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



Fam. 5. ASILIDtE. 



Sub-fam. 1. Mydasites. 



Fifty-nine species of this sub-family are referred to in the 

 Catalogue, and Macquart has published seven species of Mydas 

 and one of Cephalocet a, in his fourth Supplement. 



Mydas effracta. 



Fcem. — Nigra, capite antice subtusque, antennis basi, thoracis 



vittis duabus, scutello pedibusque fulvis, abdomine maculis 



sex luteis, femoribus posticis basi flavis, alis luridis, striga 



discali fuscescente, areolarum discis sublimpidis, venis halteri- 



busque fulvis. 



Female. — Black, thinly clothed with tawny hairs ; head tawny 



in front and beneath ; antennae at the base and proboscis tawny ; 



thorax on each side with a tawny stripe, which is dilated in front 



about the callus; scutellum tawny; abdomen on each side with 



three luteous spots, which are obliquely truncated hindward ; legs 



tawny ; hind femora yellow at the base ; wings lurid, with a 



brownish discal streak at nearly three-fourths of the length ; most 



of the areolets with nearly limpid discal streaks of various 



breadth ; veins and halteres tawny. 



Length of the body 11 lines; of the wings 15 lines. 

 Anstralia. 



Mydas signaia. 



Mas. — Atra, capite piceo albo-piloso, thorace maculis duabus 

 anticis vittisque duabus lateralibus interruptis testaceis, ab- 

 domine maculis lateralibus trigonis argenteis, pedibus ante- 

 rioribus piceis, alis albido-limpidis, venis nigris fusco-submar- 

 ginatis, halteribus ex parte albidis. 

 Male. — Deep black ; head thinly clothed with whitish hairs, 

 above piceous, with hoary tomentum on each side ; thorax with 

 two testaceous spots in front, and with an interrupted irregular 

 testaceous stripe on each side ; abdomen with triangular silvery 

 hoary spots on eacli side ; anterior legs piceous ; wings whitish, 

 limpid ; veins black, slightly bordered with brown ; halteres partly 

 whitish. 



Length of the body 10 lines ; of the wings 12 lines. 

 Australia. 



This species differs much from the preceding one ; the antennae 



