LIST OF DIPTERA. 225 



tawny, very narrow ; veins tawny along the fore borders, piceous 

 along the hind borders ; poisers tawny, piceous towards the tips of 

 the stalks ; knobs yellow. Length of the body 5 lines ; of the 

 wings 8 lines. 



a. Nova Scotia. From Lieut. Kedman's collection. 



Thereva spiloptera, Wied. Anal. Entom. 20, 3. Auss. Zweif. i. 



234, 10. 



a. Tunis. From Mr. Fraser's collection. 



Thereva pictipennis, Wied. Dipt. Exot. i. 113, 6. Auss. Zweif. i. 



235, 11. 



a. Georgia. From Mr. Abbot's collection. 



Thekeva tricolor, n.s., fern. Fulva, capite pectoreque albis, abdo- 

 mine cano nigro fasciato, antennis cinereis, pedibus canis, tibiis 

 fulvis, tarsis piceis, alts limpidis. 



Head white, pale tawny between the eyes, having a few black 

 bristles above, and more thickly clothed beneath with white hairs : 

 eyes, feelers, and mouth gray: chest tawny, which colour passes 

 into gray and thence into hoary on each side; it is very thinly 

 clothed with short black hairs, and has a few long black bristles on 

 each side ; there are five very narrow and indistinct brown stripes 

 on the back : breast white and clothed with white hairs : abdomen 

 hoary, clothed with white hairs, almost white beneath ; every seg- 

 ment with a large black band, whose hind border is convex, and oc- 

 cupies nearly the whole of the middle of the segment : hips and 

 thighs hoary, and clothed with white down, the former having also 

 a few long black bristles ; shanks tawny, with piceous tips, furnished 

 with long black bristles ; feet piceous, beset with short stout black 

 hairs and long black bristles ; first joint tawny till near the tip : 

 wings quite colourless ; fore border beset with a row of very small 

 black bristles ; veins and poisers tawny, the latter somewhat brown 

 at the base of the knobs. Length of the body 3 lines ; of the wings 

 6 lines. 



a. New Holland. Presented by J. Hunter, Esq. 



Thereva conformis, n. s., fern. Fulvo-cinerea, capite albo, thorace 

 vittis tribus fuscis, lateribus pectoreque canis, abdomine fusco, 

 cinereo et flavo fasciato fulvoque maculato, antennis nigris, pedi- 

 bus fulvis, femorum vittis tar sisque piceis, alis fulvis. 



This species and T. concolor are quite distinct from T. misella. 

 (Ent. Mag. ii. 472). Head almost white, tawny-gray between the 



