234 NE W YORK STATE MUSEUM 



This genus, first recognized in America by the author, comprises 

 an assemblage of extremely interesting forms which may be dis- 

 tinguished at once by the great prolongation of the mouth-parts 

 and the 10 to 12 antennal segments. The European C. ch'ry- 

 santhemi H. Lw., the type of the genus, has 13 antennal segments 

 in both sexes. The wings are small, rather narrow and with 

 the venation greatly reduced -(pi. 6, fig. 8) ; claws unidentate. 

 The species are all small, being only about 1 mm in length. It is 

 very probable, as stated elsewhere, that this genus is a synonym of 

 Acorhynchus Rond. The four European species were all reared 

 from the enlarged akenes of such composites as Anthemus, 

 Chrysanthemum, Achillea and Tanacetum. The additional Ameri- 

 can species, C. eupatoriflorae, was reared from the florets 

 of thoroughwort, Eupatoriumperfoliatum. It is prob- 

 able that the other species known to occur in this country have 

 similar habits, though C. karnerensis was taken on willow. 



Key to species 



a Second to fifth abdominal segments reddish brown; female with 10 antennal 



segments, the fifth with a length one-third greater than its diameter 



f i 1 i c i s Felt, C. 386 

 aa Abdomen unicolorous 



b Abdomen of the female dark brown, that of the male fuscous yellowish, 

 antennal segments 10, the fifth in the male with a length twice its 

 diameter, that of the female with a length one-fourth greater than its 

 diameter, the three- distal palpal segments successively longer, the 



fourth one-fourth longer than the third. Reared from yarrow 



m i 1 1 e f o 1 i i Wachtl., C. 1236 



bb Abdomen of female dark brown, antennal segments 10, the fifth with a 



length one-half greater than its diameter, the three distal palpal 



segments equal karnerensis Felt, C. 488 



bbb Abdomen reddish, antennal segments of male 12, female 11, the fifth of 

 the male with a length one-half greater than its diameter, that of the 

 female with a length one-fourth greater. Reared from flowers of 



thoroughwort, Eupatorium perfoliatum 



eupatoriflorae Felt, C. ai689 



Clinorhyncha filicis Felt 



1907 Felt, E. P. N. Y. State Mus. Bui. no, p. 108; separate, p. 12 



1908 N. Y. State Mus. Bui. 124, p. 333 



This species was taken on fern at Nassau, N. Y., June 24, 1906. 

 Apparently the same form was reared from willow bearing the 

 galls of Hormomyia verruca Walsh, collected by Cora H. 

 Clarke at Magnolia, Mass. 



