INSECTA SAUNDERSIANA, &c. 
Fam. XYLOTOMA, Meigen. 
Genus THEREVA, Zatr. 
TueEreva sequa, Mas et Fem. 
Cinerea, capite pectoreque albis, fem. thoracis vitta fusca, mari abdomine 
nigro subvittato apice fulvo, fem. abdomine fusco maculis trigonis 
albis ornato, pedibus nigris, tarsis basi tibiisque fulvis, alis limpidis. 
Male. Body black, thickly clothed with white hairs: head brilliant 
white in front: sucker black; chest gray; breast white: abdomen gray 
above, white beneath, very much longer than the chest; an indistinct 
black stripe along the back; hind borders of the segments adorned with 
white lustre ; tip tawny, with a little tuft of black hairs on each side: legs 
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 tawny: wings colourless; poisers black; their knobs pale yellow, 
black at the base. 
Fem. Body thinly clothed with short white hairs: head adorned with 
a silvery white covering : chest adorned with a very broad pale brown stripe ; 
scutcheon armed with four long black bristles: abdomen brown; first seg- 
ment white ; second and third adorned with white triangular spots, resting 
on the sides of their hind borders ; fourth with a white spot resting on each 
side of its fore-border ; fifth white, with the exception of a middle triangu- 
lar brown spot on its hind border ; sixth white; seventh black, shining ; 
tip armed with a circlet of black spines: knobs of the poisers black, pale 
yellow from half their length to the tips. 
Length of the body 4—4} lines; of the wings 7—8 lines. 
East India. 
