Dacus ochrosiae, 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 : 201-202

Dacus ochrosiae , new species.

Male and female. Close to D. distinctus Malloch, readily distinguished by lack of black spots on face, undivided central gray-dusted mesonotal vitta, lack of a yellow notopleural spot, more extensively blackened scutellum, brown posterior basal cell of wing, and break in costal border at hind margin of discal fascia.

Head yellow, frons more or less extensively brown centrally, occiput with a small subquadrate brown mark above neck, no black spots on face, a brown spot below eye; antennae brownish yellow, third segment almost entirely dark brown, narrowly reddish at base; palpi brownish yellow. All bristles black. Frons about twice as long as wide, with one pair of reclinate upper and two pairs of incurved lower bristles on orbits; the four vertical bristles strong; ocellars microscopic; postverticals lacking. Antennae about as long as face. Face slightly humped in center. Thorax shiny black, mesonotum with a complete central rather broad uniform vitta of gray dust that fills the space between prescutellar acrostichals, a yellow sublateral vitta from suture to near hind margin, and humeri yellow, no other yellow marks on mesonotum. Upper margin of mesopleura with a yellow stripe that is widened behind to about one third the height of sclerite; scutellum with a yellow margin, black on disk and below; metapleural spot above and below stricture. Bristles as follows: no humeral, 2 notopleurals, 1 supra-alar, 2 postalars, 2 acrostichals, 1 mesopleural, 1 weak pteropleural, 2 scutellars, and 4 scapulars of variable length. Legs fulvous yellow, hind tibia and apices of tarsi somewhat browned. Wings hyaline, with a broad brown costal streak that extends across wing to the fourth vein from opposite the humeral cross vein, is interrupted at apex of first vein, and from beyond this rather narrow break extends to wing tip, covering the wing surface from costal margin to over third vein, and at tip touching apex of fourth vein. From this costal streak there are two oblique dark brown fasciae, one over the posterior basal cell that almost fills it and extends over anal cell to wing margin, and the other extending from just before costal break to hind margin and covering both cross veins. The apical portion of the border has usually a short projection on its lower side at base representing apparently a rudimentary second discal fascia. Inner cross vein oblique, at less than its own length, and not one third the length of discal cell from apex of cell. Fifth vein bare. Abdomen black, with yellow apices to tergites, discal depressions on fifth tergite not very well marked. Length, 6-8 mm.

Fadian, Aug. 19, ex Ochrosia fruits, type male, allotype female and eight paratypes, Swezey; Ritidian Pt., Aug. 6, ex Ochrosia fruits, two paratypes, Swezey; Dededo, Sept. 7, ex Ochrosia fruits, one paratype, Swezey ; Guam, n0 other data, one paratype, Fullaway ; Yigo, Sept. 5, 1937, in field on fruits of Ximenia americana , U. S. National Museum , no. 153 b .

One reared female has the apical costal stripe reduced to streaks on the veins, the cells subhyaline centrally.