GENERIC CLASSIFICATION OF APHIDIDAE. 59 



Characters. — Head with prominent antennal tubercles which, project inward and are 

 armed with prominent spines. Antennee 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, Amphorophora latysiphon Davidson. 



Subtribe PENTALONXRA. 



The subtribe Pentaloniria 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 th'e 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. 



Kev 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 Fullaway ella. 



Media of fore wings once branched Neotoxoptera. 



Genus FUIXAWAYEIXA Del Guercio. 



1911. Fullaway ella Del Ctuercio, Redia, v. 7, p. 462. 



1916. Micromyzus, Van der Goot, Zur Kenntniss der Blattlafise 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 Icirkaldyi. 



Characters. — Antennge 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 



