1921.1 267 



Division II. Cubital vein armed with tiny bristles at least on the nodose 

 iimction with radial vein. 



1 (4) Frotis nearly horizontal and consequently base of" antennae nearly level 



with upper margin of eyes, and the angle formed by frons and face 

 about 90°. 



2 (3) Frons somewhat wider at base of antennae than at vertex. The 



shimmerino- central part of frontalia silvery 



.... 29. riparia Fin. 



3 (2) Frons of almost equal width throughout. The shimmering central part 



of frons more extensive and yellowish-brown 



.... 28. exuta Kow. 



4 (1) Frons more convex and sloping, so that base of antennae is lower and 



angle formed by frons and face is more than 90°. 



5 (G) Thorax with only two broad dark stripes. Arista subplumose 



23. notata Fin. 



6 (5) Thorax with more than two dark stripes. Arista at most pubescent. 



7 (10) Normally only three pairs of postsutural dorsocentral bristles. 



8 (9) Smaller species. Central thoracic stripe not widening out behind 



suture. Scutellum more unicolorous 



.... 21. triangula Fin. 



9 (8) Larger species. Central thoracic stripe usually confluent with side- 



stripes behind suture. Scutellum with distinct dark patches at 

 sides 24. maculosa Mg. 



10 (7) Normally four pairs of postsutural dorsocentral bristles. (If the arista 



is very distinctly pubescent conf. maculosa which sometimes might be 

 included under this section.) 



11 (14) Only rather short fine hairs beneath middle femora. 



12 (13) Thorax slightly shining. Ground-colour of both thorax and abdomen 



not so light grey, and consequently the dark stripes and patches not 

 so sharply differentiated. Jowls about twice as deep as third 

 antennal joint is wide 22. nigripes Dsv. 



13 (12) Thorax dull. Ground-colour light grey, the dark thoracic stripes and 



abdominal patches sharply diflerenti.ited. Jowls more than twice 

 as deep as third antennal joint is wide 



.... 26. exsurda Pand. 



14 (11) Distinct long bristly hairs or bristles beneath middle femora. 



15 (16) Abdominal patches small and rounded; first segment practically 



without dark markings 25. scnipulosa Zett. 



16 (15) Abdominal spots large and broad; first segment extensively darkened. 



Thorax much more unicolorous brown, especially behind suture 

 .... 27. iiniseta Stein. 



In addition to the species dealt Avith in the above memoir it is 

 necessary to refer to a L. meadei Schnabl from Scotland, a name to be 

 found in the ' Zoological Kecord ' for 1916. The identity of this species 



2a2 



