NO. 3548 ARADIDAE — KORMILEV 17 



until 1958 that the author learned the first manuscript was definitely 

 lost; his redescription was prmted in a different magazine in March 

 1959. Meanwhile, in January 1959, the genus was described by 

 Usinger and Matsuda under the name of Placogenis; because the lat- 

 ter has priority, Diphyllonotus went into its synonymy. 



The species of Placogenis are generally macropterous, but P. 

 brachyptera (Kormilev) was recorded as both macropterous and 

 brachypterous. The species may be best separated by the relative 

 lengths of antennal segments. 



Key to Species of Placogenis 



1. Antennal segment I long, produced beyond apex of genae by at least two-fifths 



of its length; head much longer than width across the eyes 2 



Antennal segment I shorter, produced beyond apex of genae by at most one- 

 fourth of its length; head as long as width across the eyes 3 



2. Antennal segment I longer than IV (11:9.2), and much shorter than III 



(11:14) cockerelli Usinger and Matsuda, 1959 



Antennal segment I as long as IV (11:11), and shorter than III (11:13). 



explanata (Kormilev), 1959 



3. Antennal segment I as long as (10:10, brachypterous form), or slightly longer 



than IV (11:10, macropterous form), and shorter than III (10:13). 



brachyptera (Kormilev), 1956 



Antennal segment I shorter than IV (10:11), and much shorter than III 



(10:15) clarkei, new species 



Placogenis clarkei, new species 



Figures 12, 13 



Female. — Ovate; macropterous. 



Head as long as width across eyes (21.5:22). Anterior process 

 long, parallel-sided, anteriorly cleft; genae much longer than clypeus, 

 reaching apical fourth of antennal segment I. Antenniferous tubercles 

 acute, parallel- sided reaching basal fourth of antennal segment I. 

 Eyes small, semiglobose, protruding. Postocular tubercles small, 

 acute, reaching outer border of eyes; postocular borders oblique, 

 converging backward. Vertex with V-shaped rows of small tubercles. 

 Antennae long, strong, twice as long as head (44:21.5); proportions 

 of antennal segments 10:8:15:11. Rostrum short, reaching hind- 

 border of rostral groove, latter open posteriorly. 



Pronotum trapezoidal, haK as long as width across humeri (22:44). 

 Collar thin, well separated from the disc. Anterolateral angles 

 rounded, expanded, slightly reflexed; produced forward far beyond 

 the collar; lateral borders parallel at hindlobe, convergent anteriorly. 

 Lateral notch almost imperceptible. Hindborder feebly and widely 

 sinuate. Foredisc with foiu" (2+2) calloused spots, surrounded by 

 a row of granules. Hind-disc roughly granulate. 



