IIYDROMETRID/E. 559 



The extension of the Connexivum long and narrow. — 8p. 1, 2. 

 The extension of the Connexivum short and triangular. — fcSp. 3 — 6. 



Sjjccics 1. — Hydrometra paludum. 



Gerris paludum, Fad. E. S. iv, 1S8, 2 (179i); Sc/mni. Bcitr. 29, 1, t. 4, 



figs. 3, 5—13 (1S32) ; L. Luf. Rech. 71, 2 (1833) ; 



Curt. B. E. xii, 553, 1 (1S35) ; H. Schf. Nom. Ent. 



1, 02 (1835) ; Am. et Serv. Hem. 417, 1 (1843). 



Hyurometka paluduji, Fab. S. 11. 258, 3 (1803) ; Btirm. Haudb. ii, 210, 



1 (1835); Zeit. Ins. Lap. 281, 1 (1840); 



H. Schf. Wanz. ix, 67 & 70, t. 300, fig. 92G 



(1850); Flor, Rliyn. Liv. i, 732, 1(1800); 



Fieb. Europ. Hem. 106, 2 (1861). 



Above brown-black ; beneath blueish-gray, silvery in certain aspects^ 

 slightly shining. Head with a whitish line at the sides. An- 

 tennac black ; 1st joint almost as long as all the others together. 

 Pronotum slightly widened to the hinder angles, the sides there 

 raised into a dwarf, obtnse tubercle ; disk nearly flat, with a fine 

 central raised line ; scutellar process convex ; the under-curved 

 sides of the middle region yellow. Elytra brown-black ; nerves 

 black ; Connexivum narrowly yellow-brown on the margin, 

 the long terminal spines reaching rather beyond the genital 

 segments, directed upwards, the sides projecting at the base, the 

 points slightly convergent. 



Head long ; sides with a whitish line ; base with a short transverse 

 yellow line going obliquely from the middle towards the middle of 

 each eye. Antennce black ; 1st joint almost as long as all the others 

 together; 4th rather shorter than the 2nd. Eyes black, shining. 

 Ocelli and Bostrum black. 



Thorax. — Pronotum; anterior region flat, witli a short, yellow, 

 longitudinal line in front; middle region slightly widened to the 

 hinder angles, sides sharply defined, at the hinGor angles raised into 

 a dwarf, obtuse tubercle ; the under-curved margins with a yellow 

 line of equal width throughout ; disk slightly convex, finely creuate 

 punctate, obscured by the pile, and with a fine central raised line ; 

 scutellar process convex, the margins narrowly flattened. Elytra 

 brown-black, as long as the abdomen (sometimes abbreviated) ; 



