HOUGH: SOUTH AMERICAN MUSCID.^. 229 



basal and middle, the other at that of the middle and apical 

 thirds ; the male has these two, and in addition a third, 

 smaller, bristle, which lies between the other two, nearer the 

 apical one. The hind femur is as usual in this genus. The 

 hind tibia has three bristles ; two are on the lateral surface, one 

 near the flexor, the other near the extensor border, and the 

 third is on the mesal surface near the extensor border ; all three 

 are near the middle of the tibia. 



The wing of the female is shown in figure 15. The brown 

 spots on the wing are smaller and less deeply colored in the male 

 specimen. The first and third veins are spinose their entire 

 length on both surfaces of the wing. The spines are more 

 easily seen in the female. 



The squamuhe have a faint brownish-yellow tinge, but are 

 almost hyaline. The halteres are brownish yellow. 



Muscina latipennis, nov. sp. 



One female; Chapada ; January. Length, 7 mm. 



The ground color of the facial fossa, vibrissal ridge, gena, 

 transverse impression of the face, bucca, occiput and posterior 

 orbit is a pale brownish yellow. All these parts are pollinose — 

 the occiput, bucca and posterior orbit grayish, the others 

 whitish or silvery. 



The bucca is extremely narrow, hardly reaching a level 0.1 

 mm. veutrad the ventral border of the eye. The bucca bears 

 a row of stout bristles parallel to and a short distance from the 

 lateral border of the mouth opening and also a few hairs. 



The occiput is so closely applied to the thorax that I can see 

 no bristles thereon except the cilia of the posterior orbit, which 

 are normal. 



The principal vibrissa is distinctly dorsad the free border of 

 the clypeus. Ventrad the principal are two secondary vibrissse. 

 Dorsad the principal vibrissa on the vibrissal ridge there is first 

 a small clump of minute bristly hairs, and from this a row of 

 still more minute hairs (hardly visible with twenty diameters) 

 extends dorsad three-fourths of the distance to the base of the 

 antennae. 



The divergence of the mesal border of the eyes from the base 

 of the antenna' ventrad is very slight, so that the sides of the 



16-K.U.Qr. A-ix3. 



