224 LIST OF DIPTERA. 



the fore borders ; wing-ribs and veins piceous ; poisers yellow. 

 Length of the body 4§ lines ; of the wings 8 lines. 



a. Massachusetts. Presented by the Entomological Club. 



Thereva cylindrica, n. s., mas. Carta, angusta, capite pectoreque 

 albis thorace flavo-fusco univittato alboque bivittato, abdomine 

 fusco argenteo micante fuscis fulvis albo ciliatis, pedibus einereis 

 alls subcinereis. 



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 ; first joint 

 clothed with black hairs ; second joint and base of the third 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 the segments pale tawny and 

 adorned with fringes of white hairs : legs gray ; hips white : 

 wings slightly gray, 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. 



a. East Indies. From Archdeacon Clerk's collection. 



Thereva senex, n. s., fern. Cinerea, capite pectoreque canis, abdo- 

 mine fasciis ferrugineis, basi piceo, segmenti 2*- margine postico 

 cano, antennis pedibusque einereis, tibiis fulvis, tarsis piceis basi 

 fulvis, alis limpidis. 



Head hoary, thickly clothed with w r hite hairs, dark brown be- 

 tween the eyes, behind which there are two or three rows of black 

 bristles : eyes and eyelets red : feelers gray ; the first joint furnished 

 with black bristles: mouth piceous: chest gray, thinly clothed 

 with short yellow hairs, and having a few black bristles on each side; 

 breast hoary, more thickly clothed with long white hairs : abdomen 

 gray, clothed with short yellow hairs, which are most thick on the 

 sides of the segments at the base ; hind borders of the segments fer- 

 ruginous ; first segment piceous : hind border of second segment 

 hoary : hips and thighs gray, the former thickly clothed with long 

 white hairs, the latter more thinly furnished with short yellow hairs, 

 and having also a few black short bristles : tips of thighs tawny ; 

 shanks tawny, with piceous tips, beset with very small black hairs 

 and long black bristles : feet piceous, clothed with short black hairs, 

 and having also black bristles at the tip of each joint ; first and se- 

 cond joints tawny, executing their tips: wings colourless; brands 



