Orthotylellus rufescens, Usinger, 1946

Usinger, Robert L., 1946, Hemiptera Heteroptera of Guam, Insects of Guam II, Honolulu, Hawaii: Bernice P. Bishop Museum, Bulletin 189, pp. 11-103 : 79-80

75. Orthotylellus rufescens , new species.

Elongate-oval, rufescent with pale laterally on humeri and hemelytra, clothed above with rather fine subappressed hairs and a few shorter appressed hairs.

Head broader than long, 23: 19; anteocular portion nearly as long as an eye, 8: 9 in the male, equal to length of an eye in the female. Interocular space less than three times as wide as an eye in the male, 13: 5, three times as wide in the female, 15: 5. Upper surface moderately convex, rather smooth and shining with sparse concolorous erect hairs and a few short, appressed pale hairs. Vertex feebly but distinctly depressed just before hind margin of head, the hind margin feebly sinuate at middle. Rostrum reaching to middle of fifth visible abdominal segment in the male, the first segment reaching onto front coxae, somewhat shorter in the female but reaching well beyond apices of hind trochanters. Antennae about twice as long as width of pronotum, first segment rather short, reaching about to apex of head, second segment slightly longer than head across eyes, 25: 23; proportion of segments in the male, 6: 25: 15: 14, in the female, 6: 27: 16: 14.

Pronotum much shorter than the head, 13: 19, over twice as broad as long, 30: 13; disk rather smooth, the callosities scarcely elevated. Hind femora about three and one half times as long as thick.

Color reddish brown with paler bucculae and gula, and with ochraceous humeral angles, outer margin of clavus at least basally, corium broadly basally and laterally and cuneus laterally, the upper surface thus appearing rufescent medially and broadly pale laterally. Membrane clouded, especially medially, the veins reddish. First antenna! segment reddish brown, the remaining segments pale. Rostrum pale with black apex. Front legs including coxae entirely pale except for black apical halves of tarsi. Middle and hind legs pale in region of trochanters, on tibiae except for small reddish brown spots fro'in which the pale tibial bristles arise, and on tarsi except for dark apices. Elsewhere on coxae and most of femora reddish brown. Under surface broadly rufescent with pale abdominal margins.

Size: male, length 2 mm., width (hemelytra) 0.9 mm.; female, length 2.3 mm.; width (hemelytra) 1 mm.

Holotype male, allotype female, and 30 paratypes, Mt. Chachao , May 16, on a species of sedge taller than Rhynchospora corymbosa, Usinger.

0. rufescens differs from samoanus Knight in its shorter rostrum and different coloration, the sides of hemelytra not pale either in the typical form of samoanus or in the variety nigrellus . I have seen specimens of Orthotylellus from Cairns, Queensland.

A single male labeled " Fiji, 1905" appears to be identical with rufescens , though I cannot be certain of this without a series of better preserved specimens. A second specimen, from Rewa, Fiji, 1909, collected by Muir has the second antenna! segment half again as long as width of head and differs in type of pubescence and coloration.