180 PROCEEDINGS OF THE ACADEMY OF [1898. 



longer than second and third joints together, its hairs rather few 

 (about eight above and six below). The exact shade of color varies 

 in different specimens, being sometimes darker and sometimes lighter; 

 in one female the third joint is almost a chestnut-brown. Proboscis 

 and palpi yellowish-brown. ' 



Thorax. — Color, varying shades of yellowish-brown, darker on the 

 dorsum. On the dorsum, bands of dark brown or bluish-gray, vary- 

 ing much in width in different specimens (in one male none at all). 

 A dark spot on the middle of the scutellum in all the females and 

 iu one male. 



Bristles of the Thorax, \, 9a, 9b, 9c. Humeral, 3. Posthumeral, 

 3, outermost on a level ventrad the presutural. Dorso-central, 6, 

 two in front and four behind the suture. Intra-alar, 4, one in front 

 and three behind the suture. Acrostichal, 6, three in front and three 

 behind the suture. Presutural, notopleural, supra-alar and post-alar 

 as usual. Post-sutural, I venture to apply this name to a bristle, 

 present in all the specimens of this species, which I have not been 

 able to find in any other Muscids that I have seen. It is situated 

 caudad the transverse suture of the thorax, a little mesad and cau- 

 dad the anterior supra-alar, and laterad the intra-alar No. 3 (I num- 

 ber the intra alars, dorso-centrals and acrostichals from the caudal 

 end of the thorax cephalad, thus the intra-alar nearest the scutellum 

 is No. 1). 



Scutellar. — Apical, three marginal, jugal, two discal of which the 

 anterior is considerably the larger. 



Abdomen. — Color : Principally yellowish-brown; of varying shade 

 in different specimens. There are also some very dark brown, al- 

 most black, markings as follows : on the first segment a very nar- 

 row band on the hind margin ; on second segment a broader band 

 and a median mark, (1, 11) the width of the band and the size of the 

 mark varying considerably ; third segment like second, but the band 

 broader and the mark larger, so that in some specimens almost the 

 whole segment is dark brown or black : fourth segment entirely 

 black or dark brown. 



Bristles. — There are bristles on the hind borders of the first three 

 segments. Toward and at the sides of the segments the bristles are 

 larger than toward the middle. All are more or less appressed. 

 Those toward the middle can hardly be called macrochaetae until 

 we reach the third segment. On the fourth there are some discal as 

 well as marginal macrochaetae, and they are none of them ap- 

 pressed. 



