LIST OF AQUATIC COLEOPTERA. 113 
24. — lituratus Fab. Carregado. Villa real. * 
2). —- pubescens Gyll. Portimao, Foya, Villareal. 
26. — decipiens n. sp. Ovalis, crebrius evidenter 
pubescens, sal nitidus, niger, elytris fusco-nigris, basi signaturis 
testaceis, pedibus rufis, antennis fusco-lestaceis, basi testaceo: 
elytris crebrius subliliter, sed evidenter, punctatis; coxis poste- 
rioribus crebrius sat fortiler punctatis; abdomine dense sed 
subobsolele punctato, fere opaco. Long. 3 1/2 — 33/4 mm. 
This species is very closely allied to Hydroporus analis Aubé, 
but is more elongate and the colour of the upper surface is less 
variegate, the testaceous marks on the elytra being limited to their 
base; the 3" joint of the front tarsus is very small, and by this the 
species may be distinguished from Dytiscus planus Fab., to some 
varieties of which it has much resemblance ; the dense sculpture 
of the ventral segments distinguishes it readily from Æyphydrus 
pubescens Gyll. I have seen but few individuals and notice no 
sexual distinctions. 
Found by Camille van Volxem at Monchique, and by myself in 
the Guadarrama. 
27. Hydroporus Bonnairii Farm. Villa real, 15, 6, 71. 
28. Laccophilus interruptus Aubé. Portugal, Monchique. 
29. — testaceus Aubé. Villa real, Portimao, 
Carregado. 
30. Noterus sparsus Aubé. Portugal. 
ol. —— crassicornis Aube. Portugal. 
32. Hydrocanthus notula Er. langer. 
33. Liopterus agilis Fab. Portugal. 
34. Agabus brunneus Fab. Villa real, Monchique, Carre- 
gado. 
J9. — bipustulatus Lin. Cintra, Carregado, Coimbra 
Monchique, Tanger. 
36. — didymus OI. Villa real, Carregado. 
91. — bipunctatus Fab. Villa real. 
38. — n. Sp.? As ] have not yet critically studied all the 
European species of À gabus, I leave without name for the present, 
what I believe to be an undescribed species, found by M. van 
Volxem at Monchique. I have found the same species in the Gua- 
darrama and at Reynosa. 
39. Agabus nitidus Fab. Santa Olalla. 
40. Colymbetes collaris Payk. Portugal. 
4]. —- fuscus Lin. Portugal, Tanger. 
42. — coriaceus Cast. Monchique, Foya. 
