African Phytophagous Coleoptera, 335 
Platyxantha nigromarginata, sp. n. 
Flavous, the antennjB, the apex of the tibiae and the tarsi, 
black, thorax bifoveolate with black lateral margins, elytra finely 
and closely punctured, flavous, narrowly margined with black. 
Var. Antennae and legs flavous. 
Mas. Antennae as long as the body, the head with two deep 
excavations. 
Fem. Antenna shorter, the head normal. 
Length, 3-4 lines. 
Mas. Head broad, impunctate, the frontal tubercles strongly 
raised, broadly transverse, lower portion of face deeply hollowed 
out, the excavation divided by a central ridge, terminal joint of 
palpi acute ; antennae as long as the body, the basal joint flavous 
below, long and curved, the second one very short, moniliform, 
third joint longer than the fourth, the following joints slightly 
curved ; thorax more than twice as broad as long, the lateral 
margin rounded and widened at the middle, narrowly black, as well 
as part of the posterior margin ; the surface with two obsolete 
depressions, impunctate, fulvous or flavous ; scutellum black ; 
elytra very closely and finely punctured, the interstices very 
obsoletely longitudinally grooved, flavous, all the margins narrowly 
black, as well as the inner and outer margins of their epipleuras ; 
underside and legs flavous ; the lower half of the tibiae and the 
tarsi more or less black, tibiae unarmed, anterior cotyloid cavities 
closed, the first joint of the posterior tarsi rather longer than the 
following joints together, last abdominal segment with lateral 
incisions, the median lobe broader than long. 
Hah. Mashunalandj Salisbury ; also Delagoa Bay 
(Mrs. Monteiro). 
Platyxantha costatipennis, sp. n. 
Metallic-blue, the basal joint of the antennae and the femora 
fulvous, thorax punctured, bifoveolate, elytra rugose-punctate, each 
with four narrow longitudinal costae. Length, 3 lines. 
Head impunctate, metallic-blue or green, the frontal tubercles 
strongly raised, clypeus aeneous, palpi black, moderately thickened ; 
antennae extending to the middle of the elytra, black, the lower 
two joints fulvous, the basal joint long and slender, second one 
very short, third and fourth equal, rather elongate, the following 
joints slightly shorter and somewhat thickened ; thorax twice as 
broad as long, the lateral margins rounded at the middle, narrowed 
at the base, the surface metallic-blue or green, bifoveolate, the 
