158 INSECTA SAUNDEBSIANA. 



Thereva sequens, Mas et Fem. 



Cinerea, capite pectoreque albis, abdomine mari apice fulvo, antennis pe- 

 dibusque nigris, tarsis basi tibiisque fulvis, alis subcinereis. 



Male. Body black, thickly clothed with white hairs, narrower than that 

 of T. sequa : head brilliant white in front : sucker and palpi pitchy: chest 

 gray, breast white : abdomen white, full twice the length of the chest, more 

 linear than that of T. sequa, conical towards the tip tvhich is tawny and has 

 a little tuft of black hairs on each side : lejjs black, beset with a few black 

 bristles, which are chiefly on the shanks ; hips and thighs adorned with a 

 white covering, clothed with short white hairs ; shanks tawny with black 

 tips ; feet tawny at the base ; foot-cushions dark lawny : wings slightly 

 gray ; poisers tawny, their knobs excepting the base pale yellow. 



Fem. Body thinly clothed with short white hairs, completely adorned 

 vnth a white covering, xvhich has a yellow tinge above : scutcheon and hind 

 part of the chest beset with black bristles : tip of the abdomen armed with 

 a circlet of black spines : poisers black ; their knobs tawny, black at the 

 base. 



Length of the body 3^ lines; of the wings H lines. 



East India. 



Thereva persequa, Fem. 



Cinerea, capite albo, thoracis vittis quatuor pectoreque canis, abdomine an- 

 tennisque nigris, pedibus ferrugineis, tarsis nigris basi piceis, alis 

 cinereis venarum marginibus subfuscis. 



Body black : head very shining above, silvery white in front and be- 

 neath where it is clothed with white hairs : sucker black ; palpi tinged w ith 

 gray, thickly clothed with white hairs : chest gray, 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, clothed with white 

 hairs : abdomen black, shining, clothed vAth 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 first and second segments fringed with short 

 white hairs ; tip armed with a circlet of black spines: legs ferruginous ; 

 hips black, tinged with hoary, clothed with while hairs ; thighs clothed with 

 a few very short white hairs ; shanks beset with black bristles ; feet black, 

 pitchy at the base ,• foot-cushions pitchy : wings gray, slightly tinged tcith 



