BY E. W. FERGUSON AND G. F. HILL. 



253 



slightly but definitely narrower than in T. neopalpalis, very feebly narrowed to 

 vertex, with sparse pubescence mostly pale; callus apparently absent in type, 

 an ' inconspieuxjus hardly elevated laevigate area in this position in another 

 specimen, possibly due to abrasion. Eyes bare. 



Thorax as in T. neopalpaUs with rather sparse golden decumbent pubescence. 



Abdomen as in T. neopalpaUs, apical segments somewhat darker; mainly 

 with black pubescence with some golden pubescence in midline and at sides of 

 segments. 



Leg's as in T. neopalpalis. 



Wings with anterior border pale yellow, stigma inconspicuous, appendix 

 present. 



Text-figs. 1,2. — Silvius eguhms , -D..s^. 1. Head, frontal view . 2. Antenna. 

 Text-fig. 3. — Tabanus pseudocallosus, n.sp. Antenna. 

 Text-fig. 4. — Tabanus breinli, n.sp. Antenna. 



Text-figs. 5,6. — Tabanus palmensis , n.sp. 5. Antenna : 6. Head, frontal view. 

 (AU figures drawn from types) . 



Dimensions : Long, 8 mm. ; wing, 9 mm. ; width of head, 3.5 mm. ; width of 

 frons at widest part, 0.45 mm. 



Ho&.— N. Territory: Batchelor (Hill No. 1405). Type in Coll. Hill; para- 

 types in Coll. Aust. Institute of Tropical Medicine and Dept. of Public Health, 

 Sydney. We have hesitated before describing this species as new on account 

 of the great resemblance to T. neopalpalis from the same locality. The differences 

 might conceivably be due to variation within the one species, but it seems un- 

 likely that there should be variation in four different characters, such as there 



