634 PROCEEDINGS OF THE NATIONAL MUSEUM 



VOL. Ill 



12. Anterior pronotal lobe laterally with two to four irregular rows of close 



coarse punctures similar in size or larger than those of transverse impres- 

 sion; mesocorium with large impunctate area on disc 13 



Anterior pronotal lobe with lateral punctures finer than those of transverse 

 impression; mesocorium sparsely but uniformly punctate on disc. 



lateralis Signoret (p. 618) 



13. Corium with longitudinal brownish line along radial vein extending to costa 



along apical margin; umbone distinctly paler than remainder of pronotal 



disc radialis, new species (p. 656) 



Corium without brownish line along radial vein; umbone concolorous with 

 remainder of pronotal disc 14 



14. Lateral pronotal margins slightly but distinctly concave at basal fourth; 



corium becoming fuscous on apical third or more. 



brunneus Signoret (p. 639) 

 Lateral pronotal margin straight on basal half; corium uniformly yellowish. 



lautipennis (St&l) (p. 649) 



15. Pronotal umbones prominently, closely punctate over surface. 



bolivari (Signoret) (p. 637) 

 Pronotal umbones in great part not punctate 16 



16. Male: Subapical ventral spine of posterior femur more than one-third length 



of tibii! (fig. 164). Female: Last sternite with medially flattened, glabrous 

 area delimited laterally by partial or complete, obtuse, longitudinal 



carinae (fig. 184) pusillus Uhler (p. 652) 



Male: Subapical ventral spine of posterior femur shorter than vertical 

 height of femur. Female: Last sternite without flattened glabrous area, 

 or if present, not so delimited laterally 17 



17. Middle third of costa narrowly expanded, reflexed, forming shallow trough 



nearly as wide as middle tibia .... explanatus, new species (p. 649) 

 Corium convex to margin, neither explanate nor reflexed in middle third . 18 



18. Clypeus convex, with prominent, transverse rugae; coria with obscure 



fuscous cloud across middle and at apex . . diminuatus Barber (p. 613) 

 Clypeus not transversely rugose; coria unicolorous hyaline-yellow ... 19 



19. Male: Anterior tibia with distinct, subbasal spine ventrally (fig. 132). 



basidentatus, new species (p. 634) 

 Male: Anterior tibia without subbasal spine ventrally . . pusio (St&l) (p. 654) 



Anmestus basidentatus ^ new species 



Plate figures 132, 285 



Diagnosis. — The males of this species can be separated from males 

 of all others in the genus by the distinct subbasal spine on the ventral 

 margin coupled with short, ventral, subapical spine on posterior tibia. 

 The females of basidentatus and pusio will run easily to the last 

 couplet of the key, but the author is unable to separate that sex of 

 these two species by a practical key character. 



Description. — Color: Light brownish yellow, coria, legs, and 

 labium slightly but distinctly paler. 



Male.- — Elongate, parallel-sided. 



Head: Length almost three-fourths width, 0.37(0.37-0.39) :0. 50 

 (0.49-0.52); interocular width, 0.29(0.29-0.30); clypeus slightly 

 longer than juga; latter with four marginal pegs; surface, except 



