458 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.43. 



directed backward besides the numerous small ones, abdomen with 

 the segments subequal, lateral bristles on second segment weak, 

 segments 1-4 narrowly margined posteriorly with yellow, 5-6 entirely 

 black, the latter vdih a few hail's; legs yellow, posterior femora and 

 tibise dusky apically, mid and hind tibiae setulose on the postero- 

 dorsal surfaces, those on hind tibise distinct, wings grayish, costa to 

 middle, first di\dsion more than twice as long as second, second twice 

 as long as tliird, fringe moderately long, fourth vein leaving at fork 

 of third with a gentle curve and runnmg slightly upward to before 

 the tip of wing, ending as much before wmg tip as fifth does behind 

 it, halteres bro\vnish yellow. 



Length, 2 mm. 



Type.—Csit. No. 14844, U.S.N.M. 



Two specimens; label, "2m. W. St. Louis, Mo., 9-VI-1904" (W. V. 

 Warner) . 



The peculiar veiy long mesopleural bristle should distinguish this 

 species, as well as the number of scutellar bristles, I am, however, 

 not inclined to consider the latter, owing to their size, as the normal 

 number in this species, as there may really only be four in some 

 specimens. The only Paleartic species that I know of with this 

 exceptional number of bristles on the scutellum is fiavicoxa Zetter- 

 stedt, which has six equal-sized bristles, though one in Zetterstedt's 

 collection has seven, as has also one in my collection in the Royal 

 Scottish Museum, Edinburgh. In some much smaller species in 

 ApJiiocJiseta there is the remarkable lengthening of one of the meso- 

 pleural bristles, but except next species they are considerably smaller 

 with only two scutellar bristles and other characters which easily 

 separate them from the above. (See also A. juli Brues and next 

 species after it in table.) 



APmOCH.«:TA SUBMARGINALIS, new species. 



Resembles in most respects the above species but the frons is as 

 stated in table, the antennae arc rather smaller and the arista shorter 

 than m marginalis. The long mesopleural bristle is also comparatively 

 shorter, the palpi are not so bright in color, the legs, especially the 

 hind pairs, are darker, the abdomen is entirely dark, the posterior 

 pair of legs are very strong, and the hind tibial setulse are short, 

 though strong, and regular on the apical two-thirds but absent on 

 the basal third. Otherwise as marginalis} 

 , Type.—Csit. No. 14845, U.S.N.M. 



One female, Plummers Island, Maryland (A. K. Fisher), 



» The scutellum is in poor condition so that I can not detect whether the additional bristles are present 

 as in marginalis. 



