Tachyta (Tachyta) gilloglyi Erwin 1975

Tachyta gilloglyi

TYPE-LOCALITY.—Tiger Lake Area, Cam Rahn Bay, Republic of South Viet Nam.

TYPE-SPECIMENS.—The holotype male and allotype are in USNM. Both were collected by A. R. Gillogly in 1970. Two paratypes from the same locality, collected by W. H. Tyson are in USNM.

DIAGNOSIS.—The elytral chaetotaxy (E 6 in position b, and Ed 3 located anterior of seta Eo 4), broadly transverse “false” meshes of the elytral microreticulation, and subconvex elytral intervals are distinctive in the genus.

DESCRIPTION.—Form (Figure 31): Narrower than members of T. umbrosa and with more attenuated elytra.

Color: Shiny rufous throughout, apex of elytra slightly paler; appendages flavotestaceous.

Head (Figure 45): Narrower across eyes than in T. umbrosa members although still equal across eyes to width of pronotum across anterior angles; frontal furrows shallow, less impressed on clypeus than in T. umbrosa members; front between eyes finely and sparsely punctulate, punctulae not grouped into transverse band; eyes very prominent. Mouthparts (Figure 44) with mentum more truncate anteriorly and more excavate ventrally than in T. umbrosa members.

Pronotum (Figure 46): Transverse, less so than in members of T. umbrosa and with disc less depressed at middle, sides less abruptly sinuate posteriorly; laterobasal carina (Figure 46) more developed and longer than in T. umbrosa members; hind angles almost 90°; basal transverse impression well engraved laterally, narrowly interrupted medially, less so than in T. umbrosa; anterior angles more prominent than in T. umbrosa members.

Elytra (Figure 47): As in T. umbrosa except interneurs more deeply striate and punctulate, especially the seventh, and intervals more convex; seta Ed 3 located anterior of Eo 4.

Microsculpture (Figures 49–51): Very similar to that of T. umbrosa members but with less tendency to form meshes, especially on pronotum and elytra, i.e., the engraved lines do not actually connect in most cases but give the impression of a mesh when viewed with light microscopes.

Genitalia: Male (Figure 34) median lobe shorter and slightly more arcuate than in males of T. umbrosa, yet with internal sac more elongate and apically attenuate, also very lightly pigmented (1 examined); female as in T. falli (1 examined).

Size: Length, 2.48 to 2.66 mm; width, 1.06 to 1.14 mm, 3 specimens measured.

VARIATION.—The small sample available is quite homogeneous.

NATURAL HISTORY.—All four specimens seen were collected under bark (host species unnamed) in June and the specimens are not teneral. The type-locality is at sea level.

DISTRIBUTION (Figure 43).—This species is known only from the type-locality.