NO. 1938. TEE DIPTSROUa FAMILY PHORIDM—MALLOCH. 441 



Genus BECKERINA' Malloch. 



TABLE OF SPECIES. 



Halteres black, coeta but little beyond middle of wing, fringe long. 



umbrimargo, p. 441. 

 Halteres yellow, costa very much beyond middle of wing, fringe very short. 



orphnephiloides, p. 441. 



BECKERINA UMBRIMARGO Becker. 



This species is not recorded from America. Tliese two species 

 may be known by the erect post-antennal bristles from the species 

 included in ApJiiochseta. There are also other structural differences 

 which caused me to separate the then existing single species from 

 Aphiocliseta in the paper above mentioned. It is not unlikely that 

 unibrimargo will occur in this country. It is not uncommon in Britain 

 and occurs in damp woods. Like the next species it has the meso- 

 pleur£e and hind tibia without bristles, has four strong scutellar 

 bristles, and the costa decidedly swollen on the outer half, it is 

 smaller than next species, being 2J mm. 



BECKERINA ORPHNEPHILOIDES, new species. 

 Plate 36, figs. 8, 10. 



Black; head small, frons one and one-haK times as broad as long, 

 ocelli rather close together, triangle raised, frontal suture indistinct, 

 bristles strong, post-antennal four erect and in almost a strait Hne, 

 center pair of bristles in lower row close to post antennal bristles, 

 center pair in second row in line with outer pair in first row, outer 

 pair in second row in usual position in Hne almost with front ocellus, 

 third joint of antennae round, pubescent, large, arista pubescent, very 

 long, as long as front tibia, basal jomts short, not much swollen; 

 palpi almost as large as antennae, brown, weakly bristled; thorax 

 brown, pleurae lighter, two dorso-central bristles, four strong scutel- 

 lar bristles, mesopleurae bare, abdomen long and narrow, second seg- 

 ment elongate, with several long hair-Uke bristles on lateral posterior 

 margins, hypopygium large, central processes lameUiform, anal pro- 

 tuberance small, yellowish; legs very long and slender, femora but 

 little thickened, yellow, the coxae browQ at base, legs almost entirely 

 bare, hind tibiae with only fine, close-placed hairs, no distuict setulae, 

 tibial spurs well developed, wings long, costa to two-thirds the wing 

 length, apical two-thirds much swollen, first costal division about 

 equal to second, tliird one-half as long as second, fringe short and 

 fine, not longer than diameter of costa, fourth vem leaving at mid- 

 way beyond fork with a distuict curve, and running nearly straight 

 to wing tip, fifth and sixth veins very close together; halteres yellow. 



1 Ann. and Mag. Nat. Hist. (Scot.), 1910, p. 90. 



