246 



WALKER ON 



bene determinatum aut fere inconspicuum : abdomen subpetio- 

 latum aut sessile, convexum, arcuatum, cylindricum aut depres- 

 sum, lineare aut elongato-ovatum, maris nonnunquam apice 

 comubus aut ciliis vestitum, 4-annulatum : pedes elongati aut 

 breves, maris femoribus et tibiis anticis saepe subtus dentatis et 

 spinosis, coxis anticis elongatis, maris tarsis intermediis non- 

 nunquam dilatatis : alas angustse, nervis longitudinalibus subrectis : 

 halteres capitati, ab alis remoti. 



The insects of this family and of Ortalis, may be frequently 

 seen running on leaves in the sunshine, driving away any of 

 the larger Muscides which may chance to alight near them, 

 and continually vibrating their wings ; their economy is un- 

 known. Sepsis is nearly allied to Ortalis, Nemopoda to 

 Calobata, and Themira to Piophila. 



subpetiolatum 

 Ala. 



Abdomen \ 



sessile 



I 



Characteres Generum. 



maculatse. Mas, Femoribus tibiis- 

 que anticis, subtus dentatis et 

 spinosis 1. Sepsis. 



in utroque sexu sim- 



plices 2. Nemopoda. 



A/as.Femoribus tibiis- 

 immaculata J que anticis subtus 

 Pedes. \ dentatis et spinosis, 

 tarsis intermediis di- 

 latatis. Fern. Tarso- 

 rum articulo 1°. basi 

 compresso .... 3. Enicopus. 



Metathoracis scutellum bene deter- 

 minatum 4. Themira. 



Metathorax supra inconspicuus . 5. Saltella. 



Genus I. — Sepsis. Fallen. 

 Musca . . Lmn. De Geer, Harris, Fabr. Gmel. Schrank, 



Panzer, Berk. Stew. Turt. Olivier, Coquebert. 

 Tephritis . Fabr. 



yiicvo'peza., Meigen, Lair. R. Desvoidy. 

 Sepsis . . Fallen, Meig. Wied. Latr. Curtis. 



Corpus setosum : palpi vix conspicui : antennae seta indistinct^ 

 articulata : metathoracis scutellum bene determinatum : abdomen 

 subpetiolatum, convexum, arcuatum, apice subtus incurvum, 

 segmento 1°. elongato, apice supra tumido, reliquis brevioribus, 

 maris subclavatum, fern, elongato-ovatum : pedes setosi, graciles, 

 elongati ; maris femora antica subtus dentata et spinosa ; tibiae 



