HOUGH: SOUTH AMERICAN MUSCID^. 231 



ment 4, which has one toward the side and one on the ex- 

 treme lateral border. The marginal rows are mere appressed 

 hairs on segments 1 and 2 and but little larger on segment 3 ; 

 even on segment 4 they are not at all large. 



The legs are dark brown, except the coxce and apices of the 

 femora, which are pale brownish yellow. The bristles of the 

 anterior femora are as usual in this genus. The anterior tibia 

 has a preapical group of three, viz., the usual one on the ex- 

 tensor border and two at the same level on the lateral surface, 

 one of which is very near the extensor, the other very near 

 the flexor border. The middle femur bears the usual anterior 

 median partial row, all of which are small ; the transverse api- 

 cal group consists of three on the posterior and one on the an- 

 terior surface. The middle tibia has on its posterior surface, 

 near the extensor border, a complete row of about equidistant 

 bristles extending from base to apex, which are mostly of insig- 

 nificant size, but two in the middle third and two or three near 

 the apex are as large as the usual bristles of this surface in this 

 genus. On the anterior surface of the middle tibia close to the 

 apex is a bristle which, if normal, will at once distinguish this 

 species from any other Muscid that I have seen ; it is half as 

 long as the tibia and projects cephalad, with a slight curve dor- 

 sad. It seems to me more probable that this is not a normal 

 structure, but has been accidentally (or purposely) stuck on here, 

 for the following reasons : (1) It is present only on one of the mid- 

 dle tibia^ the other showing not even a scar at this point ; (2) 

 the anterior sterno-pleural bristle of the side where the strange 

 tibial bristle is present has been broken off; (3) the remarka- 

 ble tibial bristle is just about the same size as the anterior sterno- 

 pleural bristle. The bristles of the hind femur are as usual in 

 this genus. The hind tibia has no bristles on its mesal surface ; 

 on its lateral surface near the flexor border there are two 

 bristles about at the middle, and on the same surface near the 

 extensor border there is one at the same level. 



The squamulae are white, almost hyaline. 



The hal teres are brownish yellow. 



The wing is represented in figure 17, It is very broad for a 

 Muscina, somewhat suggesting in shape that of a Phasia. The 

 species does not, however, belong to Phasiophana. The cross- 

 veins are distinctly clouded with brown. There is a dark 



