REVISION OF THE TRIBE PAEDERINI — BLACKWELDER 99 



Head and pronotum densely and very finely punctate or sculp- 

 tured, without any umbilicate punctures except at margins.. Li thocharia 



A. Qular sutures widely diverging posteriorly subgenus Psendomedon 



Qular sutures most approximate posteriorly or along middle B 



B. Qular sutures distinctly converging posteriorly C 



Qular sutures parallel along middle subgenus Ophiomedon 



C. Labrum with a median tooth. subgenus Lithocharia 



Labrum with 2 denticles near center subgenus Stilocharis 



31. Labrum with median tooth or prominence 32 



Labrum without median tooth 33 



32. Umbilicate punctures of head sparse and not strong Aderocharis 



A. Labrum without additional denticles; umbilicate punctures small; vertex not 



grooved above neck B 



Labnim with 2 additional denticles; umbilicate punctures very large; vertex 

 deeply grooved above neck subgenus Dorocharia ' 



B. All punctures distinctly umbilicate, generally even subgenus Aderocharis 



Umbilicate punctures very sparse, with dense and fine csometlmes tubercu- 



late) punctures between subgenus Panscopaens 



Head densely and strongly umbilicately punctured Stilotnedon 



A. Qular sutures separate; labrum with 2 additional denticles subgenus Stilomedon 



Qular sutures united; labrum with 4 additional denticles subgenus Polymedon 



33. Gular sutures united in great part Neomedon 



Gular sutures not at all united 34 



34. Gular sutures distinctly diverging posteriorly from before middle.Hypomedon 



A. Head and pronotum very densely punctate or sculptured B 



Head and pronotum sparsely punctate, shining subgenus Ollgopterns 



B. Head with umbilicate punctures very dense; without distinct ground sculpture.. O 



Head with umbilicate punctures not very dense; with distinct ground sculp- 

 ture. subgenus Hypomedoo 



O. Prosternum not at all carlnate at any point subgenus Trachysectiui 



Presternum strongly carinate posteriorly subgenus Calodeima 



Gular sutures most approximate along middle or at base Medon 



A. Punctures of head very irregular, of various sizes, some distinctly umbilicate; 



without distinct ground sculpture. subgenus Tetramedon 



Punctures of head nearly all of one type, distinctly umbilicate; with or without 

 ground sculpture B 



B. Head with dense ground sculpture; umbilicate punctures moderate, generally 



separated by their diameter or more 



Head without ground sculpture; umbilicate punctures large, generally sepa- 

 rated by less than one-half their diameter.. subgenus Medon 



C. Punctures of head almost completely obscured by sculpture; head distinctly 



cordate; body strongly depressed; gular sutures converging to base; proster- 

 num carinate throughout subgenus Medonodonta 



Punctures of head not much obscured by sculpture; head not cordate: body not 

 strongly depressed; gular sutures most approximate along middle; proster- 

 num carinate only posteriorly. subgenus Paratnedoa 



' Dorocharls, new subgenus. Diagnosis: Characters of genus Aderocharis except as follows: Umbilicate 

 punctures of head and pronotum very large; vertex deeply grooved above the neck; labrum with two addi- 

 tional denticles; neck scarcely one-fourth as wide as head. 



Aderocharia (Dorocharis) chaptni. new species. Description: Uniform rufotestaceous throughout. Head 

 somewhat emarginate at base, posterior angles narrowly rounded, vertex above neck deeply grooved longi- 

 tudinally; eyes small, at about four times their length from base; labrum tridentate, teeth within a broad and 

 abrupt emarginatlon; gular sutures very approximate throughout but not imited; punctures rather large, 

 distinctly umbilicate, not crowded on disk, almost absent between antennal prominences; with minute 

 punctulae scattered between the large punctures. Pronotum slightly wider than long, widest at anterior 

 angles, somewhat produced to neck, moderately narrowed posteriorly to obtuse basal angles; punctation 

 similar to that of head, with a trace of smooth midline posteriorly. Elytra wider than long, not punctate 

 except for setlgerous tuberculi which are prominent but not dense, surface between rather finely coriaceous; 

 each elytron with three longitudinal impressions on the disk. Abdomen sculptured as elytra; ninth tergite 

 deeply semicircularly emarginate. Male, eighth sternite very feebly emarginate. Female, eighth stemite 

 not emarginate. Length, 7^ mm. Tj/pe locality, Costa Rica, Hamburg Farm, Reventazon. Types, holo- 

 type, male, and two paratypes, female, U.S.N.M. No. 52662, collected by Ferdinand Nevermann. 



