rgii.] G. RicARDO : Revision of the species of Tabanus. 147 



the fourth posterior cell but the second submarginal cell is almost 

 wholly clear. The type is not in very good preservation but is too 

 distinct a species to be confused with others, though it is allied to 

 Tahanus joidus Bigot, in colour of wings and shape of antennae 

 and forehead; the palpi are however larger and broader, and the 

 wings have no appendix, the posterior cell open at border though 

 very narrow. 



Tabanus basalis, 9 , Macquart. 



Dipt, exot., i (i). p. 130 (1838); Van der Wulp, Notes 

 Leyden Museum, vii, p. 72, 26 (1885). 



Black. Scutellum and basal segments of the abdomen ferru- 

 ginous. Wings yellow at the base, brown at the apex. Length 8 

 lines. From East India. M. Marc. Museum. 



Face and forehead brown, this latter narrow, especially an- 

 teriorly, with a raised line and a small anterior callus, blackish. 

 Antennae brownish testaceous, the third joint elongated, wdth a 

 very short tooth, the last divisions brown. Thorax brown; sides, 

 outer border and scutellum pale ferruginous. Abdomen with the 

 first two segments pale ferruginous, transparent, with light whitish 

 reflections ; the others shining black. I^egs blackish ; tibiae yellow- 

 ish black at the apex. Wings on anterior half yellowish and pos- 

 teriorly of a light brown. Macq., Dipt, exot., i (i), p. 130. 



Two females from Sumatra (V. lyansberge). In the most 

 essential points the}^ agree with the description. There are how- 

 ever some disagreements to be mentioned. 



1st, According to the description the third and following seg- 

 ments of abdomen ought to be shining black ; in my specimens the 

 colour of these segments is fuscous and rather dull ; moreover the 

 livid margins of segments show remains of a white hair-fringe ; the 

 under surface is wholly fuscous and there the white fringe is com- 

 plete, even on the second segment. 



2nd. According to Macquart the legs are blackish, the tibiae 

 yellow with black tips ; this may be the truth in regard to the 

 front legs; in the posterior ones, however, I find the tibiae brown 

 and not darker at the end. 



This species may be easily recognised by the light brownish 

 yellow colour of the first two abdominal segments, on account 

 of which it resembles more or less the N. American Tahanus 

 cinctus, Fabr. The e3''es are bare, reddish bronze, without cross- 

 bands, even after having been moistened, and with very small 

 facets all over. V. der W^ulp, Notes Leyden Museum, vii. 

 p. 72. 



Type in Paris Museum seen by me, has the first posterior cell 

 of the wing closed, a fact not mentioned by Macquart or V. der 

 Wulp. 



The abdomen is elongated, the first two segments livid, the 

 remaining ones brownish black. vScutellum livid. Thorax brown, 

 livid at base. Wings tinged brown, clear at the extreme apex. 



