Revision of trachyderines related to Sphaenothecus from North America with description of three new genera, and new species of Lophalia Casey, 1912, Mannophorus LeConte, 1854, and Ischnocnemis Thomson, 1864 (Coleoptera: Cerambycidae: Cerambycinae: Trachyderini) Author Eya, Bryan K. California Academy of Sciences 55 Music Concourse Drive, Golden Gate Park, San Francisco, CA 94118 USA text Insecta Mundi 2024 2024-07-26 2024 61 1 94 journal article 10.5281/zenodo.14662132 1942-1354 14662132 5671A77B-2ECB-445F-8F61-246A9E442CDE Ischnocnemis eyai Chemsak and Noguera, 1997 ( Fig. 333–345 ) Ischnocnemis eyai Chemsak and Noguera 1997: 11 ; Monné and Hovore 2006: 144 (cat.) Materials examined. MEXICO : Jalisco : 5.2 km S of El Tuito , 12 Nov. 1996 , on flowers of Cosmos , J.A. Chemsak , ( holotype male, allotype female, EMEC ; paratypes : 10 males , 3 females , EMEC ) ; B.K. Eya , 31 Oct. 1995 ( paratypes : 5 males , 3 females , BKEC ) . Discussion. Ischnocnemis eyai Chemsak and Noguera is “moderate sized (13–16.5 mm), elongate and slightly tapered posteriorly” ( Chemsak and Noguera 1997: 11 ). The integument is black, and the “pubescence is short, golden, erect, and depressed” ( Fig. 337–341 ). There are “four longitudinal, eburneous costae” on the elytra, a tarsomere 1 (T 1 ) longer (red brackets) than tarsomeres 2+3 (T 2+3 ), T 1 / T 2+3 : 1.1. Figures 333–345. Ischnocnemis eyai Chemsak and Noguera , dorsal and lateral images: 333–334) Male, 14 mm, 5.2 km S El Tuito, Jalisco, MEX. 335–336) Female, 15 mm, 5.2 km S El Tuito, Jalisco, MEX. Head: 337–339) Front vertical, mandibles retracted and angulated near base (blue arrow), dorsal half of genae narrow, base of mandibles almost contiguous with anterior margin of eye lobe (red arrow), integument clothed with short, golden pubescence. Pronotum: 340) Disc with sides broadly rounded, apical margin without collar-like projection on sides, integument clothed densely with golden, transverse, appressed pubescence. Thorax lateral profile: 341) Pronotal disc shallowly convex, mesosternal process non-protuberant (red arrow). Elytra: 342) Male with apices bi-emarginate truncate. 343) Female with apices rounded. 344) Each elytron with two narrow raised glabrous costae (red arrow), and a vague, longitudinal costa in between (yellow arrow). Metatarsi: 345) Meta- subsutural “pair near suture” and submarginal “pair extends back from under the humeri” ( Fig. 344 ). The front is moderately, finely subconfluently punctate, and vertex is subopaque, “moderately, finely, confluently punctate” with “short, golden, suberect” pubescence around the eyes. The “antennal tubercles are moderately produced.” The “antennae are slender, extending about three antennomeres beyond elytra” in males, and exceeding apices of elytra by an antennomere in females. The pronotum is “as broad as long (L/W: 0.9), side broadly rounded with apex very narrowly impressed” behind margin, and “base moderately broadly impressed” on sides. The pronotum is “finely, densely punctate with a longitudinal, glabrous callus” on basal half in middle, and integument covered densely with golden, transverse, appressed pubescence ( Fig. 340 ). The metasternum is densely punctate, obscurely covered with appressed golden pubescence and integument on either side of midline glabrous. The elytra are two and a half times longer than wide, sparsely clothed with short, suberect pubescence, and “sutures are narrowly black.” There are three costae on each elytron, an elevated eburneous subsutural costa extending from base almost to the apex with “broad, yellowish, longitudinal” vittae on either side, a submarginal, narrower eburneous costa extending from under the humerus to apical one-tenth, and another vaguely visible, longitudinal costae in between the two eburneous ones ( Fig. 344 ). The punctures on each elytron “between suture and costa,” and between costae are “fine, irregular, and separated, which becomes denser” apically, and punctures between the epipleural margin and submarginal costa are fine and subconfluent. The elytral apices are described as “vaguely sinuate-truncate” however, the apices of male ( Fig. 342 ) and female ( Fig. 343 ) examples are bi-emarginate truncate or rounded, respectively. The metatarsomere I is elongate and longer than tarsomeres II and III combined in this species ( Fig. 345 ). According to Chemsak and Noguera (1997: 11) , “the fine, transversely appressed, golden pubescence on the pronotum makes this species distinctive.” The mesosternal intercoxal process of this species is described as “not elevated above coxae and abruptly declivous anteriorly.” The elytral apices of I. eyai are described to be “vaguely sinuate-truncate” by Chemsak and Noguera (1997: 11) but are variable ranging from serrate-truncate, bi-emarginate-truncate, truncate, or rounded. The exterior angle of elytral apices in some specimens appear dentate due to the serration. This species superficially resembles Zalophia auricomis (Chemsak and Linsley) new combination from Honduras in coloration, and vestiture with “transversely appressed, golden pubescence” on pronotum ( Chemsak and Linsley 1979: 268 ); however, the front of I. eyai is vertical as in other Ischnocnemis species whereas Zalophia has front that is declivous in middle and integument impressed between antennal tubercles. The mesosternal intercoxal process of Z. auricomis is prominent, elevated above mesocoxae, and perpendicular anteriorly. Other differences include characteristics typically found in Ischnocnemis , such as finely punctate, vaguely pubescent basal antennomeres, more elongate body form, elongate metatarsomere I compared to tarsomeres II and III combined ( Fig. 345 ), and retracted mandibles with angulated base ( Fig. 337 ). Zalophia auricomis is comparatively stouter in body form, basal antennomeres are short and densely clothed with pubescence ( Fig. 66 ), and the first tarsomeres of metatarsi are explanate and subequal to tarsomeres II and III combined ( Fig. 64 ).