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NEW YORK STATE MUSEUM 



tapered to an acute point and are three fourths as long as the width 



of the pupa. 



Larva. The fuU grown larva is about 1.5 mm long, pale yellow- 

 ish, with the segmentation distinctly marked. Head 

 rather prominent, narrow, tapering anteriorly, an- 

 tennae consistmg of a very broad, retracted basal 

 segment and a rather large, spindle-shaped, terminal 

 segment. Chitinous fork or '* breastbone " Y-shaped, 

 the anterior arms broad, well separated, each slightly 

 emarginate anteriorly, distal extremity somewhat en- 

 larged. Antepenultimate abdominal segment with a 

 pair of sublateral, chitinous, dark brown tubercles 

 ventrally, while on the dorsum there appears to be a 

 median, subcorneal, slightly curved, chitinous tubercle, 

 the last segment with two pairs of sublateral minor 

 protuberances. 



Chokecherry gall fly(Cecidomyia Virgin- 

 ia n i a e n. sp.). The peculiar enlarged, galled fruit 



^fcoSia^yfaTval of the chokcchcrry, Prunus virginianus, has 



enlarged"^* (Origi- bccH known for somc time and was noticed by the 

 late Dr Lintner in his 12th report for 1896, p. 313. 



He there states that cherries apparently galled by this insect have 



been very abundant in Keene Valley, and adds that Prof. George 



F. Atkinson of Cornell University named 



and described a fungus, Exoascus 



cecidomophilus, which was usually 



associated with these insects. Repeated 



though unsuccessful efforts have been made 



to obtain the adult, and, lacking this, we '^ ^ 



have deemed it advisable to describe and ' :. 



illustrate the larva under the above name. : % 



Larva. The full grown larva is 2.5 mm 



long, yellowish or yellowish red in color and 



rather stout. Head rather prominent, nar- 

 row, tapering very slightly anteriorly and 



with short, rather conspicuous two seg- 



-mented antennae. The first joint of the 



latter is very short, about twice as broad 



as long, the second subconical and twice as 



long as broad. Chitinous fork or "breast- 

 bone " rather long, slender, basal portion 



simple, of uniform size ; anterior part greatly 



dilated and with two short, distinct cephalic 



teeth or dentitions. Body segments each 



with a pair of submedian ventral and lateral 



setae; dorsum apparently simple. Spiracles on the second thoracic 



and the abdominal segments evident, those on the eighth being sub- 







Fig. 44 Cecidorayia vir- 

 ginianiae, larval breast- 

 bone, much enlarged (Origi- 

 nal) 



