266 [December, 



21 (22) Very few tiny bristles or hairs outside the rows of orbital bristles on 



frons. Prosternum bare. Ovipositor armed with spines 

 .... 16. veterrima Ztt. 



22 (21) Numerous tiny bristles on frontal orbits. Prosternum with tiny 



bristles on each side-margin. 



23 (24) Silvery-grey species with interfrontalia broadly reaching- front of 



frons and almost confluent with frontal orbits. No facial keel 

 between antennae. Acrostichals only biserial in front 



.... 20. virgo Villen. 

 21 (23) More yellowish-grey species with interfrontalia very pointed in front 

 and with a long very narrow wedge of the dull black frontalia on 

 each side. A narrow but distinct facial " keel'' between antennae at 

 base. Acrostichals quadriserial in front 



.... 19. inaritima v. Rod. 



25 (20) Interfrontalia normal. Face short and remarkably narrowed between 



vibrissal angles 17. aediiuni Villen. 



26 (19) Frontal stripe narrower opposite front ocellus than it is beyond 



middle. Frontal orbits at middle of frons less than half the width 

 of frontalia. 



27 (28) Acrostichals strong and biserial with the rows clo:-e together. Facial 



orbits not narrower than third antennal joint 



.... 14. biseriata Stein. 



28 (27) Acrostichals at least quadritierial, usually very fine and hair-like, 



when some are strong the facial orbits are very nariow. 



29 (30j An absolutely bare stripe the wliole length of thorax between the 



outer (rather strong) acrostichal bristles and the row of dorsoceutrals. 

 Facial orbits not half as wide as third antennal joint 

 .... 18. hmnilis Zett. 



30 (29) Thorax with scnttered hairs on the whole space between the rows of 



dorsocentral bristles. Facial orbits wider. 



31 (34) Middle tibiae with 1-2 distinct auterodorsal bristles. 



32 (33) Jowls more than one-lhird as deep as the eye. Larger darker species. 



Interfrontalia slightly shining in some lights. Middle tibiae usually 

 with two auterodorsal bristles 



.... 7. insularis, sp. n. 



33 (32) Jowls about one-quarter as deep as the eye. Smaller greyer species. 



Interfrontalia dull. Arista more distinctly pubescent. Middle 

 tibiae with usually only one auterodorsal bristle 

 .... 8. curata, sp. n. 



34 (31) Middle tibiae without auterodorsal bristles. 



35 (36) Abdomen with large, broad, sharply differentiated, brown patches on a 



light greyish ground 15. solitariana, n. n. 



36 (36) Abdominal patches small and often not sharply differentiated from 



ground-colour. Arista more distinctly pubescent. 



37 (38) Greyer species. Thorax with narrow brown stripes. Ovipositor with 



distinct, hairy, terminal lamellae 



.... 11. vana Zett. 



38 (37) Darker species. Thorax without distinct stripes. Ovipositor without 



hairy terminal lamellae 12. marina, sp. n. 



