Descriptions of four new Dipterous Insects. 59 



VII. Descriptions of four new Dipterous Insects from Cen- 

 tral and Northern India. By W. W. Saunders, Esq., 

 F.L.S. &c. 



[Read 2 December, 1839.] 



Family TABANID^. 

 New Genus. Gastroxides. 

 Head transverse, with three ocelli placed in an equilateral tri- 

 angle on the vertex ; proboscis straight, inclined downwards, about 

 as long as the head. Antennce rather longer than the head, three- 

 jointed — first joint cylindrical, twice as long as the second, which 

 is longer than broad — third joint a little longer than the two 

 first, with four distinct rings dividing the joint into five divi- 

 sions, the first of which is as long as the four following, and pro- 

 duced at the base on the superior part into an acute spine point- 

 ing forwards — the four last divisions equal in length. Thorax 

 oval, rather broader than the head. Abdomen seven-jointed, ovato- 

 conical, terminating in an acute point. Legs long and slender. 



Gastroxides ater, mihi. (Plate V. fig. 4.) 

 Coal black, hairy ; the wings of a black-brown, with a yellow- 

 ish irregularly oval spot crossing the middle of the disk, and a 

 smaller spot of the same nature towards the apex. Expansion 

 one inch, length § inch. 



From central India. In my own collection. 

 Obs. — This genus approaches nearest to Tahanus, but differs 

 in having ocelli, in the antennae, and in the shape of the abdomen. 

 Its approach to other genera of the family Tabanidce is also evi- 

 dent, but it differs from all the genera that I am acquainted with, 

 and therefere I have made it the type of a new sub-genus under 

 the name of Gastroxides, in allusion to the shape of the abdomen, 

 which is unusual in the family to which the insect belongs. 



[Fig. 4 a, head sideways ; 4 b, antenna ; 4 c, wing.] 



Family ANTHRACID^. 



Anthrax mficollis, mihi. (Plate V. fig. 5.) 

 Dull black, hairy, with a rufous margin of hairs on the anterior 

 part of the thorax, and two large round pure white spots, one on 

 either side of the third joint of the abdomen ; wings hyaline, with 

 the base black, and a broad black band running nearly across the 

 middle of the disk, which on the anterior margin is produced into 



