"21.] 265 



THE BRITISH SPECIES OF THE ANTHOMYID GENUS,^.*-?^ — .^ 



LIMNOPHORA Desv. (DIPTERA). /^^ ^ '^^^%^ 



BY J. E. COLLIN, F.E.S. /^384.52«< 



(Conchided from antea, -p. 24:8.) I DEC 2 * "^^^ ' 



Table of Species (Females). 

 Division I. Cubital vein absolutely bare even on nodose jut 

 with radial vein. 



1 (10) Normally only three pairs of postsuturaldorsocentral bristles on thorax. 



2 (9) A distinct anterodorsal bristle on middle tibiae. 



3 (6) Arista subplumose, tiie lonoest hairs above and below together as 



long as the third antennal joint is wide. 



4 (5) Greyer species without long posteroventral hairs on hind femora 



.... 1. litorea Fin. 



5 (4) Darker species with long posteroventral bristly hairs on hind femora 



.... 10, denigrata Mg. 



6 (3) Arista at most only pubescent. 



7 (8) Head in profile with antennal prominence more projecting and 



angular. Jowls deeper (quite one-third as deep as eye). Facial 

 orbits wider than third antennal joint. Ovipositor armed with minute 

 spines and without conspicuous lamellae 



2. surda Ztt. 



8 (7) Head in profile with antennal prominence more rounded and less 



projecting. Jowls hardly one-quarter as deep as eye. Facial orbits 

 narrower. Ovipositor with conspicuous long-haired terminal 

 lamellae 3. contractifrons Ztt. 



9 (2) No antercdorsal bristle on middle tibiae. Thorax much greyer than 



in any of the above species and with narrow dark stripes 

 .... 4. baltica Ringd. 



10 (1) Normally four pairs of postsutural dorsocentrals. 



11 (12) Interfrontalia brightly shining and reaching to front of frons 



.... 13. a'erea Fin, 



12 (11) Interfrontalia dull, or at least not brightly shining. 



13 (14) Middle tibiae with a distinct anteroveutral bristle. Ovipositor with 



distinct hairy terminal lamellae 



.... 5. brunneisquama Ztt. 



14 (13) Middle tibiae without the anteroveutral bristle. 



15 (16) Arista subplumose, the longest hairs above and below together as long 



as third antennal joint is wide 



.... 10. deniffrata Mg. 



16 (1.5) Arista at most pubescent. 



17 (18) Hind femora with a practically complete anteroveutral row of bristles. 



Middle tibiae with two strong anterodorsal bristles. Largest 

 species of the genus 6, compuneta Wied. 



18 (17) Hind femora with anteroveutral bristles on apical half only. 



19 (26) Frontal stripe (including interfrontalia) wider opposite front ocellus 



than it is beyond middle. Frontal orbits at middle of frons half the 

 width (or more) of frontal stripe. 



20 (25) Interfrontalia very broad and long, occupying greater part of frontal 



stripe. 



2a 



