LIST OF DIPTERA. 655 



22. Pboctacanthus posticus. 



Fcem. Cinereus ; caput subtus albidum alboque pilosum ; mystax 

 pallide teslaceus ; antenna nigrce ; thorax nigro obsolete tri- 

 vittatus ; abdomen segmentis bo et 60 supra nigris subtus 

 fuhis, apice rufo ; pedes fulvi, nigro vittati ; alee cinema 

 marginatce. 



Fern. Cinereous. Head whitish and clothed with white hairs 

 beneath. Mystax pale testaceous. Antennae black. Thorax with 

 two indistinct parallel blackish stripes. Pectus with a testaceous 

 stripe on each side. Abdomen oblanceolate, more than twice the 

 length of the thorax, extending very much beyond the wings, red- 

 dish beneath and at the tip ; fifth and sixth segments black above, 

 tawny beneath. Legs tawny, with whitish down and spines ; femora 

 and tibia? with black stripes on the outer side ; tarsi piceous. Wings 

 gray ; disks nearly limpid. Halteres testaceous. Length of the 

 body 5^ lines ; of the wings 6 lines. 



a. Melbourne, Australia. From Mr. Baly's collection. 



Country unknown. 



A. Femora supra nigra. ----- Icadius, Walk. 



B. Femora postica nigra. - Ogulinus, Walk. 



Group 1. 



Antennarum arista articulo 3o non longior. 



Characters like those of Proctacanthus heros, but with the arista 

 not longer than the third joint of the antennae. 



23. Pboctacanthus Icadius. 

 Asilus Icadius, Cat. of Dipiera, Pt. 2, 421. 



24. Pboctacanthus Ogulinus. 



Asilus Ogulinus, Cat. of Diptera, Pt. 2, 421. 

 Proctacanthus Icadius. Var. ? 



Genus 7. ASILUS. 



Corpus maximum, magnum, aut mediocre, elongatum, hir- 

 sutum, non dilatatum, nee ciliatum, color saepissime niger, hirsutie 

 subcinerea, nonnunquam luteum, aut metallicum. Proboscis 

 valida, lanceolata. Antenuae arista elongata. Tibiae spinosse ; 



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