igii.] G. RiCARDO : Rcvisioji of the species of Tabanus. 203 



former lineal, very narrow, very slightly dilated below; beard short 

 and scant}^, black, as are the palpi; the whole body dark black, 

 abdomen a little shining. Wings black, with a long appendix, the 

 first posterior cell closed with a long stalk. Kyes naked. One 

 specimen from Laos, Bigot, I.e., p. 204. 



From vSiam, not Island Laos as given in Kertesz Catalogue. 

 Not known to me. 



Tabanus caerulescens, 9 , Macq. 



Dipt, exot., i (i), p. 132 (1838). 



Black. Antennae testaceous. Thorax with lateral testaceous 

 stripes. Abdomen bluish black. Legs black. Wings brown. 

 Length 8 lines. 5 . 



Palpi and face black with scanty gre}' tomentum. Forehead 

 at the base transversely furrowed, reddish grey, then blackish with 

 a shining black spot club-shaped. Antennae brownish testaceous. 

 Thorax black, with scanty gre}^ tomentum: a lateral dull testa- 

 ceous stripe above and in front of the wings. Abdomen black 

 with blue reflections. Legs black ; anterior femora hairy above ; 

 anterior and intermediate tibiae blackish brown, with scanty whit- 

 ish tomentum. Squamae and halter es brown. Wings brown, 

 less dark on the anterior border, the centre of the largest cells 

 hyaline. Neuration normal. From Java Museum, Macq.. Dipt, 

 exot., i (i), p. 132. 



Type in Paris Museum seen by me. A black species with the 

 wings tinged brown. Forehead very narrow anteriorly, a little wider 

 at the vertex, the frontal callus narrow, with linear extension. 

 Palpi stout, ending in a point with thick black pubescence. An- 

 tennae (incom])lete) reddish. Thorax black, red on the basal part. 

 Abdomen black. Legs blackish, the posterior tibiae reddish. 

 Length 18 mm. No specimens of this species occur in the collec- 

 tions mentioned in this paper. 



Tabanus tenebrosus, 9 , Walker. 



List Dipt., V, vSuppl. i, pp. 242, 389 (1854). 



Type 9 from Kanara, Malabar, and another female with the 

 name on it but no locality. 



Tabantis obscuratus, Walker, from Celebes is nearly related to 

 this species, but has a 'onger nar'-ower frontal callus, and the ab- 

 domen with no sign of the greyish blue tomentum 



From Tabanus caerulescens, Macq., it may be distinguished 

 by the dull obscure colour of its abdomen, face not black, legs 

 with no white pubescence. 



A dull reddish brown s])ecies with a narrow abdomen, narrow 

 forehead and frontal callus, blackish palpi; reddish yellow antennae 

 and blackish legs. Wings brown, ])aler on posterior border and 

 at extreme apex. Length 18 mm. 



