enlarged, original) 



Gall. Diameter 4 to 6 mm, globose and conspicuous because 

 of the larger size in comparison with the normal, smaller flowers 

 (Plate 5, fig. 2). The gall contains one or more orange-yellow larvae. 



Larva. Length 2.5 mm, pale yellowish orange, the head moderately 

 long, bread, the antennae long, slender, the segmentation distinct; 

 breastbone bidentate, distinctly chitinized, the shaft slender, some- 

 what irregular and with an expansion posteriorly; skin coarsely 

 shagreened, the subtruncate posterior extremity with a submedian 

 pair of well-developed, upcurved, chitinous spines resting upon a 

 rather well-defined, chitinous plate. These spines are moved by 



