844 LIST OF DIPTERA. 



Dexia vacua, Meig. Dipt. v. 46, 23, vii. 270, 13. Macq. Hist. 

 Nat. Dipt. ii. 212, 3. Zett. Dipt. Scand. iii. 1265, 3. Fall. 

 Act. Holm. 1816, 240, 10. Muse. 42, 10. 



a. France. 



b. ? From Mr. Children's collection. 



Dexia grisescens, Meig. xx. Dipt. v. 45, 21, vii. 270,10. Zett. Dipt. 



Scand. iii. 1278, 15. Musca grisescens, Fall. Muse. 44, 16. 



Dinera grisescens, Macq. Hist. Nat. Dipt. ii. 211, 4. 

 a. ? From Mr. Children's collection. 



Dexia mstica, Meig. Dipt. v. 46, 22, vii. 270, 8. Desv. Essai 



Myod.SU,}. Macq. Hist. Nat. Dipt. ii. 211,1. Zett. Dipt. 



Scand. iii. 1264, 2. Musca rustica, Fabr. Sp. Ins. ii. 440, 26. 



Ent. Syst. iv. 322, 41. Syst. And. 296, 64. Gmel. Ed. Syst. 



Nat. v. 2842, 187. 

 a. England. 



Dexia Posio, n. s., fem. Fulva, capite nigro antic e ferrugineo, tho- 

 race nigro quadrivittato, abdomine fulvo-cinereo cano tessellato, 

 pedibus nigris, alls subcinereis basi costa venarumque margini- 

 bus subfuscis. 



Body clothed with black hairs and bristles : head black, with 

 a brown tinge above, ferruginous, and covered with white bloom in 

 front ; a pitchy furrowed stripe between the eyelets and the feelers ; 

 epistoma not prominent ; sides of the face without bristles : eyes 

 pitchy ; fore part flat, its facets larger than those elsewhere: feelers 

 tawny at the base : chest and breast tawny ; chest adorned with 

 four black stripes : abdomen ohconical, gray, with a tawny tinge, 

 much longer, but not broader than the chest, tessellated with hoary 

 reflections : legs black, clothed with black hairs and bristles : wings 

 slightly gray, tinged with brown at the base, on the fore borders, 

 and along the veins ; wing-ribs dark ferruginous ; veins black, fer- 

 ruginous towards the base ; tip cross-vein forming a right angle 

 with the fourth longitudinal vein, curved inward near the base, 

 straight from thence to the tip, where it is slightly curved outward, 

 joining the third vein at some distance from the tip of the latter ; 

 lower cross-vein curved inward from the base to the middle, where 

 it forms an angle with a very short stump, almost straight from 

 thence to the tip ; scales white, with pale tawny borders. Length 

 of the body 5 lines ; of the wings 9 lines. 

 a. Cape. 



