EUMERUS. 109 



2 (5) Wings more or less hyaline, without 



inf uscated markings ; second abdo- 

 minal segment without broad yellow 

 spots ; thorax of male more or less 

 cyaneous, clothed with dense silvery 

 hair. 



3 (4) Second and third abdominal segments 



entirely covered with dense silvery 

 hair, the usual lunulae therefore not 

 visible ; male genitalia protruding 

 in the form of a sphere divided in 

 the middle ; pterostigma dark yel- 

 lowish coloured paula, Hery.-Baz. 



4 (3) Second and third abdominal segments 



with the usual pubescence, the 

 lunuljB being clearly visible ; male 

 genitalia concealed : pterostigma 

 colourless serratus, sp. n. 



5 (2) Wings with distinct fuscous borders 



to the cross-veins; second abdo- 

 minal segment with two broad 



yellow spots maculipennis, sp. n. 



G (1) Hind femora more or less thickened 

 and strongly toothed at the tips ; 

 species of larger size, over 7 mm. 

 in length ; eyes in male always 

 in contact for a more or. less con- 

 siderable distance; male genitalia 

 rounded, not bilobate, concealed. 



7 (12) Hind femora cylindrical at the tips, 



with more or less well-developed 

 spines, but without a prominent 

 denticulate plate, not Merodon-like ; 

 vertical triangle in the male very 

 narrow, frons in the known females 

 also narrow. 



8 (9) Scutellum with hind margin imi- 



colorous, black ; hind femora in 

 the male bearing near the b.ise a 

 very strong black tooth, almost as 

 strong as in Syritta spinigera; ocelli 

 equidistant armipcs, sp. n. 



9 (8) Scutellum with hind margin yellow; 



hind femora in the male without 

 the basal tooth ; anterior ocellus 

 distant from the others. 



10 (11) Body bluish black, very deeply punc- 



tate, almost wrinkled ; legs in great 

 part bhck ; thorax almost bare on 

 the middle of the back, without 

 bands ; antennae small scaber, sp. n. 



11 (10) Body aeneous black, more thinly 



punctate ; legs in great part yellow ; 

 thorax with a golden pubescence 

 and distinct grey stripes; antennae 

 broad " f e a> } Bezzi. 



