. Bulletin. Natural history; Natural history. April 1983 Pec:human, Webb, & Teskkv: Diitera of Illinois—Tabanidae 59 This genus is based on one rarely collected species. Small size ( mm); frontal callus large, oval, dark brown; frontoclypeus yellow with dark, spot on each side and triangular area of pollen below an- tennae; antennae slender and elongate; thorax yellow with three shining black stripes, center one extending onto scutellum; wing (Fig. 74) rather uni- formly infuscated with spur on an in- dication of one at bifurcation of third longitudinal vein; abdomen yellow, globose, wi
. Bulletin. Natural history; Natural history. April 1983 Pec:human, Webb, & Teskkv: Diitera of Illinois—Tabanidae 59 This genus is based on one rarely collected species. Small size ( mm); frontal callus large, oval, dark brown; frontoclypeus yellow with dark, spot on each side and triangular area of pollen below an- tennae; antennae slender and elongate; thorax yellow with three shining black stripes, center one extending onto scutellum; wing (Fig. 74) rather uni- formly infuscated with spur on an in- dication of one at bifurcation of third longitudinal vein; abdomen yellow, globose, wider than thorax, with dou- ble row of large black spots on tergites 1—5 with stiff black hairs laterally, espe- cially heavy on segments 3 and 4. Male holoptic, closely resembles female; ab- domen less globose, scarcely wider than thorax; frontoclypeus with yellow polli- nose stripe reaching half way to oral margin. The male has previously been unknown, but the only specimen seen from Illinois was a male. The globose abdomen and other characters mentioned here and in the key to genera distinguish this species from any other Illinois tabanid. The immature stages are unknown, and little is known about the habits of this species. In Illinois adults have been collect- ed only in early June. N. globosus is a rare species, collected mosdy as single specimens in Maryland, Delaware, Alabama, Mississippi, Ten- nessee, and Illinois (Fig. 151). Illinois records.—Pulaski County, Wetaug. Diachlorus Osten Sacken Diachlorus ferrugatus (Fabricius) Chrysops feiTugatus Fabricius (1805: 111). Type-locality: Carolina. Tabanus americanus Palisot de Beauvois (1819:222). Type-locality: United States. Name preoccupied (Forster 1771). Diabasis ataenia Macquart (1838:156). Type-locality: Carolina. Chrysops approximans Walker (1848:198). Type-locality: Florida. Chrysops convergens Walker (1848:198). Type-locality: Honduras. Tabanus rondanii Bellardi (1859:68). Type-locality: Mexico. Moderate size (
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