430 C. R. OSTEN SACKEN'S PRODROME 



4G. ^ 



f Crossvelns and bifurcation of third vein with distinct brown clouds; lateral whitish spots on abdomi- 

 nal segments distinct 47. lasiophthalmus Macq. 



Crossveins and bifurcation of third vein not clouded ; lateral whitish or yellowish spots on abdominal 



segments indistinct , 47. 



J 17-20 mm. long. Second joint of palpi narrow 48. aifinis Kirby. 



15-16 mm. long. Second joint of palpi stout at base 49. socius n. sp. 



The lateral whitish spots on .abdomen do not ^ touch the hind margins of segments 49. 



■ ^ The lateral whitish spots on abdomen rest with their broad base on the hind margins of segments . 50 

 'Third antennal joint rather narrow, and hardly excised at all; crossveins and bifurcation of third vein 



without any clouds 50. septemtiionalis Loew^ 



I Third antenn.al joint moderately broad and clistinctly excised; crossveins and bifurcation of third vein 

 [ with faint brown clouds 51. illotus n. sp. 



{Second joint of p.alpi stout at base 51. 

 Second joint of palpi narrow and rather long 53. astutUS n. sp. 



'Bifurcation of third vein without any vestige of a cloud; third antennal joint remai-kably narrow, not 



excised; subcallus not denuded (eastern species) 52. microcephalus n. sp. 



Bifurcation of third vein with a faint vestige of a brown cloud ; third antennal joint, although narrow, 

 I still with a distinctly projecting upper angle ; subcallus denuded, black, shining (western s]iecies) 

 L 54. rhombicus n. sp. 



49. ^ 



50. 



51.^ 



DESCRIPTION OF THE SPECIES. 



A. Tabani with glabrous eyes, and without ocellar tubercle. 



1. Tabanus turbidus. 



Tithanus turbidus Wiedemann, Auss. Zw., I, p. 124, 20. 



Female. Palpi reddish, with minute l^lack hairs ; face 3'ellowish gray, antennce fer- 

 ruginous; upper angle of the third joint sharp, projecting, but not drawn out in a point ; 

 annulate portion of the third joint rather long, but little shorter than the body of the joiirt, 

 the single jonits composing it very well marked ; front yellowish gray, distinctly narrowed 

 anteriorly, darker brown in the middle ; frontal callus brownish red, fully twice as long as 

 it is broad ; above it a smooth stripe of the sanie color (sometimes bifurcate at its upper 

 end). Thorax with a grayish pollen, forming more or less distinct longitudinal stripes ; 

 the reddish brown or brownish red ground color is distinctly visible between them ; scutel- 

 lum concolorous with the thorax, and also covered with a grayish pollen ; pleurae uniformly 

 dull whitish yellow. Abdomen brownish, with a white spot in the middle of the first seg- 

 ment and Avith large triangular spots of the same color on segments 2-6 ; these spots do 

 not differ much in size, that on the sixth segment alone being smaller ; the whitish borders 

 on the hind margins of the segments are rather naiTow, but expand laterally. Venter 

 brownish red, with whitish incisures. Legs brownish red, hind tibia? with a but little con- 

 spicuous fringe of black hair. All wing veins (longitudinal as well as crossveins) are 

 broadly margined on both sides with brown clouds, the interior of the cells remaining sub- 

 hyaline ; posterior margin of the wings also faintly margined with brown ; first posterior 

 cell broadly open. Length, 20-22 mm. 



Hah. Georgia (J. Ridings) ; Kentucky (Wied.). Four females. Will be easily recog- 

 nized by the peculiar coloring of its wings, the very long and comparatively narrow red- 



1 See the foot-note on page 427; in T. iUolus the whitish reaching tiie hind margin, as the white pubescence, covering 

 spots on the second segment often have the appearance of them in well preserved specimens, extends to tliat margin. 



