TAXONOMY OK MUSCOIDEAN FLIES — TOWNSEND 8l 



length 4§ mm., of wing 3 mm. The writer has examined the type 

 in Cambridge. The hind crossvein does not form a right angle with 

 fifth vein, the petiole of apical cell is fully twice as long as small 

 crossvein, the head is black and shining except face, and the meso- 

 scutum does not show silvery before suture. 

 Type.— Cat. No. 10,898, U. S. N. M. 



Subfamily Ocypterin.e 

 Genus Ocyptera Latreille 



Ocyptera euchenor Walker. — While it seems probable that this 

 form and epytus Walker are the same, there can be no certainty in 

 the matter until the types are compared. Probably 0. Carolina 

 Robineau-Desvoidy is distinct. Some of Bigot's species may also 

 prove distinct. It seems probable that Carolina is a southern form, 

 and that euchenor is the more northern large form, having the 

 cheeks and parafacials narrow, and the eyes elongate, descending 

 low. Further study may also show the distinctness of dosiades. 



Genus Beskia Brauer and von Bergenstamm 



Beskia cornuta Brauer and von Bergenstamm and allies. — B. cor- 

 nuta is the South American form. The type is from Brazil. The 

 figure of the head given by the authors (fig. 276, Muse. Schiz., 1) 

 is not typical of Southern States specimens in U. S. N. M. There 

 is a marked difference in the third antennal joint. Williston's figure 

 of his St. Vincent specimen shows the third antennal joint same as 

 the Brazilian. Beskia and Ocypterosipho may be separated on this 

 character. 



Genus Ocypterosipho Townsend 



Our species may be known as Ocypterosipho eclops Walker. Al- 

 though Walker says "palpi black," and does not mention the slen- 

 der and elongate proboscis. Mr. E. E. Austen's statement that celops 

 belongs here (Ann. Mag. N. H., Ser. 7, vol. 19, p. 345) must be 

 accepted. This is the Georgia and Southern States form, and has 

 the third longitudinal vein bristly to small crossvein (Georgia, Lou- 

 isiana, and Texas specimens in U. S. N. M.). Santo Domingo 

 specimens agree with those from the Southern States in having the 

 third antennal joint strongly convex on under border and concave 

 on upper, presenting a curved outline like that of a pruning-knife 

 blade with cutting edge upward, the anterior distal corner of the 

 joint being produced in profile into a sharply pointed prolongation. 



