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



Gerstacker." He describes the following genera and spe- 

 cies : — 



1. Cyphomyia. Twenty-four species, eleven or twelve of which 



are new. 



2. Chordonota, N. G. Type, Cyphomyia inermis, Wied. 



3. Etiparyphus, N. G. Type, Cyphomyia elegans, Wied. 



4. Stratiomys. Nine species, five of which are new, two Mexican, 



two South American, and one South African. 



5. Ptilocera. Three species, two of which are new, one from 



Ceylon, and one from Port Natal. 



6. Acanthina. Two species, both of which are new, one from 



Brazil, and one from Ceylon. 



7. Chauna. One species. 



8. Blastocera, N. G. One Brazilian species. 



9. Spyridopa, N. G. One Brazilian species. 

 10. Panacris, N, G. One Cayenne species, 



Genus Acanthina, Wied. 

 Acanthina porcaia. 



Mas. — Nigra, antennis lanceolatis ferrugineis apice nigris thorace 

 non longioribus, thorace strigis marginalibus argenteo-tomen- 

 tosis, scutello spinis ferrugineis, abdomine crasso contracto 

 brevi lato strigis marginalibus argenteo-tomentosis, genubps 

 halteribusque fulvis, alis vix cinerascentibus, stigmate maximo 

 venisque nigris, his basi ferrugineis. 



Male. — Black ; antennae lanceolate, ferruginous with black tips, 

 not longer than the thorax ; thorax with marginal streaks of silvery 

 tomentum ; scutellum with ferruginous spines ; abdomen thick, 

 contracted, broader and much shorter than the thorax, with mar- 

 ginal streaks of silvery tomentum ; knees and halteres tawny ; 

 wings very slightly greyish, with a large black stigma ; veins 

 black, ferruginous at the base. 



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



Amazon Region. 



Acanthina longicornis. 



Fcem. — Nigra, capite thoraceque cinereo-tomentosis, antennis 

 linearibus thorace vix brevioribus, thorace strigis obscure 

 rufescentibus, abdomine dilatato strigis marginalibus radiatis 

 argenteo-tomentosis, tarsis testaceis apice nigris, alis cinereis 

 nebula costali nigricante, venis nigris, halteribus ferrugineis. 



