i 3 8 THE SCOTTISH NATURALIST 



45 (48). Hind tibia with rows of hairs. 



46 (47). Larger, grey-brown species; pubescence on mid tibia 



very short. 23 incisurata, Ztt. 



47 (46). Smaller, black species ; pubescence looser, becoming longer 



towards the tip. 24 mutica, Ztt. 



48 (45). Hind tibia not remarkably haired. 



49 (5°)- Small matt-black species ; last abdominal segment with two 



small shining knobs on the ventral surface. 



25 parva, Stn. 



50 (49). Rather larger, somewhat shining species; last abdominal 



segment normal. 



51 (54). Calyptra pale, not brownish or black. 



52 (53). Knees broadly yellow; fore tibia with an extra bristle. 



26 genitalis, Stn. 



53 (52). Knees not conspicuously yellow; fore tibia normal. 



27 similis, Stn. 



54 (51). Calyptra dark brownish. 1 



55 (56). Hind femora with a row of bristles increasing in length 



from middle to tip. 28 postica, Stn. 



56 (55). Hind femora with about three long bristles at the tip. 



29 serena, Fin. 



Table of Females. 



1 (8). Legs with at least the hind tibia translucent yellow. 



2 (5). Femora and tibia almost entirely yellow. 



3 (4). Scutellum partly yellow ; small species, 4 to 5 mm. 



3 pretiosa, Schin. 



4 (3). Scutellum unicolorous grey; large species, 8 to 10 mm. 



1 hamata, Macq. 



5 (2). Femora black or brown. 



6 (7). Hind tibia with three or four antero-ventral bristles. 



2 fuscula, Fin. 



7 (6). Hind tibia with one antero-ventral bristle. 



4 p alii tibia, Rnd. 



8 (1). Legs with at most the knees yellow. 



9 (16). Mid tibia with a ventral bristle. 



10 (11). Orbits shining black, entirely undusted. 



19 carbonaria, Mg. 



11 (10). Orbits always with distinct dusting. 



12 (13). Mid tibia with three antero-dorsal, one antero-ventral, and 



one postero-ventral bristle. 20 polychceta, Stn. 



1 Postica, Stn., has sometimes the calyptra yellow, but the armature of hind 

 femora is distinct. 



