14 BULLETIN 826, U. S. DEPARTMENT OF AGRICULTURE. 



Genus NIPPOLACHNUS Matsumura. 

 Plate I, G, H, J, K. 

 1917. Nippolachnus Matsumura, Journ. Coll. Agr. Tohoku Univ., v. 7, pt. 6, p. 382. 



This genus is closely, related to Anoecia Koch and yet it retains 

 many Lachnus characters which are not present in Anoecia. It is 

 separated from that genus by several important points. The head 

 is distinctly divided as it is not in Anoecia. The stigma is long and 

 Lachnus-like and the eyes have not the small prominent ocular 

 tubercles of Anoecia, but are rounded on their posterior margins. 



Characters. — Antennas of six segments, armed with prominent protruding sensoria 

 and many hairs; head divided; eyes without prominent ocular tubercles. Wings 

 with the media once branched, the stigma rather long and narrow. Cornicles on large 

 broad cones entirely covered with hairs. 



Spring forms free, migrating in summer to alternate hosts. Sexes small, males 



winged. 



Type (fixed by Matsumura, 1917), Nippolachnus piri Mats. 



Sub tribe EULACHNINA. 



The subtribe Eulachnina is related to the Lachnina quite closely, 

 as can be seen by the wing structure where the radial sector is a 

 straight, short vein extending across the tip of the wing. The 

 media also is faintly indicated. In the other branch of the tribe in 

 which the Anoecina and Tramina are found, the radial sector is 

 curved as it is in Aphidina, etc. Members of the Eulachnina may, 

 however, be separated at once from the Lachnina on the elongate, 

 narrow shape of the body, the abruptly rounded cauda, the character 

 of the cornicles, and the absence of ocular tubercles upon the eyes.' 

 The subtribe is evidently quite specialized as compared to the Lach- 

 nina. 



Characters. — Eyes large and set off from the head; ocular tubercles not evident; 

 antennas slender, armed with bristles or spines, not slender hairs. Cornicles shallow, 

 not on distinct hairy cones. Cauda abruptly rounded. Body very elongate and 

 slender, scarcely wider than the head. 



Key to the Genera of the Eulachxixa. 



1. Antennas of five segments, armed with minute bristles Essigella. 



Antennas of six segments 2. 



2. Media once branched, antennas with long stout spines Eulachnus. 



Media twice branched Todolachnus. 



Genus ESSIGELLA Del Guercio. 



Plate I, S-Y. 

 1909. Essigella Del Guercio, Rivista Patol. Vegetale, n. s., v. 3, p. 329. 



The genus Essigella is quite similar to Eulachnus with the excep- 

 tion of the antenna?. 



Characters. — Head with large outstanding eyes, very much broader than long. 

 Antennas of five segments, imbricated, armed only with a few minute bristles. Fore 

 wings with the media faintly indicated, once branched, hind wings with both media 

 and cubitus present. Cornicles chitinized rings situated close to the body, no hairy 

 cones present. Cauda rounded. Body elongate and narrow. 



Type (monotypical), Lachnus cali/ornicus Essig 



