232 
MODERN SYSTEM. 
Genus 304. LIVIA. Latr., Leach. Dieaphia. Illiger. 
Antenna shorter than the thorax, the base much thickened even to the 
middle: thorax with the anterior segment transverse, straight. 
Sp. 1. Liv.jmcorum. (PI. 5 .fig. 11.) magnified: the line beneath exhfi 
bits the natural size.) 
Livia Juncorum. Latr. 
Inhabits Junci. 
Fam. IV. Aphid*. Leach. 
Aphidii. Latreille. 
Tarsi two-jointed, the first joint very short : rostrum in both sexes ? 
antenna with six, seven, or eight joints : females generally apterous ; 
tarsi with the last joint vesiculous, 
Stirps 1. — Antenna eight-jointed: rostrum minute and horizontal with 
indistinct joints: head elongate-quadrate. 
Genus 305. TIIRIPS. Linn., Geoff., Latr., Lam., Oliv., Leach. 
Elytra and wings horizontal and linear. 
Sp. 1. Thr. Physapus. Black, hairy : antennas, tibiae, and tarsi pale : 
middle of the tibia; pale brown; elytra and wings white. (PI. 5, 
fig. 12. magnified : the. (ine beneath shows the natural size.) 
Inhabits the blossoms of various plants. 
Stirps 2.— Antenna seven-jointed : elytra larger than the wings : ros.- 
trum subperpendicular, with three very distinct joints : W trans- 
verse. 
Genus 306. APHIS. Linn., Fabr., Latr., Oliv., Dim., Leach. 
Antenna setaceous or filiform, seven-jointed: elytra larger than the 
wings; elongate triangulate: abdomen towards the apex generally 
tuberculated or horned: eyes entire. (PI. 5. fig. 9.) 
The animals of this genus are very numerous, and arc found on 
almost every plant. The French call them Pucerons, the English 
riant-lice. The species require examination; the plant on which 
they are found should be noticed, as it will afford specific names. 
The females are generally apterous, 
Genus 307. ERIOSOMA. Leach’s MSS. 
Abdomen without tubercles or horns : antenna: short and filiform : body 
tomentose. 
“ The Eriosomata form what are called improperly Galls on the stalks 
of trees near their joints, and knobs, which are in fact excrescences 
caused by the efforts of nature to repair the damage done to the old 
trees by the perforation of those insects, whose bodies are covered 
with down.’’ Leach's MSS. 
Sp. 1. Er. Mali. 
Aphis lanigera of authors. 
