Pensus hirtus Halstead

Halstead, David G. H., 2020, New and little known Coleoptera (Silvanidae: Silvaninae) from Central and South America, Insecta Mundi 2020 (842), pp. 1-37: 14-15

publication ID

publication LSID

persistent identifier

treatment provided by


scientific name

Pensus hirtus Halstead

new species

Pensus hirtus Halstead   , new species

( Fig. 39–45 View Figures 39–45 , 124 View Figures 123–124 )

Description. This description is based on the type series of 3 males and 6 females. Length of body, 2.94–3.96 mm; length to breadth ratio (breath, maximum across elytra), 33.0–38.7:10.0; dark brown, glossy; head and pronotum slightly darker than elytra; dorsal pubescence, consisting of long suberect setae, obvious but may become slightly rubbed; ventral pubescence also easily seen; spaces between punctures smooth, without ocellate punctures.

Head. Breadth (across eyes) to length ratio, 11.94–14.63:10.00; punctures deep, mostly slightly larger than eye facets and each bearing one long, fine seta, interspaces smooth (glossy); temples very short, only slightly longer than an eye facet but easily seen ( Fig. 39, 40 View Figures 39–45 , 124 View Figures 123–124 ); eyes small, dorsally separated across head by 7.3–9.8× breadth; antennae about a third as long as body.

Pronotum. Length to breadth ratio 12.02–13.67:10.00, pronotum in males very slightly more elongate than in females; ratio of pronotal breadth across anterior angles to head breadth across temples 12:10; anterior angles moderately developed; disc slightly depressed each side on apical two thirds. more obvious depressions on basal third ( Fig. 39 View Figures 39–45 ); puncturation on anterior region similar to that on head, becoming denser with larger punctures posteriorly; punctation between disc and sides of pronotum also dense with larger punctures.

Elytra. Length to greatest breadth ratio, 19.5–22.5:10.0; disc with 6 rows of punctures forming striae; lateral declivity with about 3 rows; long setae, as elsewhere, but arising from very small punctures on surface between rows of punctures ( Fig. 124 View Figures 123–124 ).

Legs. In female simple; in male there are secondary sexual characters as follows: metatrochanter with minute spine near apex; metafemur with prominent ridge on proximal side (hardly visible in dorsal view); metatibia moderately curved, proximal side with series of transverse ridges, appearing as conspicuous row of spines along most of the dorsal and ventral margins of the ridge.

Male genitalia ( Fig. 43–45 View Figures 39–45 ). Internal sac with long armature (as in other known Pensus spp.   see Halstead 1973, Fig. 80 View Figures 80–84 , not illustrated here); parameres subparallel to apical third then slightly curved out on distal margin before tapering to apex, a number of minute setae present along the former, apical margin bears long setae, 3 in only specimen dissected ( Fig. 42–43 View Figures 39–45 ); median lobe tapering to broad apical region ( Fig. 44 View Figures 39–45 ); sternite 8 with each part narrowed to apex and bearing bunch of setae, sternite 9 with apical margin fringed with short setae ( Fig. 45 View Figures 39–45 ).

Materials examined. Holotype male “Jabali, S. slope of Sierra de las Minas (N. of Cabanas) / Dept Zacapa VII: 28: 48 GUAT. Elev. 5500ft. / Under bark of log / CNHM Guatemala Zool. Exped. (1948) R. D. Mitchell leg.” ( CAS). The holotype was dissected, and the genitalia illustrated. It has lost much of the long pubescence.  

Paratypes. (8) Two males and four females, “ GUATEMALA: Zacapa Dept.: Santa Cruz Marble Quarry rd NeE of Teculutan 1539m 17 May 2006. N 15° 04.454′ W 89° 41.074′ R. S. Zack collector” ( WSU, FSCA). 1 female, “ GUATEMALA: Dept. Zacapa, Sierra de los Minas, “El Naranjo” S. slope below San Lorenzo Mine, vic 15.07329, −89.68481, 1600–1700m 21-24-v-2010, P. Skelley, G. Steck & B. Sutton, oak forest” ( FSCA). 1 female, “GUA- TEMALA: Zacapa, Sierra de las Minas, 8km NW San Lorenzo, 6-vi-2007 cloud forest. B. Sutton, Monzon & Camposeco” ( FSCA).


California Academy of Sciences


Weber State University, Bird and Mammal Collection


Florida State Collection of Arthropods, The Museum of Entomology