GEEANOMYIA. 391 



base of 5th vein, with a less distinct one just above this latter spot. 

 The cross-veins show a tendency to just perceptible suffusion. 

 Halteres yellowish. 



Length 4|-6 inillim. 



Described from several of both sexes in the Indian Museum, 

 which demonstrate its apparent general distribution in Lower 

 Bengal, the series comprising specimens from Sonarpur, near 

 Calcutta, 5. ii. 10, "at light" in a railway carriage, taken by 

 Dr. Annandale (type <$ ) ; Sorabkatti, 7. xii. 09 (type $ ) and 

 14. xii. 09; Bosondhur, 21. viii. 09 ; Chennia, 11. xi. 09; Sonadigee, 

 6. xii. 09 ; and Bologhatta, 23. viii. 09, all these places being in the 

 Ganges delta, the specimens having been taken " at light " on 

 board a launch by Dr. J. T. Jenkins. Other examples in the 

 Museum collection are from Port Canning, 6. xii. 07 ; Calcutta, 

 18. ix. 07 ; on board ship 10 miles off Masulipatam, Madras Coast, 

 4-5. iv. 08 (Paiva) ; and Puri, Orissa, Coast, 12. xi. 10, in house 

 (Annandale). 



Types in the Indian Museum. 



The very conspicuous circle of spots on the thorax, together 

 with the very delicately punctated wings, render this species very 

 distinct even in the whole family of 



281. Geranomyia tridens, sp. nov. (PI. VIII. fig. 4; PI. XI, 

 figs. 4, 5.) 



<S $ . Head : occiput dark grey, with a few isolated rather con- 

 spicuous bristly hairs; back of head yellow ; neck brownish yellow, 

 with a small dark transverse streak about the middle ; eyes nearly 

 contiguous. Antennae dark brown ; in male, the joints distinctly 

 separated, elongated pear-shaped, the narrow apical part much 

 attenuated, each joint with a circlet of four long bristles in 

 addition to the ordinary short pubescence ; in female, the joints 

 much less distinct, scape broad, 1st joint sometimes with a trans- 

 verse suture near base making it appear like two joints ; flagellurn 

 with light grey pubescence. Proboscis of considerable length, as 

 long as from the base of the antennae to the halteres, stout at the 

 base only, brownish yellow or yellow, with a few long hairs on the 

 basal half and very minute ones on the thin apical half; the small, 

 brown two-jointed palpi situated at the tip of the basal part. 

 Thorax yellowish, with very distinctive and conspicuous markings ; 

 dorsum with a broad brown median stripe from anterior margin 

 to the suture, somewhat indistinct about its middle ; practically 

 the whole of the dorsum behind the suture occupied by two very 

 large dark brown shining spots divided by the usual wide yellowish 

 depression ; on each shoulder a very dark blackish-brown moderate- 

 sized spot, and posterior to this a large trident-shaped blackish- 

 brown spot, the three prongs (approximately parallel) pointing 

 backwards, the spot occupying the whole of the side of the thorax 

 up to the wing-base. Sides of thorax yellowish ; plurse moderately 

 shining brown ; scutellum and metanotum shining dark brown, 



