570 HYDROMETRINA. 



length sub-equal; 3rd thin, very minute ; 5th long-fusiform. Eyes 

 very large, prominent, hemispherical, almost touching the pronotum. 

 Ocelli near the base of the head, about equidistant from each other 

 and the eyes. Rostrum reaching beyond the 1st pair of COXSD, stout, 

 3-jointed ; 1st joint short, annular ; 2nd long, sub cylindrical ; 3rd 

 |rd as long as the 2nd, acute. 



Thorax. Pronotnm 5-sided, almost rhomboidal, much broader 

 than the sternum ; anterior margin short, straight, sides slightly 

 sinuate, the margins broadly curved under, hinder angles produced 

 above into a rounded tubercle, cut off outwardly in a short straight 

 line ; hinder sides as long as the fore-sides, prolonged to the end of 

 the scutellar process in a slightly rounded line; disk regularly 

 convex, but behind the anterior angles depressed into a large shallow 

 fovea. (In apterous examples the pronotum is sub-trapeziforin, 

 the disk posteriorly shortly deflected to the posterior margin, which 

 is broadly rounded beyond the hinder angles, not produced into a 

 scutellar process, so that part of the inesonotum and the whole of 

 the metanotum are uncovered.) Elytra (generally wanting) ; the 

 nerves forming 4 closed cells, projecting behind the last, but not 

 extending to the apex, curving inwards and forming a posteriorly 

 open, apical cell. Sternum ; the 3 segments of about equal length, 

 so that each pair of legs is about the same distance apart ; Pro- and 

 Mesosternum in the middle depressed into a deep, angulated, wide 

 furrow ; Metasternum convex, posteriorly roundly-triangular ; coxal 

 sheaths large, cylindrical, the 1st and 2nd pairs posteriorly cut off 

 straight ; 3rd pair beneath, produced over the coxa3 ; the 2nd pair 

 wider apart from each other than either the 1st or 2nd pair are, and 

 projecting laterally. Legs stout, not very long ; 1st and 2nd pairs 

 of about equal thickness ; 1st pair shortest, 2nd longest ; coxce 

 stout, short, inserted in a hindwardly oblique direction ; thighs ; 1st 

 pair a little thickened to the apex, longer than the tibia3 ; 2nd pair 

 cylindrical, about the same length as the tibiae ; 3rd pair stoutest, 

 about the same length as the tibiaa, subfusiform, the apex obtuse, 

 cleft (those of the $ much stouter than those of the $ , and on the 

 underside with 2 short sharp spines, and 2 rows of very small teeth) ; 

 tibiae scarcely thickened to the apex ; the 3rd pair in the $ on the 

 inner side, with minute distant teeth ; tarsi ; 1st pair short, stout, 

 1st and 2nd joints short, 3rd longer than the 1st and 2nd together; 

 2nd and 3rd pairs long-cylindrical, 2nd pair longest, 1st joint verv 

 short, 2nd longer than the 3rd ; claws short. 



