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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 full grown larva is about 1.5 mm long, pale yellow- 

 ish, with the segmentation distinctly marked. Head 

 rather prominent, narrow, tapering anteriorly, an- 

 tennae consisting 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, subconical, slightly curved, chitinous tubercle, 

 the last segment with two pairs of sublateral minor 

 protuberances. 



Chokecherry gall fly(Cecidomyia virgin- 

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

 ^fcomia^yfaTvali of the chokccherry, Prunus virgin ianus, has 

 eSed"^' (Orig?- been known for some 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 

 c e c i d o m o p h i 1 u s, 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 seeb'hd thoracic 

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



Fig. 44 Cecidomyia vir- 

 gin i a niae, lar\al breast- 

 bone, much enlarged (Origi- 

 oal) ... • 



