HYDROMETRID^E. 559 



The extension of the Connexivum long and narrow. Sp. 1, 2. 

 The extension of the Connexivum short and triangular. Sp. 3 6. 



Species 1. HYDROMETRA PALUDUM. 



GEERIS PALUDUM, Fab. E. S. iv, 188, 2 (1794); Schum. Beitr. 29, 1, t. 4, 

 figs. 3, 513 (1832) ; L. Duf. Rech. 71, 2 (1833) ; 

 Curt. B. E. xii, 553, 1 (1835) ; H. Schf. Norn. Ent. 

 , 1, 62 (1835) ; Am. et Serv. Hm. 417, 1 (1843). 

 H^DROiiETitA PALUDUM, Fab. S. K. 258, 3 (1803) ; Burm. Handb. ii, 210, 

 1 (1835); Zett. las. Lap. 281, 1 (1840); 

 H. Schf. Wanz. ix, 67 & 70, t. 300, fig. 926 

 (1850); Flor, Rhyn. Liv. i, 732, 1(1860); 

 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- 

 tennae 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, obtuse 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. AntenncB black ; 1st joint almost as long as all the others 

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

 Ocelli and Rostrum black. 



Thorax. Pronotum ; anterior region flat, with a short, yellow, 

 longitudinal line in front; middle region slightly widened to the 

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

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

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

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

 scutellar process convex, the margins narrowly flattened. Elytra 

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



