BY E. \y. FERGUSON AND G. P. HILL. 259 



along the posterior margin of the fourth and sometimes of the third segment to 

 connect up with- the median spot, segments 5 — 7 entirely black. 



Venter black, with the posterior margins of the second, third, and fourth 

 segments distinctly banded with light grey. 



Legs as in typical speciniens. 



Wings as in typical specimens, except that the black colouration is more 

 intense. 



Dimensions: Long, 15 mm.; wing's, 14.5 mm.; width of head, 5.75 mm.; 

 width of frons, 0.5 mm. 



ilafe.— North Queensland: Magnetic Island (Hill No. 1358). 



A name has been attached to the variety as, though the typical species is 

 variable in colouration, all the specimens from Magnetic Island are remarkably 

 constant in this respect. The type specimen of the variety is in the collection 

 of the Australian Institute of Tropical Medicine. 



Messrs. Paskin Bros., to whom we are indebted for the specimens we have 

 had for examination, informed us that these flies, and T. avidus Bigot, appeared 

 in gTeat numbers after heavy rain about the middle of September and for some 

 weeks after their attacks upon man and horses seriously interfered with opera- 

 tions on the farm. Their numbers decreased gradually until the last week in 

 November, when one of us visited the island to find only one fly during several 

 days collecting. During the following year (1921) this species was very scarce 

 indeed in the same locality. 



Tabanus wentwoethi, u.sp. 



A moderate-sized dark species allied to T. alternatus and T. dodcU. 



2. Face dark, clothed with slaty-gTey tomentum and with sparse dark 

 pubescence; cheeks and subcallus with more yellowish-gTey tomentum, the cheeks 

 with somewhat denser dark pubescence. Beard white, rather iscanty. Palpi 

 j'ellow, somewhat infuscate; second joint moderately long, comparatively slender, 

 somewhat thicker at base and moderately curved, ending in a straight obtuse 

 point; clothed with dark pubescence. Antennae black, with black hairs on fli'st 

 and second joints; first joint not concealing second, third joint with distinct 

 tooth at base, and moderately long annulate portion. Forehead comparatively 

 narrow, clothed with greyish-yellow tomentum and scanty dark pubescence; 

 callus large, elongate pear-shaped, not reaching eyes, with a long extension 

 almost to vertex. Eyes bare. 



Thorax black with narrow pale submedian and lateral lines only distinct 

 in anterior portion; pubescence dark, a few pale hairs present posteriorly; 

 pleurae clothed with grey tomentum, and rather sparse dark pubescence, pale 

 posteriorly. Sciitellum black, with a rather sparse fringe of pale straw-coloured 

 hairs. Abdomen black, portion of first and second segments feebly diluted with 

 brown; clothed with black pubescence, with a median line of transverse spots 

 clothed with whitish hairs on the posterior margins of the first to 'fifth seginents, 

 and a similar line on each side at lateral margins. Venter dark brown with 

 lighter segmentations, clothed with black pubescence with traces of lighter on 

 the segmentations. Leg's dark; femora black, tibiae reddish-brown, the anterior 

 dark on apical two-thirds; tarsi infuscate. Wings dark gTey, suffused with 

 brown along the course of both longitudinal and transverse veins, the suffusion 

 most marked in the region of the discal cell; stigma small, elongate, dark brown; 

 no appendix present. 



c?. Similar to ? in general appearance. Face and cheeks clothed with 



