IIYDRO.MLTlilNA. 557 



Siib-Div. 2. — IIydrodromica.* 



Section \.— liYUROMETRlNAA 



l^AMiLY 1.— IlYDROMETllID.^ 



Genus 1. — Hydrometra, Fah. 



Long, narrow, stout ; sides subparallel ; above dull, velvety ; be- 

 neath witb very short, appressed, glossy pile. 



Head long, 5-sided ; above curved, beneath flat ; Crov:n Avith 

 parallel sides ; Face triangular, deflected in a curve ; central lobe 

 promiuent, side lobes very short. AntenncB inserted before the eyes, 

 but nearer to the apex of the head than to them, on a small hori- 

 zontal process, filiform, S-jo^nted ; 1st joint longer, but scarcely 

 stouter than either of the others ; 8rd very minute. Eyes large, 

 hemispherical, flattened on the inner margin, inserted close to and 

 projecting laterally beyond the anterior angles of the pronotum. 

 Ocelli inserted between the eyes near the base of the head, incon- 

 spicuous. Nostrum curved, free, reaching to the 1st pair of coxae, 

 4-jointed; 1st and 2nd joints short, stout; 3rd longest, broadest at 

 the base, and tapering onwards ; 4th ^ith the length of the 3rd, 

 acutely pointed : lalrum broad and triangular at the base, then 

 elongate and pointed. 



Thorax. — Pronotum long, 5-sided (not quite so wide as the 

 sternum, the rounded sides of which are visible from above), slightly 

 widened to the hinder angles, which are mostly raised into a 

 tubercle, thence posteriorly triangular ; anterior margin straight ; 

 sides long, often incrassated, the margin turned underneath ; hinder 

 sides a. e. of the scutellar process) long, rounded, convergent to a 

 rounded point ; di.sk deflected forward from the hinder angles, and 

 backward behind them, the 1st oth depressed, its sides parallel ; in the 

 middle a slight longitudinal keel, and usually a hoUow on each side 

 of it ; the sides at the posterior extremity of this region constricted ; 

 the disk behind the anterior region flat-convex, more convex on the 

 scutellar process, but its sides are broadly flattened and horizontal ; 



*Page 11. t Page 40. 



