Scatopse guamensis, Johannsen, 1946

Johannse, O. A., 1946, Some New Species Of Nemocerous Diptera From Guam, Insects of Guam II, Honolulu, Hawaii: Bernice P. Bishop Museum, pp. 187-193 : 187

1. Scatopse guamensis , new species (fig. 1, a-e).

Male and female: black, including antennae, halteres, and legs except the tarsi which are yellow. Dorsum of thorax and abdomen dull, almost velvety, pleura and venter more or less shiny. Antennae of the male about half again as long as the transverse diameter of the head, the terminal segment a half longer than wide, the others transverse. Antennae of the female a little longer, the terminal segment about twice as long as wide. Thorax with short, suberect pubescence. Hind basitarsus twice as long as the second segment. Abdomen depressed, widest just beyond the middle. Terminalia of the male usually retracted (extended in fig. 1, c), the claspers broadened apically, tapering toward the base (fig. 1, b), mesosome about as long as broad (fig. 1, d). Terminalia of the female (fig. 1, e) with a pair of prominent cerci, the last two sternites of characteristic shape; the anal segment somewhat extended in the figure. Spermatheca single, spherical, sclerotized. Wing (fig. 1, a) hyaline, anterior veins dark, posterior veins colorless, mi~rotrichia dense, coarse, and uniformly distributed. Venation as figured; the second cubital vein strongly curved as in the S. fuscipes group; second costal division a fourth shorter than the first. Length of body 1.5 mm.; of wing, measured from the humeral crossvein, 1.2 mm.

Piti , July 21 ; Sumay, June 22, Swezey. Holotype and allotype in the Cornell University collection; paratypes in the collections of Cornell University and the Experiment Station, Hawaiian Sugar Planters' Association .

This species differs from Scatopse fuscipes Meigen in having the first cubital vein extending to the wing margin and in the form of the median fork. S. fuscipes is the genotype of Enderlein's genus Rhaeboza, which is distinguished from Reichertella by the strongly curved second cubital vein. Scatopse, as interpreted here (following Edwards, 1925, and Duda, i 934), includes species both with and without the spur at the base of the anterior branch of the media, thus embracing both Scatopse sensu stricto and Reichertella. The character upon which Rhaeboza is based scarcely warrants generic rank. The nomenclature of wing venation followed here is that of Comstock and not of Edwards (Ann. Applied Biology 12:271, 1925).