148 U.S. NATIONAL MUSEUM BULLETIN 261 



32. Genus ABANA Distant 



Figures 137-139 

 Abana Distant. 1908b:72. Type-species: Aulacizes dives Walker, by original 



designation. 

 Mesobana Melichar, 1926a:322. Type-species: Amblydisca pomposula Jacobi, 



by subsequent designation of Metcalf, 1965a:645. 



Length 1 7-20 mm. 



Head well produced, median length usually equal to or exceeding 

 interocular width, apex carinate or not, ocelli located on or slightly 

 behind a line between anterior eye angles, each ocellus equidistant 

 between midline of crown and adjacent anterior eye angle or slightly 

 nearer latter, nearly always with an M -shaped elevation bordering 

 posterior margin, with or without a median longitudinal fovea, without 

 a longitudinal keel laterad of each ocellus, disc without pubescence; 

 antennal ledges in lateral aspect nearly always longitudinally sulcata 

 and carinate dorsally, anterior edges steeply declivous; clypeus de- 

 pressed or at least flattened, muscle impressions distinct; face finely 

 pubescent below; clypellus protuberant, its contour almost at right 

 angle to profile of face, without a median carina. 



Thorax with pronotal width exceeding transocular width of head, 

 lateral margins convergent anteriorly, disc declivous anteriorly, punc- 

 tate and occasionally rugose, without pubescence, in lateral aspect with 

 complete dorsopleural carina which is arched slightly downward at 

 midlength, posterior margin concave; scutellum transversely striate 

 in posterior half. Forewing with or without an apical membrane (intra- 

 specifically inconstant), veins elevated and distinct, clavus and corium 

 strongly coriaceous, both usually conspicuously punctate, with four 

 apical cells, the base of fourth more distal than base of third, without 

 an anteapical discal plexus of veins on corium but with anteapical 

 supernumerary veins to costal margin; wings of female at rest concealing 

 apex of ovipositor or not. Hindwing at rest extending nearly as far 

 posteriorly as apex of forewing; vein R2+3 obsolete. Hindlegs with 

 femoral setal formula 2:0:0, 2:1:0, or 2:1:1; first tarsomere shorter 

 than combined length of second and third. 



Male genitalia : Pygofer in lateral aspect angularly produced, abruptly 

 narrowed on dorsal margin near midlength, with sparse microsetae 

 uniformly distributed over disc, without processes. Plates separate 

 throughout their length, extending not quite as far posteriorly as 

 pygofer apex, triangular, with lower pygofer margins tightly pressed 

 against their lateral margins in dried specimens, each plate with a 

 number of dispersed microsetae. Style very short, extending about as 

 far posteriorly as apex of connective, with preapical lobe, apex acute. 

 Connective narrowly Y-shaped, with stem much longer than arms, 

 gradually broadened apically, not keeled. Aedeagus symmetrical with 



