HOUGH: SOUTH AMERICAN' MUSCIDE. 221 



holds the insect with its head towards him and looks vertically 

 down upon the dorsum. Then one can easily see : (1) A faint 

 median stripe which ends a little cephalad the scutellum : (2) 

 on each side, somewhat mesad the line of the dorso-centrals, a 

 stripe which is narrow and well defined cephalad the suture, 

 but caudad the suture becomes broader and less well defined 

 and fades out before reaching the scutellum ; (3) on each side, 

 cephalad the suture, laterad the dorso-centrals. mesad and 

 caudad the posthumeral bristle, a triangular spot ; (-1) on each 

 side, caudad the suture, laterad the dorso-centrals, and mesad 

 the line of the intra-alar bristles, a short stripe, which reaches 

 neither the suture nor the scutellum; [o) on each side a few 

 other small, irregular spots not symmetrical!}' situated. The 

 cha'totaxy of the thorax is represented in figure 10. The hal- 

 teres are pale brownish yellow. The squamuloe are almost 

 hyaline, with a slight brown tinge ; their borders are narrowly 

 dark brown and their marginal pubescence pale. 



The abdomen has the same In'own ground color as the thorax 

 and tlie same gra^'ish pollinose coating. The ground color 

 shows through the pollen around the bases of the small hairs in 

 such a way as to produce the appearance of a gray pollinose 

 abdomen densely punctuate with brown. The first segment of 

 the abdomen has a marginal row of small, appressed bristly 

 hairs which are rather larger toward the sides of the segment. 

 The second segment has a similar row of larger, less appressed 

 bristles. The third segment has a similar row of still larger, 

 not at all appressed bristles, and in addition, toward each side 

 of the segment, on the disc, a row of three or four nearly erect, 

 delicate bristles. The fourth segment has both- a marginal and 

 a discal row of erect, delicate bristles. 



The legs and the pulvilli are wholly brownish yellow. The 

 bristles of the anterior femora are as usual in this genus. The 

 anterior tibia has the usual preapical of the extensor border, and 

 at the same level, on the mesal surface, very near the former, 

 another preapical bristle. The middle femora have no notice- 

 able bristles except the transverse apical group, which consists of 

 only two members, both distinctly on the posterior surface of 

 the limb. The middle tibia has no bristles on either the an- 

 terior or fiexor surface ; on its posterior surface there are two, 

 one at the middle and tlio other at the junction of the tliird and 



