a Genus of Dipterous Insects. 3H 



tantfim sub nervo interno pauUo obscuriores sunt, pone medium fascia 

 hyalina irregularis basin versus arcuata exstat ; etiam ante apicem 

 alarum fascia altera fer^ recta hyalina apparet. Pedes fulvesceutes, fe- 

 moribus anticis in omnibus sequfe subincrassatis ; tibiis anticis piceis tar- 

 sisque subfuscis, femoribus 4 posticis acl apicem inermibus et obscuriori- 

 bus ; tibiis tarsisque etiam obscuris. 

 This beautiful species was collected in great numbers in India by Lieut.-Col. 



W. H. Sykes, F.R.S., &c., in honour of whom it has been suggested to me by 



Mr. G. R. Gray that it should be designated ; a suggestion which I have 



much pleasure in adopting. 



The former gentleman has kindly furnished me with the following notice 



respecting the habitat and habits of this species. 



"■^Habitat. The hill fort of Ilurreechunderghur in the western ghauts of the 

 Deccan, at an elevation of 3900 feet above the level of the sea. Lat. 

 19° 23' N., long. 73" 40' E. 



" The insect affects chasms or ravines in the lofty woods which encircle the 

 mountain in belts in various places. Where the sunbeams occasionally pierce 

 the woods and fall upon isolated or salient rocks in the above localities, they 

 are seen in myriads, either poising themselves in the rays, or reposing on the 

 spots on which the rays fall." 



Species 21. Diopsis (Sphryracephala) brevicornis. Say. 

 Tab. IX. Fig. 20. 



D. nigra, obscura, antennis pedibusque ferrugineo-flavidis, alls fascia apiceque 



fuscescentibus, pedunculis oculiferis brevissimis. 

 Long. corp. lin. 2^ ? . Wied. -iVths of an inch. Say. 



Habitat in Pennsylvania Americse Borealis. Say. In Mus. Say, Wiedemann. 

 Diopsis brevicornis. Say, in Journ. Acad. Nat. Sciences, vol. i. 181/, p- 23. 

 Achias brevicornis. Say in litt. 

 Diopsis brevicornis. IVied. Auss. Zweijl. Ins. vol. ii. p. 563. No. 8. Illustr. Gen. 



Achias, pi. 2. Griffith, Transl. "Rkgne Animal," No. 34. p. 774. pi. 62. 



Jig- 2. 

 Sphryracephala brevicornis. Say, American Entomology, vol. iii. pi. 52. 



