33 
a. 
aa. 
CLASSIFICATION. 
* 
Although since the days of Reaumer and Bonnet (1737—1779) the 
Aphides have, by their singular method of reproduction, attracted the 
ittention of entomologists, yet it was but very recently that any at- 
empt worth naming was made to classify and systematically arrange 
he species of the family. 
Serville and Amyot in the “Tableau Methodique ” prefixed to their 
'‘Histoire Haturelle das Insedes Ilemipteres ” (ls43), arrange the Jlom- 
tptera in two sections corresponding with the two sections defined in 
he introduction. The second of these sections, which they name 
Sternorhynchi , is subdivided by them as follows: 
Beak distinct in both sexes ; wings when present four. 
A. Wings transparent .or but slightly clouded. 
Saltatorial; antennae divided at the tip into two bristles. 
Fdm. Ps v L LID a e . 
Antennae as long as the body; head inclined and flat below. 
Gen. Psylla. 
Antennae not much longer than the prothorax; head square, 
flat and grooved above. Gen. Lima. 
Not saltatorial; antennae not furnished with two bristles at 
tip. Fam. Aphid id ae 
b. Abdomen with honey-tubes. Gen. Aphis, 
bb. Abdomen without honey-tubes. Gen. Myzoxylus. 
A A. Wings opaque and mealy. Fam. Aleukodidae. 
Beak wanting in the male; female apterous; male winged, but 
having only two wings. Fam.. Cocci dae. 
Kal ten bach in 1843, (Honor/r a phi a der Familien der Pfianzenlause) 
rranged the family into two principal sections; first , those having 
.wen joints in their antennae and posessing wings; second , those 
dth less than seven joints in the antennae and which he considered 
s permanently apterous. The first of these sections he subdivided 
ito eight genera taking the veining of the wings as his chief guide; 
ie second he divided into four genera. Another arrangement of the 
ame author was based upon the supposed method of ^reproduction 
■ s follows : 
1. The vim-oviparous —Containing the genera Aphis and Lachnus. 
2. The exclusively oviparous —Containing the genera Chernies Va¬ 
nia and Phylloxera. 
The exclusixely viviparous— Containing the genera Tetraneura, 
J ernphiyus, Schizoneura and probably For da and Trama. 
But the facts ascertained since* the publication of his work show, 
lat the author was mistaken in reference to the method of repro- 
uction of several of the genera named under the second and third 
3 
E.:« 
!i5« 
8 * 
