Nothopleurus santacruzensis

Male. Integument dark brown. Dorsal surface of head depressed; coarsely, deeply, confluently punctate, punctures smaller toward frontal suture; front and clypeus shallowly punctate, with scattered, long erect hairs. Labrum subperpendicular to clypeal margin, clothed with long, moderately dense hairs; triangular projection rounded at apex. Post-ocular region coarsely, confluently punctate around lower eye lobe, granulated medially, with scattered punctures extending toward gula. Genal apex projecting laterally, rounded. Hypostomal area depressed, coarsely vermiculate, punctate antero-medially. Mandibles approximately 1.2 times longer than head, greatly enlarged beyond base, narrowed at apical two-thirds and then onward to apex; dorsal carina elevated from base to near apex, terminating in an approximately 45º angle to the dorsal surface of apical tooth; external surface punctate, internal surface concave, densely clothed with long, erect hairs; inner margin with three consecutive teeth at apical one-third, sinuated at basal two-thirds; ventral surface slightly excavated longitudinally, with scattered punctures at base, becoming abundant at apical one-third; apex narrow, outer apical tooth acute, inner apical tooth obtuse. Antennae surpassing the middle of elytra; scape curved, strongly enlarged toward apex, surpassing the posterior margin of the eye.
Prothorax transverse; anterior angles rounded, feebly projected; posterior angles obtuse or rounded; lateral margin feebly crenulate; anterior margin feebly concave; posterior margin sinuate. Shining callosities of pronotum feeble, surrounding area of disk finely, closely punctate, punctures anastomosing towards lateral margin. Prosternum and intercoxal process closely punctured; proepisternum with punctures more scattered than on prosternum. Mesosternum closely, finely, confluently punctate, laterally clothed with fine, dense pubescence. Mesepisternum and mesepimeron finely granulate-punctate, clothed with short, moderately dense pubescence. Metasternum with an impunctate, triangular, median area, remainder finely, densely punctate and pubescent. Metepisternum finely granulate-punctate, with fine pubescence more conspicuous than that of metasternum. Elytra nearly impunctate, sometimes feebly ridged longitudinally; sutural apex with a short spine. Urosternite I-IV finely granulate laterally; apex of fifth urosternite truncate, apically fringed with long hairs.

Female. Similar to male, differing as follows: antennae attaining basal one-third of elytra; scape not surpassing posterior margin of eye; hypostomal area with coarse, anastomosing punctures; pronotum without discal callosities, disk finely, irregularly punctate, punctures becoming coarser laterally; prosternum with fine, scattered punctures; apex of fifth urosternite convex.

Dimensions in mm (male / female). Total length (include mandibles), 20,2-42,8 / 28,9-35,5; prothorax: length, 3,4-6,9 / 4,6-6,2; Larger width, 6,1-12,0 / 8,0-10,1; elytral length, 13,6-24,6 / 18,9-25,2; humeral width, 6,0-11,5 / 8,5-11,1.

Type material. Holotype male, BOLIVIA, Santa Cruz.

Comments. Nothopleurus santacruzensis sp. nov. resembles N. subcancellatus (Thomson, 1867), but males differ from that species as follows: mandibles longer and narrower at apical third; dorsal carina of the mandibles sub-linear; scape clearly surpassing the posterior margin of the eye; hypostomal area not tumid, vermiculate; anterior prothoracic angles short and feebly projecting anteriorly. In N. subcancellatus the mandibles are shorter and slightly narrowed at apical third; the dorsal carina of the mandibles is convex at middle; the scape usually does not surpass the margin of the eye; the hypostomal area is tumid, not vermiculated, or very slightly vermiculate antero-medially; the anterior angles of the prothorax are large and strongly projecting anteriorly. Females differ as follows: scape reaching the margin of the eye; anterior prothoracic angles narrowed and feebly or not at all projecting anteriorly; in female N. subcancellatus the scape does not reach the margin of the eye, and the anterior prothoracic angles are relatively large and strongly projecting.
In two paratype females of N. santacruzensis sp. nov. the genal apex is slightly bifid, a character shared with some female specimens of N. subcancellatus. Mallodon dasystomus baiulus Erichson, 1847 females are very similar in general appearance, but can easily be distinguished by the form of the metepisternum: narrow and frequently concave at inner margin in N. santacruzensis sp. nov. wide and convex at inner margin in Mallodon.

Etimology. Named for the region of the type locality, Santa Cruz, Bolivia.
Acknowledgements. To Dr. J. E. Wappes (AMCM) and Dr. Michael Thomas (FSCA) for the loan of specimens.

Location: Bolivia