Agathidium grumum Miller and Wheeler, 2005

MILLER, KELLY B. & WHEELER, QUENTIN D., 2005, Slime-Mold Beetles Of The Genus Agathidium Panzer In North And Central America, Part Ii. Coleoptera: Leiodidae, Bulletin of the American Museum of Natural History 2005 (291), pp. 1-167 : 101-102

Agathidium grumum Miller and Wheeler ,

new species Figures 129 , 210–212, 362

TYPE MATERIAL: Holotype, Ƌ in AMNH labeled ‘‘ MEXICO: HIDALGO 5 mi NE Acatzingo 27. VI.1975 Q.D.Wheeler [handwritten]/ HOLOTYPE Agathidium grumum Miller and Wheeler, 2003 [red label with black line border]’’.

TYPE LOCALITY: Mexico, Hidalgo, 5 mi NE Acatzingo.

DIAGNOSIS: Members of this species can be distinguished from others by the presence of a prominent medial tumidity on the gula, the large, acutely pointed male metafemoral tooth (fig. 129), and the shape of the male genitalia, which are relatively undifferentiated (figs. 210–212). There is a distinct sutural stria on the apical one­third of the elytron. This species is similar to A. popocatepetlae (including the shape of the male genitalia), but that species has a smaller male metafemoral tooth (fig. 133) and lacks the tumidity on the gula.

DESCRIPTION: Body moderately large (TBL = 3.12 mm), broad, robust (PNW/TBL = 0.48), rounded, strongly contractile.

Head and pronotum dark red; elytra dark red­brown, not iridescent; venter yellow; antennae, palpi, and legs yellow.

Head broad (MDL/OHW = 0.59), dorsal surface flattened, dorsoventrally compressed; with very fine punctures, each with a short, very fine seta, surface between punctures shiny, very lightly microreticulate; frontoclypeal suture obsolete medially; eyes moderately large, only slightly compressed; gula with prominent medial tumidity; antennomere ratios: length I:II:III = 2.4:1.0:1.9, width VII:VIII:IX = 1.0:1.0:2.0. Pronotum very large, broad (PNL/PNW = 0.71), strongly convex, anterolateral lobes strongly produced, lateral margin broadly curved, not angulate; with fine, sparse punctures, each with a short, very fine seta, surface between punctures shiny, smooth. Elytra broad, lateral margins strongly rounded, apically rounded (SEL/ELW = 1.01); punctation and surface similar to pronotum; sutural stria present in apical one­third of elytron. Flight wings strongly reduced. Mesosternum moderately broad, not declivitous; medial carina well developed, slightly obscured anteriorly. Metasternum narrow (MTL/MTW = 0.14), slightly concave medially, distinctly dorsally sloped anteriorly; oblique femoral carinae moderately well developed, meeting medially in low, but prominent, posteriorly directed carina.

Male tarsi 5­5­4; pro­ and mesobasotarsomeres only somewhat laterally expanded, with moderate ventral field of spatulate setae; mandibles not modified; metafemur moderately broad, with very large, flat, triangular tooth subapically on posterior margin (fig. 129); metasternal fovea large, transversely oval with large, dense brush of long fine setae. Median lobe in lateral aspect moderately long, moderately stout, strongly bent basally, apical portion slender, angled dorsad, apically curved ventrad, acutely pointed (fig. 211); in ventral aspect moderately broad, parallelsided, apically evenly narrowed to narrowly rounded apex (fig. 210); operculum flat, moderately broad, evenly narrowed to round­ ed apex (fig. 210); lateral lobes long, slender, slightly expanded and slightly sinuate apically, apices rounded with 2 stout setae (fig. 212).

Female not examined.

ETYMOLOGY: Named from the Latin word grumus, meaning ‘‘mound’’, for the prominent medial tumidity on the gula.

DISTRIBUTION: This species is known from southern Mexico (fig. 362).

PARATYPES: MEXICO: Mexico: 2 mi NE Tenancingo , 11 Sep 1973, 7100̍, litter, pine­madrosaoak forest, Berlese, A Newton (1, CNCI) ; Morelia , 7 mi S Tres Cumbres, 7 Jul 1975, QD Wheeler (13, QDWC) .

DISCUSSION: Habitat records for this species are from pine­oak forest litter at 7100 ft elevation.

Figures

Figs. 118–144. Agathidium concinnum­ and A. oniscoides­group species, left male metafemur, ventral aspect: 118, A. concinnum. 119, A. kimberlae. 120, A. vaderi. 121, A. bituberculum. 122, A. oedema. 123, A. gomezae. 124, A. hidalgoense. 125, A. skoliosternum. 126, A. erythromelas. 127, A. rhamphastes. 128, A. megoniscoides. 129, A. grumum. 130, A. triangularum. 131, A. lobosternum. 132, A. potosii. 133, A. popocatepetlae. 134, A. hyle. 135, A. stenomma. 136, A. tribulosum. 137, A. tribulograndum. 138, A. invisitatum. 139, A. multidentatum. 140, A. sejunctum. 141, A. grandidentatum. 142, A. andersoni. 143, A. disgregum. 144, A. oaxacaense. Bars = 0.5 mm.

Figs. 361, 362. Geographic distribution of Agathidium oniscoides­group species: 361, A. erythromelas = •; A. rhamphastes = -; A. triangularum = ^. 362, A. grumum = -; A. lobosternum = ^; A. megoniscoides = *.