1898.] NATURAL SCIENCES OF PHILADELPHIA. 183 



are only a few minute bristles not extending as far as the ventral 

 end of the arm of the frontal suture; ventrad the principal vibrissa 

 are four lesser vibrissa inserted along the edge of the mouth opening 

 as far as the cephalic end of the bucca. 



Thorax. — Color, as mentioned above. Halteres yellow. Tegulse 

 hyaline, milky white toward the edges. 



Bristles, I, 15a, 15b, 15c. Humeral, 2. Post humeral, 1, on a level 

 dorsad the presutural. Dorso-central, 5, two in front and three be- 

 hind the suture. Intra-alar, 3, none in front of the suture. Acros- 

 tichal, 2, one in front and one behind the suture, both small. Presu- 

 tural, notopleural, supraalar and postalar as usual. Scutellar : apical, 

 two submarginal and one small discal or subapical. 



Mesopleural. At the dorso-cephalic angle is a group of little 

 hairs, among which two are more prominent than the rest, and per- 

 haps deserve to be called bristles, an arrangement recalling the 

 prominent bristle in this situation which is so constant in the genera 

 Morellia, Muscinia, Musca, Myospila and their allies. As usual, there 

 is a large bristle just ventrad the prostigma, a little ventrad and 

 caudad this bristle is another, much smaller but decidedly promi- 

 nent, which I have not found in any other Muscid. 



Stemopleural. Two in front and one behind. Pteropleural and 

 hypopleural present. 



Wing. Venation shown in the figure. On the third longitudi- 

 nal vein are about ten little spines quite regularly distributed from 

 the base to near the small cross vein. There is a costal spine just 

 basad the end of the auxiliary vein. 



Ventral surface of abdomen. No ventral membrane ; second 

 ventral segment overlaps the edges of the corresponding dorsal, all 

 the other ventral segments are overlapped by the corresponding 

 dorsal. 



ii. 



Bristles of the Legs. — Anterior femur as usual. Anterior tibia : 

 ateral flexor row has one large bristle at the junction of the middle 



