152 lTemiptera-fTeteroptera. 
intermediate and posterior femora very long, also the tibiee ; 
these vary much in proportions in the different species ; 
tarsi two-jointed ; claws ante-apical. 
We have ten species in this country out of twelve 
recorded as Palearctic in Puton’s Catalogue. They are all 
very much alike in general shape and colour, but there are 
good structural characters in the legs, antenne, etc., by 
which they may be distinguished apart. 
(6) 1. Sixth segment of the abdomen pro- 
duced at each side into a more or less 
elongate spine. 
. More or less ferruginous, first joint of 
the antenne shorter than the second 
and third together (Subg. Limno- 
porus, Stil.) : . RUFOSCUTELLATA. 
(2) 3. Black, first joint of the antenuw longer 
than the second and third together 
(Subg. Hygrotrechus, Stil.). 
(5) 4. Points of the sixth abdominal segment 
projecting as far as or beyond the 
genital segments, lateral margins of 
the pronotum narrowly pale. . PALUDUM. 
(4) 5. Points of the sixth abdominal segment 
shorter than the genital segments, 
pronotal margins concolorous. . NaJas. 
(1) 6. Sides of the sixth segment of the ab- 
domen not spinose, only angular 
(Subg. Limnotrechus, Stal.). 
. Pronotum more or less yellowish on 
the dise. 
(11) 8. Abdomen beneath finely carinated, 
without longitudinal lines in the 
silvery pubescence. 
. Larger and more robust, pale colour 
more rutescent, very wide across the 
intermediate coxa. Costz. 
(9) 10. Smaller and less robust, pale colour 
more flavescent, not very wide across 
the intermediate cox THORACICA. 
(8) 11. Abdomen beneath finely channelled 
down the centre, and also with longi- 
tudinal lines in the silvery pube- 
scence . ASPERA. 
(7) 12. Pronotum entirely black on the dise. 
(14) 13. Lateral margin of the pronotum yellow 
only behind the anterior constric- 
tion. ; P : 5 : . GIBBIFERA, 
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