Trichiosomites obliviosus Brues, 1908

Figs. 24–25.

Trichiosomites obliviosus Brues, 1908 p. 260, Fig. 1.

Holotype. Holotype MCZ 2036, Brues (1908). A rather complete female with head present, but positioned under thorax (not missing as Brues 1908 presumed).

Diagnosis. As for genus.

Description. Holotype MCZ 2036 (Fig. 24), female. Body: head length 0.5 mm or slightly more, width 0.87 mm; thorax length ca. 2.5 mm; abdomen length ca. 5 mm; body colouration unknown by preservation. Forewing: length ca. 6.0 mm, estimated maximum width ca. 2.0 mm, length/width: ca. 3.0. UCM 4570 (Fig. 25), female. Body: length ca. 9.2 mm; head, antenna dark; thorax dark, wings including pterostigma light; abdomen light. Head difficult to interpret as preserved; moderately transverse, occiput long, three distinct ocelli in low triangle, compound eyes not preserved, sole funicular segment thin, slightly more than half length of club; club expands gradually over three segments (“drop-like”). Thoracic dorsum only partially visible as preserved, median longitudinal mesonotal sulcus and notauli present; mesopleuron with no mesopleural sulcus visible. Forewing: membrane hyaline, length ca. 6.5 mm; maximum width estimated ca. 2.5 mm, length/width: ca. 2.6; pterostigma wide, ca. as cell 2r; R+M shorter than 1-M; maximum length of cell 2r shorter than 3r; 2r-rs longer than Rs between 2r-m, 2r-rs, joining Rs near middle of cell 3rm; 2r-rm straight, short, joins M at 2m-cu; 1-M curved; cell 1mcu with M, 1m-cu sub-parallel; 3r-m straight; cell 2mcu with M slightly longer than 1m-cu; 2m-cu straight; cu-a postfurcal; anal cell separated by 1A fusion with 2A+3A (no crossvein) for length of about a third length of cell 2a. Abdomen: long, wide; ovipositor thick, not exceeding abdomen apex.

Material. Holotype and UCM 4570, a rather complete specimen missing only the legs and much of the hind wings.

Locality and age. Florissant Formation, Priabonian.