Sambomorpha corona, López-Guerrero, 1924

López-Guerrero, Irma, 1924, Figs. 30 – 33. Attavicinus monstrosus. 30 in Comparison of Mouthpart Morphology of Three Species of Mexican Oniticellini (Coleoptera: Scarabaeidae: Scarabaeinae) in Relation to Their Trophic Habits, The Coleopterists Bulletin 1924 (3), pp. 471-475 : 471-475

Sambomorpha corona , new species

( Fig. 2 )

Description of holotype. Gender unknown, small, length 3.7 mm from anteriormost point of frontovertex between eyes to elytral apex, width 1.1 mm at widest posterior midpoint of pronotum, equal to elytral width posterior to humeri; elongate, ovoid; flattened above, feebly transversely convex below; color black with faint bluish reflections, except frontovertex and scutellum which have both bluish and purplish reflections; surface of head, pronotum and thoracic ventrites imbricate; head, pronotum and lateral portions of thoracic and abdominal ventrites finely, transversely rugose; posterolateral section of pronotum with several short, irregular, transverse, elevated carinae discad to premarginal carina; premarginal pronotal carina strongly arcuately convex when viewed from side, extending from posterior margin to about anterior 1/3; surface of metepisternum

471

472 with several oblique elevated rugae; anterolateral portion of abdominal ventrite 1 imbricate in metafemoral depression; elytra coarsely shagreened; abdominal ventrites finely punctate; dorsal surface with irregular pattern and densities of short, recurved, stout white setae as follows: pronotum with setae slightly concentrated in small, distinct, discal patches, two anterolateral in anterior 1/3, two on either side of midline just anterior to middle, two in posterolateral depression on either side but inside premarginal carinae; elytra with concentrations in medial portion just posterior to scutellum, with broad irregular fasciae anterior to midpoint, one irregular fascia between posterior 1/3 to 1/4, then two small spots, one on each elytron preapically; thoracic ventrites with sparse, stout adpressed white setae and abdominal ventrites with very sparse covering of fine white adpressed setae.

Head with frontovertex with longitudinal groove widening to broad depression between slightly anteriorly produced, feebly arcuate lobes between large eyes; eyes elliptical, each with narrow black margin; circumocular groove from beyond dorsal-most point along inner margin until becoming confluent with narrow, horizontal genal groove for reception of basal antennomeres in repose; antennal cavities large, widely separated, each bordered dorsally by small transverse groove; frontoclypeus with distal margin angularly emarginate; gena broadly obtusely lobed beneath eye; antennae with antennomere 1 short, robust; 2 subequal to 1; 3 slightly shorter, more robust than 2; 4 subequal to, but slightly wider apically than, 3; 5–10 triangularly serrate, each with width subequal to length; 11 oblong, slightly oblique to 10.

Pronotum slightly more than 1.6 times wider than long, widest posterior to midpoint; anterior margin arcuate medially; posterior margin angularly bisinuate on either side of medial arcuate lobe, narrow marginal fringe nearly impunctate across entire width except along feebly crenulate posterior margin; posterolateral angles obtuse; lateral margin straight, oblique from posterior margin then becoming broadly arcuate, widening from base to before midpoint, then narrowing to anterior margin, margin slightly explanate, carinate along entire length; disk with a broad, shallow depression on either side in posterolateral portion; one strongly arcuate premarginal carina on either side. Scutellum relatively large, subcordiform, acuminate posteriorly.

Elytra as wide as pronotum, widest opposite humeri, depressed basally between humerus and scutellum; lateral margin narrowing from opposite humeri to past anterior 1/3, then widening gradually to before posterior 1/3, before narrowing to separately, broadly rounded, serrulate apices; lateral margin carinate from anterior margin to about midpoint, separating disk from epipleuron, which is widest anteriorly, narrowing to fine margin before becoming confluent at a point opposite midpoint of abdominal ventrite 1; disk more or less even, flattened medially, rounded laterally; sutural carina becoming slightly more pronounced toward apex.

Prosternum with broadly bilobed mentonierre, a deep transverse groove posterior to anterior margin; hypomeron with anterior groove continuing from genal groove for distal antennomeres in repose; narrow lateral portion of hypomeron beneath pronotal carina and laterally produced away from plane of disk; metacoxa short, broad, with posterior margin bisinuate to rounded acute posterolateral angle which is visible from above; length of adominal ventrites 1 and 2 together greater than 3–5; suture between 1 and 2 only faintly visible laterally; sutures between 2, 3, 4 and 5 feebly arcuate; distal margin of 5 medially emarginate; fine marginal groove present between the abdominal pleurites and ventrites, extending premarginally around entire margin of 5; pygidium not visible from above.

Legs: femora slightly fusiform proximally; tibiae subcylindrical, slender; pro-, mesotibiae shorter than femora, metatibia slightly longer than metafemur; metatibia with setal comb on external edge from about proximal 1/3 to just before distal end; tarsi with tarsomeres 1–4 each short, with ventral pulvilli that are slightly longer from 1 to 4; 5 narrow, elongate, subequal in length to 1–4 together, claws bifid, inner claw much shorter.

Genitalia: not dissected, gender unknown.

Comment. The elytra of the holotype were somewhat splayed ( Fig. 2 ) upon receipt and during the process of examination for description, the left elytron was dislodged and is now mounted on the same point as the specimen.

Specimens examined. Holotype ( INBC): Est. Queb. Bonita, 50 m, Res. Biol. Carara, Prov. Puntarenas, Costa Rica, 1 a 29 jul 1992, R. Guzman , L-N 194500, 469850/barcode Costa Rica INBIO CR1000 750459.

Etymology. This new species is named for Angélica Maria Corona López, in honor of the attainment of her Ph.D. from the Universidad Nacional Autónoma de México, México City.

Comments. Sambomorpha corona differs from S. costarica Bellamy, 1997 ( Fig. 1 ) as follows:

Figures

Figures 1–3. Sambomorpha spp. Fig. 1) S. costarica Bellamy, 1997, holotype; Fig. 2) S. corona, sp.nov. holotype; Fig. 3) S. panama, sp. nov. holotype. Scale bars 5 1.0 mm.