THEREVA. 301 



237. Thereva cylindrica, Walk. 



Thereva cylindrica, Walker, List Dipt. Brit.Mus. i, p. 224 (1848). 



<3 . " Body long and narrow ; head white, hoary behind, with 

 a few black bristles along the hind borders of the eyes, clothed 

 beneath with white hairs ; eyes green and red ; feelers black; 1st 

 joint clothed with black hairs; 2nd joint and base of the 3rd 

 tawny ; mouth piceous ; chest hoary, clothed with hoary down, and 

 with a few black bristles on each side, where there is a white 

 stripe, and it has also a broad yellowish-brown stripe in the 

 middle ; breast white and clothed with white hairs ; abdomen 

 brown, covered with silvery glance, yellowish brown towards the 

 tip, where it is clothed with dark tawny hairs ; hind borders of 

 tli3 segments pale tawny and adorned with fringes of white hairs ; 

 legs grey ; hips white ; wings slightly grey, tawny along the fore 

 border ; brands brown and narrow; veins piceous, slightly bordered 

 with dark tawny ; poisers piceous, with dark tawny knobs. 



" Length of the body 5 lines, of the wings 8 lines. East Indies." 

 (Walker.) 



Though described from the " East Indies," the type in the 

 British Museum bears the simple label " Ind.'"', which is considered 

 to signify India proper. 



238. Thereva indica, Walk. 



Thereva indica, Walker, Ins. Saund., Dipt. pt. 3, p. 159 (1852). 



$. "Body black; head shining above, tinged with grey and 

 clothed with hoary hairs beneath ; sucker and feelers black ; breast 

 tinged with grey; abdomen spindle-shaped, very much longer 

 than the chest ; hind borders of the segments and underside 

 tinged with grey ; legs tawny, beset with a few black bristles ; 

 claws black ; wings grey ; brands brown ; wing-ribs pitchy ; veins 

 black, pitchy at the base ; poisers pitchy. 



" Length of the body 5 lines ; of the wings 9 lines. East 

 India." (Walker.} 



239. Thereva persequa, Walk. 



Thereva persequa, Walker, Ins. Saund., Dipt. pt. 3, p. 158 (1852). 



2 . " Body black, head very shining above, silvery white in 

 front and beneath, where it is clothed with white hairs ; sucker 

 black; palpi tinged with grey, thickly clothed with white hairs; 

 chest grev, dull, adorned on each side with a pair of hoary stripes, 

 a pitchy tinge between each pair ; sides and scutcheon armed with 

 black bristles ; breast hoary, clotlied with white hairs ; abdomen 

 black, shining, clothed with very short black hairs, slightly 

 decreasing in breadth from the base to the tip, near twice the 

 length of the chest ; hind borders of the 1st and 2nd segments 

 fringed with short white hairs ; tip armed with a circlet of black 

 spines ; legs ferruginous ; hips black, tinged with hoary, clothed 

 with white hairs ; shanks beset with black bristles ; feet black, 

 pitchy at the base; foot-cushions pitchy: wings grey, slightly 



