10 



females of the Chrysops are, of course, blood-suckers, while the feeding 

 of the males is not known. The species, japonidts and mlokosiewicsi t 

 are very often found on the body of horses, and suavis, sinensis and 

 disfiar on cattle. * 



I. SilvitlS, Meigen. 



Syst. Beschreib., II, p. 27, 1820. 

 hctenopsis, Macq., Dipt. Exot., I, p. 115, 1838. 

 Mesomyia, Macq., Dipt. Exot., Suppl. IV, p. 341, 1850. 

 Veprius, Rond., Archiv. Zool. Modena, III, p. 83, 1863. 

 Esenbeckia, Rond., Archiv. Zool. Modena, III, p. 83, 1863. 



Middle or small-sized slightly hairy flies of yellowish colour, 

 with usually hyaline wings. Face slightly arched under the antennae, 

 moderately broad but extending only a little under the eyes, without 

 any callosities ; below the antennae is a transversal sulcus ; a longitu- 

 dinal sulcus from the end of that sulcus to a deep pit on the side of 

 the middle part of the face; face pubsecent but not hairy; frons of 

 the female broad and bearing on the fore part a large shining callus 

 or without any callus ; three ocelli present. Proboscis moderately 

 produced and with large sucker-flaps ; palpi shorter than the proboscis 

 but longer than the half, and lying against it in the female. Eyes bare. 

 Antennae somewhat longer than the head ; first joint longer than the 

 second which is so long as the width, and both apically clothed with 

 black hairs ; third joint bare and slightly upturned at the tip, somewhat 

 longer than the two basal ones together, subulate, and with five fairly 

 distinct annulations of which the first is long, but the last four are 

 short, and the apical one is blunt at the tip and bears a few minute 

 but distinct hairs and no tract of an apical style. 



Thorax quadrate with rounded angles ; hurneri distinct, with a 

 large rounded praealar callus between them and wing-bases. Pubescence 

 on the disc fairly abundant especially forwards ; pleurae conspicuously 

 hairy on the upper part of the mesopleurae and on the pteropleuraT 



