Trissolcus tersus Le Figures 189-190, 191-193

Trissolcus tersus Lê, 1985: 166 (original description); Johnson, 1992: 638 (cataloged, type information); Lê, 2000: 312, 320 (description, keyed, type information).

Description.

Female body length: 0.99-0.81 mm (n=2). Body color: head, mesosoma, and metasoma black.

Head. Color of radicle: yellow. Length of radicle: less than width of clypeus. Color of A1-A6 in female: basal A1 and distal A2 yellow, elsewhere pale brown. Color of A7-A11 in female: dark brown. Number of basiconic sensilla on A6: 0. Number of basiconic sensilla on A7: 2. Facial striae: present as elongate striation. Number of clypeal setae: 6. Microsculpture on gena directly above mandibular condyle: present. Shape of ventral gena in lateral view: narrow. Genal carina: present only at base of mandible. Malar striae: present. Sculpture of malar sulcus: smooth. Orbital furrow: medially delimited by ridge or carina at midpoint of eye, poorly defined or absent near intersection with malar sulcus. Macrosculpture of frons between antennal scrobe and anterior ocellus: absent. Preocellar pit: absent. Setation of lateral frons: moderately dense. Punctation of lateral frons: absent. Sculpture directly ventral to preocellar pit: microsculptured. Macrosculpture of lateral frons: absent. OOL: lateral ocellus and eye without continuous scleritic separation. Hyperoccipital carina: complete. Anterior margin of occipital carina: simple.

Mesosoma. Epomial carina: absent. Macrosculpture of lateral pronotum directly anterior to netrion: finely rugulose. Netrion sulcus: complete. Pronotal suprahumeral sulcus in posterior half of pronotum: undifferentiated from sculpture of dorsal pronotum. Posterior pronotal sulcus: absent. Number of episternal foveae: 3. Course of episternal foveae ventrally: distinctly separate from postacetabular sulcus. Course of episternal foveae dorsally: extending to mesopleural pit. Subacropleural sulcus: present. Speculum: weakly transversely wrinkled. Mesopleural pit: simple. Mesopleural carina: complete. Sculpture of femoral depression: smooth. Patch of striae at posteroventral end of femoral depression: absent. Setal patch at posteroventral end of femoral depression: present. Microsculpture of anteroventral mesopleuron: present throughout. Macrosculpture of anteroventral mesopleuron: absent. Postacetabular sulcus: formed by large cells. Mesopleural epicoxal sulcus: formed by open crenulae. Setation of posteroventral metapleuron: present. Sculpture of dorsal metapleural area: smooth area large, surrounded by well defined sulci. Posterodorsal metapleural sulcus: present as line of foveae. Paracoxal sulcus in ventral half of metapleuron: indistinguishable from sculpture to absent. Anteroventral extension of metapleuron: extending to base of mesocoxa. Metapleural epicoxal sulcus: absent or indistinguishable from sculpture. Mesoscutal humeral sulcus: present as a simple furrow. Median mesoscutal carina: absent. Macrosculpture of mesoscutum: absent. Pattern of mesoscutal microsculpture: uniform throughout. Mesoscutal suprahumeral sulcus: comprised of cells. Length of mesoscutal suprahumeral sulcus: about half the length of anterolateral edge of mesoscutum. Parapsidal line: absent. Notaulus: absent. Median protuberance on anterior margin of mesoscutellum: absent. Shape of dorsal margin of anterior lobe of axillar crescent: round. Sculpture of anterior lobe of axillar crescent: dorsoventrally strigose. Area bounded by axillar crescent: smooth. Macrosculpture of mesoscutellum: absent. Microsculpture on mesoscutellum: present throughout. Median mesoscutellar carina: absent. Setation of posterior scutellar sulcus: present. Form of metascutellum: single row of cells. Metanotal trough: foveate, foveae occupying more than half of metanotal height. Metapostnotum: invaginated near lateral edge of metascutellum. Length of postmarginal vein: about 1.5 times as long as stigmal vein. Color of legs: coxae dark brown, legs elsewhere yellow. Anteromedial portion of metasomal depression: smooth.

Metasoma. Longitudinal striae on T1 posterior to basal costae: present. Number of sublateral setae (on one side): 0. Setation of laterotergite 1: absent. Longitudinal striation of T2: absent. Setation of T2: present in a transverse line posteriorly. Setation of laterotergite 2: absent.

Diagnosis.

Trissolcus tersus can be identified by the line of foveae along the dorsal margin of the mesopleural carina (Figures 189, 192), a character known to us so only from this species. The setation of the posteroventral metapleuron (Figure 189) and the presence of facial and malar striae (Figure 193) are also useful for its identification.

Link to distribution map.

http://hol.osu.edu/map-full.html?id=3318

Material examined.

Holotype, female: VIETNAM: Hoa Binh Prov., rice field, Thuong Tien, 11.XI.1978, IEBR 0043 (deposited in IEBR) . Other material: (9 females) INDONESIA: 1 female, CNC424618 (CNCI). THAILAND: 7 females, CNC424502-424505, CNC424607, CNC424619 (CNCI); EMBT ENT 0001839 (USNM).