3^4 ' NEW YORK STATE MUSEUM 



Key to species 



a Abdomen dark brown 



b Abdomen rather thickly clothed dorsally with silvery white scales 

 c Antennae and nicsonotum dark brown; male with 16-17 antennal 



segments On Ilex; cinerea Felt, C. 7i 



cc Antennae light brown ; mesonotum thickly yellow scaled ; antennae, 



female, 22 segments ; bred from Solidago 



a r g e n t i s q u a m a e n. sp., C. ai568x 



bb Abdominal segments variably margined anteriorly and laterally with 



yellowish white scales ; antennae, female, 22 segments ; bred from 



tumid leaf or tendril gall v i t i s O. S., C. aii6s, aii46 



hbb Abdomen with the basal segment thickly clothed with silvery white 

 or yellowish scales 

 c 2d abdominal segment fuscous yellowish; antennae, female, 15 

 segments; ovipositor with hooks. . . .b a s i f 1 a v a n. sp., C. 719 

 cc 2d and following abdominal segments yellow 

 d 3d vein uniting with costa at the basal 3d 



e Female antennae with 18-19 segments ; ovipositor with 



hooks ; bred from blister gall on Cornus 



corni Felt, C. 764, aiisi, ai288 

 dd 3d vein uniting with costa at the basal half 



e Female with 23 antennal segments; no hooks present; bred 



from Rudbeckia r u d b e c k i a e n. sp., C. a 1697b 



ddd 3d vein uniting with costa at the distal 3d 



e Female with 21 antennal segments ; ovipositor with hooks ; 



bred from apical, clavate twig gall on Cornus 



(Cecidomyia) clavula Beutm. C. 3327 

 ccc 2d and following abdominal segments without conspicuous white 

 markings 



d 4th and 5th abdominal seginents darker than others ; mesono- 

 tum dark brown; male with 19 antennal segments; bred 



from Impatiens leaf gall 



impatientifolia Felt, C. aii66 

 dd Abdominal segments 2 to 6 unicolorous or nearly so; mes- 

 onotum reddish brown ; male 18, female 20-23 segments. 

 Bred from Vernonia flowers (? vernoniae Beutm.) 



vernoniflorae n. sp., C. 1058, 1059 

 cccc 2d and following abdominal segments with submedian silvery spots 

 d Subcosta uniting with costa at the basal 3d 



e Mesonotum reddish brown ; female with 28 antennal 



segments ; bred from oak twigs 



q u e r-c i p e r d a n. sp., C. 1054 

 ee Mesonotum dark brown' 



f Scutellum pale orange ; female with 18 antennal seg- 

 ments consobrina Felt, C. 183a 



ff Scutellum purplish brown ; female with 22 antennal 



segments nassauensis n. sp., C. 432 



dd Subcosta uniting with the anterior margin at the basal half 



