GENEEIC CLASSIFICATION OF APHIDIDAE. 15 
Genus EULACHNUS Del Guercio. 
Plate I, L-R. 
?1853. Cinaria Curtis, British Entomology, v. 12, section 576. 
1909. Eulachnus Del Guercio, Rivista Patol. Vegetale, n. s., v. 3, p. 329. 
1915. Protolachnus Theobald, Bull. Ent. Res., v. 6, p. 145. 
Del Guercio erected the genus Eulachnus without setting a type, 
but Wilson * has indicated agilis Kalt. as the type. Apparently, 
therefore, the genus must be based upon that species. Theobald's 
genus was based on his tuberculostemmata, a species in which the char- 
acters are the same. Cinaria was erected with pini L. as type, 'but 
this was questioned. 
Characters. — Head divided, eyes rather large and outstanding; antennas of six seg- 
ments, armed with long stout bristles. Fore wings with the media faintly indicated 
and once branched ; hind wings with both media and cubitus present but faint; cornicles 
minute rings, not situated on hairy cones. Cauda abruptly rounded. Body elongate 
and narrow. 
Type (fixed by Wilson, 1911), Lachnus agilis Kalt. 
Genus TODOLACHNUS Matsumura. 
1917. Todolachnus Matsumura, Jour. Coll. Agr. Tohoku Univ., v. 7, pt. 6, p. 381. 
The writer has been unable to study the type of this genus, but 
from the description given it seems to represent a genus belonging 
here and having a twice-branched media. The description of the 
cornicles as "wart-like, not broader at base" would indicate its 
affinities here, also the words "body long, nearly parallel on the lat- 
eral sides." 
Type (fixed by Matsumura, 1917), Todolachnus abietis Mats. 
Subtribe LACHNINA. 
The members of the subtribe Lachnina may be separated from 
those of other subtribes with the exception of the Eulachnina by 
the character of the venation. The radial sector here has almost 
reached the tip of the wing and become a short straight vein. The 
genera may be separated as follows: 
Key to the Genera of the Lachnina. 
1. Media of fore wings twice branched Dilachnus. 
Media not twice branched 2. 
2. Media once branched 3. 
Media simple Unilachnus. 
3. Labium lance-like Lachnus. 
Labium obtuse Schizolachnus. 
Genus LACHNUS Burmeister. 
1835. Lachnus Burmeister, Handbuch der Ent., v. 2, pt. 1, p. 91. 
1909. Lachniella Del Guercio, Redia, v. 5, p. 286. 
The genus Lachnus Burmeister was erected with the following 
included species: lapidarius ¥sib.,fagi Linn., quercus Lum.,fasciatus 
Burm., and punctatus Burm. 
Of these species the following were removed as types of other 
genera: fagi, 1857, PTiyllapMs, and quercus, 1870, StomapMs. 
1 Wilson, H. F. Notes on the synonymy of the genera included in the tribe Lachnini. In Ann. Ent. Soc. 
Amer. v. 4, p. 51-54, 1911. 
