Rhabdochaeta guamae, Malloch, 1942

Mailoch, J. R., 1942, Trypetidae, Otitidae, Helomyzidae, And Clusiidae of Guam (Diptera), Insects of Guam I, Honolulu, Hawaii: Bernice P. Bishop Museum, pp. 201-210 : 204-205

Rhabdochaeta guamae , new species ( fig. 2 , a, b).

Male. A characteristic species of the genus, distinguished from its allies by wing markings. In figure 2 , a, the bullae are not shown. They are merely slightly elevated spots a little more elevated and more shiny on the upper surface than the surrounding membrane, three in number, located as follows: one on each side of the outer cross vein against the fourth vein, and the third above the outer extremity of the black spot beyond the inner cross vein. The third and first veins are setulose above.

Head testaceous yellow, with whitish dust, vertex gray, occiput with a pair of black spots connected above neck, gray dusted. Antennae yellow, aristae yellow at base, whitish beyond; palpi pale testaceous yellow, with quite dense short stiff black hairs along sides. A small black spot between each antenna! base and eye. Profile as in figure 2 , b. Inner vertical and two intermediate orbital bristles dark brown, anterior infraorbital, two upper reclinate supraorbital, ocellar, outer vertical, postvertical, and interfrontal bristles, and most postocular setulae white. Frans about half the head width, almost quadrate, orbits linear, widened below. A strong pair of bristles on interfrontal stripe about midway between anterior ocellus and lunule, three incurved white bristles behind each inner vertical bristle. Third antenna! segment tapered to apex; aristae pubescent. Thorax testaceous yellow, disk on mesonotum and scutellum, postnotum and marks on pleural sclerites black, with dense pale gray dust. Bristles luteous, dark brown at extreme bases, all mesonotal hairs and most of those on pleura except a few on mesopleura and all the short pleural bristles, white. Bristles as follows: 1 humeral, 1 presutural, 2 notopleural, 1 supra-alar, 2 postalar, 2 pairs of dorsocentrals, anterior pair at suture, and 4 scutellars, apical pair minute; all pleural bristles short. Legs yellow, hind tibia with a dark brown annulus near base opposite a similarly colored mark on ventral surface of hind femora. No exceptional armature nor structures present. Wings whitish hyaline, with yellowish brown markings as shown in figure 2 , a; usual deep black spots above outer cross vein, and fourth vein bent upward just beyond outer cross vein as in the other species. Halteres yellow. Abdomen short ovate, testaceous yellow, largely blackened and entirely gray dusted on dorsum; hairs and bristles white. Length, 2.75 mm.

Guam, no other data, Fullaway , type .

Figures

FIGURE 2.-Rhabdochaeta guamae: a, wing; b, head.