SYNOPTICAL KEY TO THE APHIDADAE OF MINNESOTA IIl7 
cornicles very short, situated on hairy, cone-shaped tubercles; cauda 
short and broad, hardly extending beyond the anal plate. Large, 
spiderlike, dark colored forms living in large colonies on woody parts 
of trees, or underground on roots or in nests of ants. 
a. The three or four tribes of the series are further considered as a super- 
tiibelwithethessameyucharacters, aS. thepsemes (44-149 eae cori risicekie ale: 
3 Supertribe LACHNEA 5 
5. Supertribe LACHNEA. The distinguishing characters are the 
same as those already given for the series. Two groups of tribes are 
recognized : 
a. Stigma of fore wings long and narrow, transverse or blunt at distal end; 
radial sector arising from the lower distal angle of the stigma and run- 
ning as a straight vein to the margin of the wing. Found exclusively 
CIM COtihenarvrs soya Nona eset oie Sala nies Group LACHNINA § 6 
b. Stigma long and narrow, or short and broad, the distal end truncate or 
ending as a point in the margin of the wing; radial sector arising from 
the middle of the stigma, or at least some distance back of the end, and 
more or less curved. Found on woody parts of deciduous trees and 
MOO CV Dlctitis e Oia a Oml GOOLSIar ay ciocicieieis cisielteld-ieleuee Group TRAMINA 13 
6. Group LACHNINA.~ Usually very large forms and in the 
aptera spiderlike in appearance and in movements; black or brown 
and hairy; rostrum with five distinct segments; media is faint, in- 
distinct vein in comparison with the other veins, and is usually twice 
branched. Two tribes are recognized in this group: 
a. Large forms with wide and globete abdomen and long legs. Found on 
PUMkeanadeiimps Ob WCOMtehas sess sieiele vere cere cieasi cele Tribe LACHNINI 
b. Medium to small forms with narrow, elongated abdomen; found on the 
needles of pines and usually with some green colors.................. 
Tribe EULACHNINI to 
7. Tribe LACHNINI. Large, hairy, black or brown, often with 
metallic reflections; legs long, especially the hind pair; found ex- 
clusively on woody parts of conifers. Two genera are recognized: 
NI 
a. The media of the fore wings twice branched.......... Genus LACHNUS 8 
b. The media of the fore wings with only one branch..................-- 
Genus SCHIZOLACHNUS- g 
8. Genus LACHNUS (llliger) Burmeister, 1835. Type: Aphis 
pini Linnaeus, 1758. Antennae about half the body in length; usually 
6-jointed, and terminal segment with a very short spur (unguis). 
Size large, body and appendages provided with numerous, long, 
spreading hairs; rostrum distinctly 5-jointed. Wings long and _ nar- 
row ; stigma long and narrow with distal end blunt or truncate; radial 
sector arising from the lower distal angle of the stigma and running 
