570 IIYDROMETRINA. 



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

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

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

 and the eyes. Hosfrnm reaching beyond the 1st pair of coxa?, stout, 

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

 ird as long as the 2nd, acute. 



Thorax. — Pronotum 5-sided, almost rhomboidal, much broader 

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

 sinuate, the mai-gins broadly curved under, hinder angles produced 

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

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

 the seutellar 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-trapeziform, 

 the disk posteriorly shortly deflected to the posterior margin, which 

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

 seutellar process, so tliat part of the mesonotum and the whole of 

 the metanotum are uncovered.) Eli/tra (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 

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

 furrow; lletasfernum conxex, posteriorly roundly-triangular ; coxal 

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

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

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

 projecting laterally. Le{/s stout, not very long ; 1st and 2nd pairs 

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

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

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

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

 about the same length as the tibiae, 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) ; 

 tihicc 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 very 

 short, 2ud longer than the 3rd : claxi's short, 



