READING PUBLIC MUSEUM AND ART GALLERY

20 THE TRIBE ONCIDERlNI
Elytra with humeri angulated, basal gibbosities more strongly elevated, not
beginning at c}.i;reme base, arcuate, not parallel, not granulated along crest,
usually marked with bright orange-fulvous pubescence .. . ...... i3
12. Elytra each with a single row of small; sparse granules basally; antennal third
segment strongly bisinunte, scape in male robust, more strongly clavate
dejeanii (p. 26)
Elytra with one or two rows of coarse, crowded granules basally; antennal
third segment not strongly bisinuous, scape less robust, less clavate apically
rimosa (p. 24)
13. Antennae with nnnulation of fourth and following segments covering only
their basal thirds, surface only slightly paler beneath annulate portions
than apically ; elytra with basal gibbosities broader, their basal portions
more or less paralleling suture; procoxae in male with an elongate tubercle
chapadensis (p. 22)
Antennae with nnnulation of fourth and following segments gradually increasing
in width from one-fourth of the segments' length proximally, to one­
half or more distally, surface beneath annulation testaceous; elytru with
basal gibbosities narrow, their apical portions more or lcsa paralleling, and
close to, suture; procoxae in male with a short, obtuse tubercle
gibbera (p. 21)
14. Pronotum on disk with a large, rounded gibbosity each side and a tubercle at
middle; metatibiae in male only feebly dilated; eye with lower lobe distinctly
higher than gena. ................. ..... .robusta (p. 39)
Pronotum on disk with five distinct tubercles; metatibiae in male strongly
dilated apically; eye with lower lobe at most feebly higher than gena, usually
shorter than it ...................... ............... ... . ...... 15
15. Abdomen medially predominantly gray pubescent ....... 16
Abdomen medially predominantly brown pubescent ..................... 17
16. Antennae with bases of segments from fourth with surface coloring bright
reddish-brown or testaceous; humeri wit.h angle rounded; antenna! third
segment one-fourth longer than scape...... . . . am-ydon (p. 36)
Antennae with segments from fourth with surface not paler basally; humeri at
angle with a large, rounded tubercle; antennal third segment only feebly
longer than scape.......... ........ . . . lyca (p. 34)
17. Elytra without flecks of white pubescence......... . ........ basilis (p. 37)
Elytra with flecks of white pubescence ................................ 18
18. Elytra on sides vittate with fulvous from humeri nearly to apex, attenuate
apically; male with an elongate tubercle all procoxae . . . . . . .. nesiope (p. 33)
Elytra not vittate laterally; male with a short tubercle all procoxae ........ 19
19. Scutellum with a distinct brown vitta medially; elytra with white flecks very
sparse . .. . . . . .. . . . . . .. . .. . . . .. . . . . . . . ' . .............. consteUata (p. 28)
Scutellum not distinctly brown vittate medially ; elytra with white flecks more
numerous . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
20. Front broad, more than half as wide at narrowest point as long; lower lobe
of eye in male slightly longer, in female vcry slightly shorter, than gena
pylades (p. 31)
Front narrow about one-third as wide at narrowest point as long; lower lobe
of eye in both sexes only two-thirds height of gena .......... chascba (p. 30)