NO. 9 GENUS CHLAENOBIA BLANCHARD CHAPIN I 5 



CHLAENOBIA COLIMANA Arrow 



Chlaenobia colimana Arrow, 1933, Ann. Mag. Nat. Hist., ser. 10, vol. 11, p. 145. 



Head rather sparsely and moderately densely punctured on frons, 

 median line, vertex and along the lightly impressed and feebly sinuate 

 clypeofrontal suture almost free of punctures. Frons almost plane. 

 Clypeus not concave, its outer margin slightly reflexed and very 

 feebly indented at middle. Antenna ten-segmented. Pronotum trans- 

 verse, side margins very obtusely angulate before the middle, lateral 

 margin strongly sinuate just before the posterior angle as viewed 

 from side, viewed from above anterior and posterior angles acute ; 

 punctures coarse and rather sparse on disk, finer and sparser on 

 flanks. Scutellum equilateral, with a few coarse punctures along side. 

 Elytra with sutural margin broadly tumid at middle of length, nar- 

 rowed basally and apically, discal costae almost completely efifaced ; 

 punctures a little finer and as densely placed as those on pronotal disk, 

 epipleura very narrow, disappearing just before the extreme apex. 

 Metasternum very finely and densely punctured on median portion, 

 more coarsely and sparsely at sides, vestiture short and erect, absent 

 from a minute spot at center. 



Male. — Antennal club half again as long as second to seventh 

 segments combined. Abdominal sternites short and crowded along 

 median line, sixth sternite as long, along median line, as fourth and 

 fifth combined, its median portion flattened and with a poorly defined 

 longitudinal groove. Pygidium strongly convex, apical half sparsely 

 hairy, apical margins transverse and slightly lipped. Anterior tibia 

 slender, bidentate with a trace of a third tooth, second segment of 

 anterior tarsus elongate oval, about three times as long as wide. 

 Aedeagus, figure 7. 



Female. — Antennal club very slightly longer than second to seventh 

 segments combined. Abdominal sternites somewhat flattened along 

 median line but not concave, sixth sternite long, with its free margin 

 bisinuate. Pygidium with a single well-developed median tubercle 

 on basal half, apical two-thirds cut away and with a deep, narrow 

 median groove extending from below the tubercle toward apex. 

 Apical margin with two small processes which fit into the sinuations 

 at apex of sixth sternite ; concave portion sparsely hairy. Anterior 

 tibia slender, tridentate. 



Length. — 13.5 to 16.5 mm. 



Type locality. — Colima, Mexico. 



Type. — In the British Museum. 



