814 



AN INTRODUCTION TO ENTOMOLOGY 



on the antennae (Fig. 1033). These filaments occur in series, and 

 there may be one, two or three of these series on each segment of the 

 flagellum. As each of these series has the appearance of a looped 



Fi?. 1032. — Wing of a s'all-enat. 



thread extending around the segment of the antenna they are termed 

 circumfili by Dr. Felt, who has described and figured many forms of 

 them in his series of papers on this family. 



Fig. 1033. — ^Antennal segments with circumfili: a, fifth segment of antenna of 

 Karschomyia viburni, male; b, fifth antennal segment of a Rhopaloniyia, 

 female; c, sixth antennal segment of Winnertzia calciequina, female. (From 

 Felt.) 



To this family belong the smallest of the midge-like flies. On 

 account of their minute size the adult flies are not apt to attract the 



