GENERIC CLASSIFICATION OF APHIDIDAE. 59 
Characters. — Head with prominent antennal tubercles which project inward and are 
armed with prominent spines. Antennae of six segments armed with subcircular 
sensoria and in the first segment with spines similar to those of the antennal tubercles'. 
Wing venation normal. Cornicles narrow and cylindrical at the base, then abruptly 
and prominently swollen, returning again abruptly to the normal size near the tip. 
Cauda rather short and conical. 
Type, AmpJiorophora latysiphon Davidson. 
Subtribe PENTALONINA. 
The subtribe Pentalonina is one of the Aphidini in which 
specialization in the wing venation has taken place in a peculiar 
manner. The radial sector has in one genus extended downward 
and coalesced with the upper branch of the media. In the genus 
Idiopterus the two have not become entirely fused, though in some 
specimens they have almost done so. In Pentalonia, however, the 
veins have become permanently united, and a very peculiar-looking 
venation is the result. A closed cell is formed by the radial sector 
when it meets the upper branch of the media, and when it leaves 
this again it gives a three-branched appearance to the upper branch 
of the media. The explanation of this peculiar venation is, however, 
easily understood by comparison with the venation of Idiopterus. 
In some of the genera the hind wings are greatly reduced, so that some- 
times only one vein remains, while in other genera this reduction has 
not taken place. Most of the wing veins are clouded with brownish 
borders. 
The insects feed usually upon ferns or tropical plants. 
Key to the Genera of the Pentalonina. 
1. Hind wings much reduced in size, lacking at least the cubitus 2. 
Hind wings nearly normal in size and with both media and cubitus present . 3. 
2. Radial sector of fore wing fused with the upper branch of the media, forming 
a closed cell. Pentalonia. 
Radial sector of fore wings not so fused, but normal Microparsus. 
3. Cornicles cylindrical Idiopterus. 
Cornicles somewhat swollen near their distal extremities 4. 
4. Media of fore wings twice branched Fullawayella. 
Media of fore wings once branched jNTeotoxoptera. 
Genus FULLAWAYELLA Del Guercio. 
1911. Fullawayella Del Guercio, Redia, v. 7, p. 462. 
1916. Jlicromyzus, Van der Goot, Zur Kenntniss der Blattlaiise Java's, p. 55. 
This genus is very suggestive of Amphorophora in certain ways 
but no doubt is related here. Van der Goot's genus was erected 
with nigrum V. d. Goot as type but this species differs very little 
from Mrkaldyi. 
Characters. — Antennse on prominent, converging, imbricated antennal tubercles, of 
six segments and armed with subcircular sensoria. Fore wings with the media twice 
branched and with the radical sector deeply curved toward the upper branch of the 
