provided by Catalog of Hymenoptera in America North of Mexico
Kans., Nebr., Mont., Idaho, Ariz.
bibliographic citation
Catalog of Hymenoptera in America North of Mexico. 1979. Prepared cooperatively by specialists on the various groups of Hymenoptera under the direction of Karl V. Krombein and Paul D. Hurd, Jr., Smithsonian Institution, and David R. Smith and B. D. Burks, Systematic Entomology Laboratory, Insect Identification and Beneficial Insect Introduction Institute. Science and Education Administration, United States Department of Agriculture.

Comprehensive Description

provided by Smithsonian Contributions to Zoology
Scelio rufulus

From S. semirufus, new species, which it resembles superficially, this species differs in its very smooth lower frons, the relatively shorter first segment of the antennal flagellum, the better developed occipital carina, the different abdominal sculpture, and the usually entirely reddish body of the female (in S. semirufus the head and abdomen are black). Structurally S. rufulus is most similar to S. oedipodae Ashmead, from which it differs especially in color and in its unusually broad and bulging temples and cheeks.

FEMALE.—Length normally ranging from 4 to 4.3 mm. Head very slightly wider than thorax, in dorsal view about 1.65 times as broad as its maximum length, in front view subrectangular; temples and cheeks broadly rounded and bulging a little, the temples at mideye point at least 0.8 as wide as eyes and only weakly sculptured; malar space about two-thirds as long as eye height; shortest distance between eyes about 1.25 times as long as eye height; lower frons, malar spaces and cheeks smooth and shining, a few very short and very faint striae radiating from above bases on mandibles; upper part of frons, vertex, and occiput usually largely smooth but sometimes somewhat rugulose punctate; occipital carina well developed and usually complete; pedicel of antenna about as long as first and second flagellar segments combined, club a little more than three times as long as thick.

Neck of pronotum very weakly, irregularly roughened, shiny; pronotal shoulders a little rounded off, not rectangular; mesoscutum largely rugulose punctate but usually more or less smooth and shiny on the middle lobe anteriorly and on the small lateral lobes; notaulices indicated; disk of scutellum closely rugulose punctate; propodeum nearly horizontal, largely rugulose reticulate, without a transverse ridge setting off a posteriorly depressed area but usually with two subparallel median longitudinal carinae defining an elongate impressed area; posterior lateral angles of propodeum prominent and acute; the broad, oblique impression on mesopleuron strongly and completely transversely striate; mesopectus smooth and shining; subcosta apparently complete although hyaline and very weak apically; stigmal vein usually not distinct and at most represented by a faint hyaline stub; hind coxae smooth and polished above.

Abdomen at widest point usually slightly wider than thorax; first tergite medially less than half as long as second, coarsely longitudinally rugulose; second finely longitudinally rugulose striate; third largely minutely rugulose; fourth and fifth tergites usually shagreened or finely granulose; third and fourth tergites subequal in length, the fifth twice as broad at base as long, the sixth broadly triangular; third, fourth, and fifth sternites smooth and shining, at most vaguely longitudinally sculptured laterally.

Ferruginous, the abdomen sometimes slightly darker than head and thorax; legs and tegulae concolorous with thorax; forewings hyaline or faintly infumated on apical two-thirds.

MALE.—Differs from the female in the antennae (Figure 45), in having the upper frons, temples, and vertex more densely sculptured, and in having the head, thorax, and abdomen black; the coxae and femora also are black or blackish, and the wings are clear hyaline.


DISTRIBUTION.—Described from 13 females (one the holotype) and 3 males reared from eggs of an unknown grasshopper in Greeley County, Kansas. 21 October 1938, by F. L. McDonald; 2 females from grasshopper eggs, Russell County, Kansas, May 1938, R. W. Portman; and 8 females and 1 male from grasshopper eggs, Smith County, Kansas, 2 October 1938, R. W. Portman. Also belonging here, although not included in the type series are: 1 female from Halsey, Nebraska, taken 30 June 1958, by R. Henzlik; 1 female collected at Phoenix, Arizona, 27 May 1938; 2 females collected in wind vane traps in Idaho, 1 at Tuttle, 1 July 1932, and 1 at Wendell, 15 October 1930, and 1 female and 2 males from Winnett, Petroleum County, Montana, collected 30 July 1969, by A. G. Hamilton. In one of the female paratypes from Smith County, Kansas, the eyes are unusually small and the lateral ocelli are removed from the eyes by more than their own diameter.
bibliographic citation
Muesebeck, Carl F. W. 1972. "Nearctic species of Scelionidae (Hymenoptera: Proctotrupoidea) that parasitize the eggs of grasshoppers." Smithsonian Contributions to Zoology. 1-33. https://doi.org/10.5479/si.00810282.122