MADEIRAN COLEOPTERA. 197 
559. Stenus undulatus. 
Stenus undulatus, Woll., Ins. Mad. 599 (1854). 
Inhabits Madeira proper; occurring (principally amongst the 
Marchantia polymorpha) in damp spots, at the edges of the waterfalls 
and trickling streams, at intermediate and lofty altitudes,—and 
descending in the north of the island to a comparatively low ele- 
vation. Rare. 
§ IT. Abdomen immarginatum : tarsi articulo quarto bilobo. 
560, Stenus hydropathicus, n. sp. 
S. niger, crebre et valde profunde punctatus, parce subargenteo- 
pubescens, prothorace obovato, elytris breviusculis subventricosis, 
antennis, palpis pedibusque testaceis, femoribus ad apicem tibiisque 
versus basin nigrescentibus. 
Mas, abdominis segmento sexto subtus in medio triangulariter exciso. 
Fem. adhue latet [forsan abdominis segmento sexto eodem acute 
rotundato (utin S. cicindeloides) |. 
Long. corp. lin. vix 24. 
S. black, very slightly shining, and rather sparingly besprinkled 
with a short and somewhat silvery pile. Head and prothorax 
rather closely, and exceedingly coarsely punctured; the former 
somewhat flattened, with a very abbreviated longitudinal ridge 
immediately behind the insertion of either antenna, and with the 
palpi pale testaceous ; the /atter obovate, and unchanneled, Hlytra 
rather short and subventricose (being a little rounded at the sides, 
and rather more convex than in the other species here enume- 
rated), and with the sutural line rather broad and conspicuous. 
Abdomen conical and unmargined, and a good deal narrower than 
the elytra even at its base. Antenne, palpi, and the legs, bright 
rufo-testaceous; the femora at their apex, and the basal region of ~ 
the tibice, being more or less black. 
Male, with the sivth segment of the abdomen beneath triangularly 
cut-out (or emarginated) in the centre. 
Female, probably (as in the European S. cicindeloides) with the same 
segment somewhat acutely produced at the same point (instead of 
emarginated) ; nevertheless having as yet detected only two males, 
I am unable to say this for certain. 
Two specimens of the present addition to our Fauna were captured 
by myself, durimg the summer of 1855, in the north of Madeira 
proper,—one on the dripping rocks alongside the first large waterfall 
on the coast-road between Sao Vincente and Seisal; and the other 
in a somewhat similar situation, at the edges of a trickling stream 
which finds its way over the lofty perpendicular cliffs between 
