122 Mr. F. Walker's Characters of undescrihed Diptera 



wards the tip, second, third and fourth segments with white hind 

 borders; legs tawny; anterior tibiae and hind knees testaceous; 

 tarsi black ; posterior tarsi testaceous at the base ; wings nearly 

 limpid, grey towards the tips, and with an incomplete grey band 

 in front of the middle ; veins black, testaceous at the base ; hal- 

 teres tawny, with whitish tips. 



Length of the body 4 lines ; of the wings 7 lines. 



Australia. 



Fam. 3. TABANIDiE. 



Many new and yet undescribed species of this family have been 

 discovered since 830 species were recorded in the above-mentioned 

 Catalogue. Seven new species are described in the Linnean Society 

 Journal, and Macquart, in his fourth Supplement, describes thirty- 

 nine new species, and two new genera, Mesomyia and Pelecorhyn- 

 chus. 



Genus Tabanus, Linn. 

 Tahanus hnponens. 



Fccm. — Cervinus, capitis callo ferrugineo longo gracili, thorace 

 cano-subtomentoso, tarsis nigris, tibiis posticis nigro vix 

 ciliatis, alls cinereis, halteribus apice albidis. 



Female. — Fawn colour ; head with a long slender uninterrupted 

 ferruginous callus; proboscis ferruginous; antennae broken ; thorax 

 and pectus with a slight hoary bloom ; abdomen unvaried ; tarsi 

 black ; hind tibiae with a very narrow black fringe ; wings grey ; 

 veins ferruginous ; halteres with whitish tips. 



Length of the body S lines ; of the wings 16 lines. 



Para. 



Tahanus unicinclus. 



Fcem, — Niger, antennis subarcuatis, articuli 3' dente valido 

 brevissimo, thoracis lateribus scutelloque obscure ferrugineis, 

 abdominis fascia albida, tibiis albis apice nigris, alis cinereis, 

 venis nigris. 



Female. — Black ; antennae slightly curved ; third joint with a 

 very short and stout tooth ; sides of the thorax and scutellum 

 dark ferruginous; abdomen with a whitish band at two-thirds of 

 the length ; tibiie white, with black tips ; wings grey ; veins black ; 

 fore branch of the cubital vein curved at its base, nearly straight 



