igii.J G. RiCARDO : Revision of the species of Tabanus, 113 



here to Macquart's Dipt. Exot. volumes the original pagination 

 is used, unfortunately in some of the reprints of the work from 

 Mem. Sci. Agri. et Arts de IJlle, 1838 — 1854, in which publication 

 the work first appeared, the original pagination has not been 

 adhered to, and in this incorrect form has been in general use. 

 As the descriptions b}^ Walker and Bigot are, as a rule, too poor for 

 identification of the species, it appears justifiable to delete from 

 the list of species of Tahanus &.ny types of either of these authors 

 which are now lost or destroyed. All types, except those of Bigot 

 and Macquart which are either in Mr. \'errairs possession, or in the 

 Paris Museum, or as in the case of ]\Iacquart in the Lille Museum, 

 are in the British Museum collection unless otherwise specified. 



There were about 119 described species oi Tahanus from the 

 Oriental Region, now reduced by synonyms, deletion from list or 

 not belonging to the Oriental Region to about j^ species, w^hich 

 with the addition of 40 new species described here (4 were pub- 

 lished first in the Annals) brings the total to 117 species, including 

 one species from Celebes, and 3 species from other Regions occur- 

 ring here. The table for species does not include those species of 

 which I have no knowledge, except in a few instances where the 

 descriptions allow of their being included \\\t\\ some certaint}'. 



The drawings in the two plates have been executed bj^ Miss 

 Grace Edwards. 



Table for Groups. 



I. Eyes bare . . . . . . II. 



Eyes hair}' {Thcrioplectes) .. .. Grottr XI. 91. 



II. Forehead with two separate calli, the first 



one usually transverse, the second irre- 

 gular in shape, smaller. Forehead four 

 to six times as long as it is broad. vSmall 

 species 9 — 14 mm. in length . . III. 



III. Thorax and scutellum same colour. Ab- 



domen with no bands .. .. Groitp I. I. 



Scutellum white or yellow-haired. Abdomen 

 with w4iite or yellow-haired bands 



IV. Forehead with two small round spot-like 



calli, one above the other, never united . . 



V. Forehead with no callus 



VI. Forehead with one square, narrow, or oblong 



callus, which is alvva3^s prolonged towards 

 the vertex by a more or less narrow line. . 



VII. Wings with s])ots or bands . . 

 Wings distinctly marked with brown or yellow 



colouring, but not in the form of bands. 

 Large species 18 — 2^, mm. in length 



