LIST OF DIPTERA. 227 



b. Hypostoma almost naked. 



Thereva imberbis, Meig. Dipt, ii. 128, 20. Zett. Lis. Lapp. 524, 

 8. Bibio imberbis, Fall. Dipt. Suec. Anthrac. 5, 5. Platyper. 

 11, 5. Psilocepbala imberbis, Zett. Dipt. Scand. i. 212, 1. 

 Gim. Bull. Soc. Imp. Nat. Mosc. 1847. xx. 1, 208, 3. 



a. France. 



Thereva singula, n. s. (n. g. ?) fern. Purpurea, capitefulvo, abdo- 

 mine viridi-cyaneo, pedibus nigris, tarsis flavis, alis flavis, 

 apice fuscis. 



Head tawny, piceous above between the eyes, which are red : 

 mouth and feelers bright tawny ; first and second joints of the latter 

 short; third joint longer, compressed, nearly oval; fourth joint 

 lanceolate, small, slightly curved : chest and breast bright purple, 

 smooth, shining, thinly clothed with short black hairs, and having a 

 few black bristles on each side : abdomen blue, smooth, shining, 

 with a green tint here and there, sparingly furnished with black 

 hairs, which are most thick towards the tip ; the seven or eight seg- 

 ments successively decrease in length from the base to the tip ; first 

 segment tinged with purple : legs black ; thighs and shanks clothed 

 with short black hairs, and the latter also beset with black bristles ; 

 knees tawny ; feet yellow, furnished with short tawny hairs and 

 longer tawny bristles : wings yellow from the base to the middle, 

 brown thence to the tips ; veins agreeing in colour with the part of 

 the wing through which they pass ; poisers yellow. Length of the 

 body 4 lines ; of the wings 9 lines. 



The feelers differ from those of the other species of the genus ; 

 the abdomen is convex, and the seventh apical areolet is open. 

 Allied to Dasyomma ? Macq. Dipt. Exot. ii. 1, 31, 3. 



a. Western Australia. From Mr. Clifton's collection. 



Chiromyza, Wiedemann. 



Chiromyza, vittata, Wied. Nov. Dipt. Gen. 20,/. 8. Dipt. Exot. 



i. 114, 1. Auss. Zweif. i. 237, 1. Macq. Hist. Nat. Dipt. i. 



422, 1, pi. 10, /. 10. Jenson, Bull. Soc. Imp. Nat. Mosc. iv. 



337. Blanch. Hist. Nat. Anim. Art. 604. Guer. Icon. Regn. 



Anim. Ins. pi. 97,/. 7. 

 a. Brazil. From Mr. Children's collection. 



