42 BULLETIN 82-6, U. S. DEPARTMENT OF AGRICULTURE. 



Del Guercio's genus had his trifolii placed as type. The corni- 

 cles of this species appear to be a little longer than those of the type 

 of Van der Goot's genus, but in other respects the insects seem to 

 be quite similar. We feel that they belong to the same genus. We 

 are keeping this genus distinct from Cryptosiphum, not only because 

 of the minute cornicles in that genus but also on account of the 

 peculiar head structure which is there seen. It is not typically Aphis- 

 like. 



Characters. — Head without prominent antennal tubercles. Antennae of six seg- 

 ments. Fore wings with the media twice branched; hind wings with both media 

 and cubitus present. Cornicles cylindrical, of moderate length; cauda reduced to a 

 broad, short, rounded structure. 



Type (fixed by Van der Goot, 1913), Aphis lychnidis L. 



Genus ANTJRAPHIS Del Guercio. 



Plate VI, C-F. 



1907. Anuraphis Del Guercio, Redia, v. 4, p. 190. 



1913. Brachycaudus Van der Goot, Tijd. voor Ent., v. 56, p. 97. 



1913. Dentatus Van der Goot, Tijd. voor Ent., v. 56, p. 93. 



1913. Semiapiiis Van der Goot, Tijd. voor Ent., v. 56, p. 105. 



1917. Yezabura Matsumura, Journ. Coll. Agr. Tohoku Univ., v. 7, pt. 6, p. 392. 



1918. Sappaphis Matsumura, Trans. Sapporo Nat. Hist. Soc, v. 7, pt. 1, p. 18. 



In 1907 Del Guercio erected the genus Anuraphis in which were 

 included pyri Koch, lappae Koch, iridis Del Guercio, ranunculi Kalt., 

 myosotidis Koch, c entaurede Koch, prunicola Kalt., tragopogonis Kalt., 

 iani Feer, farfarae Koch, and persicae Boyer. 



These species, with the exception of lappae and tragopogonis which 

 seem to belong to Aphis, have a broadly and somewhat abruptly 

 conical cauda quite unlike that of the genus Aphis. In 1913, Van der 

 Goot erected his genus Brachycaudus with one of these species, myoso- 

 tidis, as type without referring any of the species to Anuraphis at all. 

 It is evident that Brachycaudus is a synonym of Anuraphis. At the 

 same time he erected the genus Semiaphis with carotae Koch as type. 

 A stud} r of this species, as seen in Plate VI, makes it evident that this 

 is a species of the same general type. Semiaphis thus becomes a 

 synonym of Anuraphis. Based on the minute tubercles, particularly 

 on the head and caudal portion of the abdomen, Van der Goot also 

 erected the genus Dentatus with sorhi Kalt. as type. Apart from 

 these tubercles sorhi is in the character of the cauda, etc., a typical 

 Anuraphis. In our American rosy aphis, a species very similar to 

 sorhi, these tubercles are absent in many individuals, and in the fall 

 migrants the caudal ones are nearly always absent. If this character 

 were retained, therefore, the species would belong in one genus as 

 far as the spring migrant is concerned, and in another genus when 

 the fall migrant is considered. Dentatus, therefore, becomes also 

 a synonym of Anuraphis. 



