BY E. W. FERGUSON AND MARGUERITE HENRY. 839 



SlLVIUS PARALURIDUS, Sp . U . 



(Plate xlvi., fig. 7.) 



A large, reddish brown species very similar in appearance to 

 S. luridus. 



Female . Length, 15 . 5 mm. ; width across eyes, 5 . 25 mm . ; 

 wings, 13 mm. 



Head. Black; face covered with grey tomentum. Beard white. 

 Palpi long and slender slightly dilatate and concave at base, 

 brownish in colour. Antennae similar to S. luridus, third joint 

 slightly less dilatate at the base. Subcallus black, protuberant 

 not shiny as in S. luridus. Forehead slightly wider at vertex than 

 anteriorly; clothed with brownish tomentum; frontal callus 

 similar to S. luridus, darker in colour and extending farther 

 posteriorly. Eyes bare, ocelli distinct. 



Thorax blackish in colour covered with dark brown tomentum 

 with two stripes of grey pubescence on each side; the median 

 pair wider and more brownish in colour posteriorly, shoulders 

 reddish. Scutellum dark reddish brown, covered with dark 

 greyish pubescence . 



Abdomen reddish yellow with lighter segmentations, last three 

 segments blackish except at the sides, traces of white median 

 spots on second to fifth segments and with a fringe of whitish 

 hairs at sides, elsewhere clothed with short dark appressed hairs; 

 under surface reddish yellow, dark at apex, segmentations with 

 fringes of short hairs. 



Legs reddish yellow, tarsi darker; femora clothed with white 

 hairs; elsewhere black. Spurs present on hind tibia, small. 



Wings hyaline, no appendix present, stigma yellowish, incon- 

 spicuous . 



Very close to S. luridus Walker, but a more reddish yellow 

 coloured species. Long series of both species are before us and 

 the differences though slight appear to be constant, and the species 

 are readily separable by their appearance. In its general facies 

 this species presents a strong resemblance to Tabanus circum- 

 datus. 



This species was very abundant from November 19th to March 

 4th. Frequently found in the cattle yards; bites the fetlocks of 

 COWS and horses almost exclusively. 



SiLvius fergusoni Ricardo . 



Ann. Mag. Nat. Hist., (8), xix., p. 214 (1917). 



Though never very plentiful compared with some of the other 



