VOL. V.—BROOKLYN, OCT. & NOV., 1889.—NOS. 10 & 11. 
A GENERIC SYNOPSIS OF THE APHIDID-. 
By Wm. H. AsSHMEAD. 
Famity VIII. APHIDID. 
All soft bodied insects. Head small, longer than wide, and seldom 
as wide as the thorax; the frons most frequently triangular, flattened, 
slightly concave or slightly convex, never much produced. Eyes prom- 
inent, hemispherical, facetted, with a slight tubercle posteriorly, and 
situated on the sides of the head, entirely absent only in a few subter- 
ranean species. Ocelli 3, small, sometimes indistinct or wanting, 2 
situated close to the eye and one on the vertex. Beak 3-jointed, arising 
at the hinder inferior part of the head, enclosing 3 to 4 fine setae, when 
at rest usually pressed close to the sternum in a more or less distinct 
groove between the cox. Antenne filiform, 3- to 7 jointed, of variable 
length, sometimes longer than the body. Thorax usually weil developed 
and lobed. Scutellum not large transverse or triangular. Wings when 
present four, membranous, not strongly veined—a custal, subcostal, dis- 
coidal and stigmal veins. Tegulz present but very small. Coxe short, 
conical, gradually increasing in size posteriorly, not contiguous. Femora 
seldom very thick. Tibiz usually long, slender, cylindrical. Tarsi 
short, 2-jointed, except in Oestlund’ss new genus J/as/opoda, in which 
they are atrophied, and one-jointed in two or three subterranean genera ; 
the latter, however, are probably nothing but nymphs. Pulvilli usually 
present. Abdomen oval, elongate oval or ovoid, the sixth segment 
dorsally often with distinct honey-tubes or nectaries ; in some forms 
these are subobsolete or tuberculate, or visible only as oval openings, in 
others they are entirely wanting ; they secrete a sweet substance called 
“honey-dew” of which ants are particularly fond. 
At the tip of the abdomen is usually found a more or less distinct 
appendage, seldom entirely wanting, called the cauda or style. 
ENTOMOLOGICA AMERICANA, VOL, V. 1 OcToBER & NOVEMBER, 1889. 
