NO. 2119. BRITISH FOSSIL INSECTS— COCKERELL. 491 



distance from apparent crossvein to end of R, 1,150; distance from 

 apparent crossvein to base of wing, about 1,280; distance (vertical) 

 between upper side of cell in fork of media and Rs, 304; stem of media 

 before fork, about 1,440; fork of media to end of i/j+z, 1,600; fork 

 of media to end of J/g, 1,090; wing margin between ends of Cu^ and 

 Cu^, 720. 



Oligocene at Gurnet Bay (Brodie). Lacoe Coll. 7,620. On small 

 piece of rock witli Philoponites, etc. This may possibly be identical 

 with one of tlie species described by Meunier from amber; but, if so, 

 this can not be demonstrated. The amber species are separated 

 mainly on antennal characteis. In S. gurnetensis the radius ends 

 distad (though not much) of the fork of the media, throwing the 

 species in the group of S. splendida, errans, and villosa. The wings 

 of these three species have not been precisely described. 



Holotype.— Cat. No. 61435, U.S.N.M. 



SCIARA. LACOEI, new species. 



Plate 62, fig. 6. 



Eyes large and prominent, about 96 fi across, the diameter of face 

 between the eyes about 80 n; wings ample, about 1.5 mm. (more 

 precisely, 1,600 fx) long and 640 /a wide (deep), pale reddish, with the 

 veins very pale yellowish; fork of media invisible, only the ends 

 of the branches seen, the whole vein being extremely faint, as 

 in various living species; radius (first vein) and Cu^ ending at same 

 vertical level, halfway between base and apex of wing; Rs ending 

 160 M from level of apex of wing, its course, as also the rather long 

 and narrow anal field, as in the living ;S'. prolijica Felt; apparent 

 crossvein between R and Rs (really base of Rs) 480 fx from base of 

 wing and 320 from end of R. 



Oligocene at Gurnet Bay (Brodie). Lacoe Coll. 7651. Easily 

 known from S. gurnetensis by the much smaller size. 7583 (Gurnet 

 Bay) is another example of S. lacoei. 



Holotype.—Ceit. No. 61436; U.S.N.M. 



SCIARA PROTOBERIDIS, new species. 



Plate 62, fig. 7. 



Length about 2.2 mm.; wings 2 mm. long, faintly dusky; venation 

 normal for the genus, except that the cell in the forks of the media 

 is greatly contracted apically (a tendency to be contracted may be 

 seen in certain livmg species, as S. impatient Johannsen); stem of 

 media before fork obsolete, or so faint that it can not be detected in 

 the fossil; apparent basal continuation of radial sector perfectly 

 straight. The followmg measurements are in /x: Base of wing to 

 end of R, 1,200; apparent crossvein (base of Rs) from R to Rs, about 

 28 long and 352 from end of R; end of Cu^ about 1,280 from base of 



