REPORT OF THE STATE ENTOMOLOGIST I917 I4I 



Halteres yellowish basally, reddish brown apically. Coxae and 

 femora basally, pale yellowish; femora distally, tibiae and tarsi a 

 variable fuscous straw; claws long, slender, strongly curved, the 

 pulvilli nearly as long as the claws. Type Cecid. ai722. 



b re mia Rond. 

 i860 Rondani, C. Soc. Sci. Nat. Milano Atti, 2:4 



1895 Riibsaamen, E. H. Ent. Nachr., 21 : 186 



1896 Kieffer, J. J. Wien. Ent. Zeit., 15:92, 95 



1897 Syn. Cecid. de Eur. & Alg., p. 27 



1900 Soc. Ent. Fr. Ann., 69:447 



1904 Soc. Sci. Brux. Ann., 28: 19-22 



1908 Felt, E. P. N. Y. State Mus. Bui. 124, p. 394 



1910 Riibsaimen, E. H. Zeitsch. Wissenschaft. Insektenbiol., 15:288 



191 1 Felt, E. P. N. Y. Ent. Soc. Jour., 19:53 



191 2 Kieffer, J. J. Ent. Soc. Fr. Bui. 6, p. 137-38 

 19 13 Gen. Insect., fasc. 152, p. 165 



This genus was erected with C. decorata Winn, as the 

 type, it being distinguished from all other known Diplosids by the 

 greatly produced hairs on one side of the antennae. C. a p h i d i - 

 m y z a Rond., a zoophagous species, was also noticed and assumed 

 to belong to the same genus. Later Kieffer showed there were 

 marked structural differences between the two forms and that these 

 morphological variations were accompanied by a divergence in 

 habits. 



This genus, like Aphidoletes, has the antennal setae and circumfili 

 greatly prolonged on the dorsal face of the segments. The male 

 may be distinguished from all other Cecidomyiidae known to us 

 by the low rudimentary circumfilum occurring on the base of the 

 distal enlargement of the flagellate antennal segments (figure 48). 

 The pulvilli are very short or rudimentary, the anterior claws only 

 being unidentate. The wing is illustrated on plate 8, figure 7. 

 The ventral plate in the male tapers distally, presenting a very 

 different appearance from that obtaining in Aphidoletes. Members 

 of this genus are said by Kieffer to be xylophagous. Recent changes 

 in generic grouping do not appear to be justified by American forms 

 and have therefore not been followed. 



Key to Species 



a Distal enlargement of the fifth antennal segment of the male produced, with 

 length one-half greater than its diameter, the terminal clasp segment 

 distinctly enlarged subapically 

 b Abdomen dark yellowish brown, length 1.3 mm; stems of the fifth antennal 

 segment in the male one and one-half and three and one-half times their 

 diameters, respectively : borealis Felt, C. 1497 



