332 Mr. F. Walker's Characters of undescribed Diptera 



attenuated in front ; abdomen deep black ; wings and halteres 

 black. 



Male. — Body very pilose ; tibiae ferruginous, witb black tips; 

 joints of the tarsi ferruginous at the base ; wings very slightly 

 greyish ; veins whitish ; costal veins black. 



Length of the body 2^ — Q lines; of the wings 5—6 lines. 



Mexico. 



Bih'io blrudls. 



Mas. — Ater, thorace cyaneo-nigro, tibiis posticis femoribusque 

 canaliculatis, femoribus tibiisque posticis clavatis, alis nigri- 

 cante cinereis apud costam nigricantibus. 



Male. — Deep black : thorax bluish black ; femora and hind 

 tibiae channelled ; hind femora and hind tibiae clavate ; wings 

 blackish cinereous, blackish along the costa. 



Length of the body 3 lines ; of the wings 6 lines. 



Natal. 



Genus DiLOPHUs, Meig. 



Dilophus desist ens. 



Foem. — Niger, abdomine sub-tuberculato, pedibus testaceis, 

 femoribus tibiis tarsisque apice nigris, coxis femoribusque 

 anticis dilatatis, his sub-spinusis, alis albidis, venis albis, 

 stigmate pallide fusco, halteribus testaceis. 



Female. — Black : abdomen tuberculated ; legs testaceous ; fe- 

 mora, tibiae and tarsi with black tips ; fore coxae and fore femora 

 dilated, the latter minutely spinose ; wings whitish; veins white; 

 stigma pale brown ; halteres testaceous. 



Length of the body 1| line; of the wings 3 lines. 



New South Wales. 



Fam. SIMULIDiE. 



Genus Simulium^ Latr. 



Simulium ochraceum. 



Foem. — Testaceum, albo-totnentosum, capite albo, thorace 

 ochraceo vittis duabus albis, abdomine nigricante basi tes- 

 taceo, femoribus tibiisque apice nigris, tarsis nigris basi 

 testaceis, alis vitreis pallido-venosis. 



Female. — Testaceous, with white toraentum : head white ; an- 

 tennae testaceous ; thorax ochraceous, with two white stripes ; 

 abdomen blackish, testaceous at the base ; femora and tibiae with 



