Orthotylellus brunnescens, 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 : 81-82

77. Orthotylellus brunnescens , new species.

Elongate-oval, brown, with conspicuous, short, appressed, silvery hairs intermixed with the longer, fine, subappressed pubescence.

Head about three fourths as long as broad, produced about three fourths as far in front of eyes as length of eye, 7: 9, in the male, and nearly as far as length of an eye, 8: 9, in the female. Eyes half as wide as interocular space in the male, scarcely more than one third as wide as interocular space in the female, 5: 14. Disk relatively smooth, polished and moderately elevated, the hind margin almost imperceptibly transversely impressed subbasally. Pubescence of disk sparse and somewhat irregular, of the two types mentioned above. Rostrum reaching about to middle of fifth visible abdominal segment in the male and considerably exceeding the apices of hind trochanters in the female. Antennae over twice as long as width of pronotum, 67: 31, in the male, 64: 31 in the female, second segment distinctly longer than width of head in the male, 27:24, slightly shorter than width of head in the female, 23: 24; proportion of segments in the male, 7: 27: 18: 15, in the female, 7: 23: 17: 16.

Pronotum about two thirds- as long as head, over twice as broad as long, 31: 13. Disk very faintly transversely rugose, shining, with rather regular, fine, subappressed hairs and sparse, appressed, silvery hairs as on scutellum and hemelytra.

Color rather uniformly brown with very obscure transverse darker stripes on head, and with paler anterior margin of pronotum, apex of scutellum, lateral portions of coria broadly, cuneal fracture and apex of cuneus. Membrane generally clouded, the veins pale. Antennae brown, the second segment broadly pale at middle. Rostrum pale with black apex. Legs fulvous or paler with brown bases of coxae, hind femora except at apices, and infuscated apices of tarsi. Under surface brown except for pale margins of thoracic pleurites and pale ostiolar area.

Size: male, length 2 mm., width (hemelytra) 0.85 mm.; female, length 2.1 mm., width (hemelytra) 1 mm.

Holotype male, allotype female, and seven paratypes, Piti , June 20, on Scleria margaritifera, Usinger ; one paratype, 5 miles south of Piti , June 23, Usinger ; two paratypes, Inarajan , May 7, Usinger , May 7, on rice, Swezey; two specimens, Guam, Fullaway (1203).

Quite distinct in general appearance from pallescens and rufescens because of the dark color and conspicuous silvery pubescence. This is very close to, if not identical with, a series of specimens which I collected at Montalban, Luzon, Philippine Islands, July 14, 1936 and differs only slightly from a single specimen which I collected at Los Banos on July 17.