i8 ANNALS OF SCOTTISH NATURAL HISTORY 



TRINEURA, Mg. 

 r. (4.) Hind tibiae with only one outer bristle on the basal half. 



2. (3.) Fore tarsi much dilated ; mid tibiae with five to seven 



outer bristles in ^ and three in 9 , larger species. 



velutina, Mg. 



3. (2.) Fore tarsi hardly dilated ; mid tibiae with about five outer 



bristles in $ , and two or three in 9 aterrima, F. 



4. (i.) Hind tibiae with two outer bristles. Schineri, Beck. 



The species of this genus may always be known by their velvety- 

 black colour, even in the net. 



Velutina, Mg., is common almost everywhere, as is 

 aterrima, F. I meet with them in almost every con- 

 signment of Phoridce that reaches me from corre- 

 spondents. 



Schtneri, Beck, is the scarcest of the three, but I have 

 a good series taken near Bonhill, and I have seen it 

 in the collection of Mr. Henderson, also from Clyde. 



HYPOCERA, Brms. 



This genus is distinguished from the other genera with reclinate 

 post - antennal bristles, and two horizontal rows of four frontal 

 bristles by the absence of the second vein. There are several 

 well-defined sections in the genus which, while lending themselves 

 to easy divisions, seem to point to the fact that they are not con- 

 generic. It is, however, not desirable to increase the number of 

 sub-genera beyond the present number merely to separate one or 

 two species, more particularly when the present genus is not ex- 

 tremely bulky. 



Table of Species. 



1. (2.) Third thick vein with several large bristles at the base. 



mordellarici) Flu. 



2. (i.) Third thick vein without large bristles, or with a single 



bristle. 



3. (6.) Frons with a distinct ocellar tubercule. 



4. (5.) Fore tibiae with from two to four bristles in a row. 



incrassata, Mg. 



5. (4.) Fore tibiae with only one bristle. carinifrons, Ztt. 



6. (3.) Frons without a tubercule. 



7. (8.) Hind legs very stout, no bristle at base of third thick vein. 



femorata, Mg. 



8. (7.) Hind legs long and slender, a large bristle at base of third 



thick vein. 



