DIPTEHA. 268 



pressed, obliquely lonndcd at the tip, nearly twice the length of the second 

 joint: abdomen full twice tbelengtb of tbe chest; first segment cylindrical, 

 with a large testaceous spot on each side of the hind border ; second and 

 following' segments together spindle-shaped, broader than the first, and 

 about twice its length ; second testaceous along tbe fore border ; tip 

 curved beneath : legs red ; fore-thighs black towards the base ; feet black : 

 ivings almost colourless, dark broivn along the fore border for full one-third 

 of the breadth ; first posterior areolet closed on the border of the wing ; 

 praebrachial vein almost straight beyond its flexure ; veins black : alula; 

 whitish with pale yellow borders : halteres yellow. Length of the body 

 5 lines ; of the wings 8 lines. 

 Van Diemen's Land. 



Genus TACHINA, Fabr. 



In this and in some of the following groups, the genera of Desvoidy 

 and of Macquart are not adopted, as tbe characters assigned to them fre- 

 quently difler from those of the speciCs here described. 



The following Tachiuse may be grouped thus : — 



a. Fifth feeler-joint long. 



b. Second feeler-joint long. 



c. Third feeler-joint twice the length of tbe second. 



sirailis. 

 c c. Third feeler-joint longer than tbe second. 

 (/. Third feeler-joint convex above Juriiiia. 



pilosa, triformis, notata. 

 dd. Third feeler-joint straight above llystricia. 



varia, caliginosa, lativilta, similis. 

 c c. Third feeler-joint shorter than the second. 



d. Palpi clavate Fabricia. 



Californiae, divisa. 

 dd. Palpi filiform Echinomyia. 



e. Third joint almost straight above. 



bomboidcs, nitida, sobria, subcinerea, vittata. 

 e e. Third joint very convex above. 



atra, transversa, obtusa, dorsalis, apicalis, fulva. 



