1953 ] 
Young — Water Beetles 
23 
apparently occupy the same position as the sulcus seen in 
major and horni. Below these punctures there is a vague 
longitudinal ridge above the epipleura. Venter: Metas- 
ternum slightly more coarsely and irregularly punctate 
than the elytra. Hind coxal plates with very large punctures 
separated from one another by less than their own diameter 
and in part confluent (punctures much coarser than those 
of elytra; about as coarse as those of elytra in indianensis) . 
Two basal abdominal sternites with a few coarse punctures ; 
other sternites with microsculpture but not conspicuously 
punctate (two basal abdominal sternites very coarsely and 
confluently punctate in indianensis). Terminal abdominal 
sternite mucronate but without a median ridge (with a 
blunt projecting ridge and not strongly pointed in the 
female type of indianensis). Epipleurae with some coarse, 
irregularly spaced punctures. Anterior and middle tarsi: 
Moderately strongly dilated. Anterior protarsal claw 
slightly broader and blunter than its fellow. Genitalia: 
Similar to those of compressus and pustulatus, but with the 
parameres more evenly rounded at the tips, and with the 
aedeagus with the constricted apical portion relatively 
longer, stouter, and less strongly curved down at the tip. 
Color: Head nearly uniformly reddish brown. Pronotum 
with disk dark reddish brown and the lateral margins 
lighter; base and apex somewhat darker, but no lighter 
cross-bar between them as in indianensis. Elytra dark red- 
dish brown, each with a transverse sub-basal yellowish 
brown spot which reaches the lighter margin at the side 
but does not attain the suture, a postmedian yellowish 
brown spot, and the apices yellowish brown. Venter red- 
dish brown with the metasternum and hind coxal plates 
darker. Color pattern similar to that of indianensis but 
differing in the narrower sub-basal spot and the larger 
postmedian spot, as well as in the lack of a light cross-bar 
on the pronotum. 
Allotype female: Similar to the male but somewhat 
more regularly oval, somewhat darker in general color, the 
elytra less polished and with the anterior and middle tarsi 
less strongly expanded. Total length 2.93 mm. ; greatest 
width 1.97 mm. Width at base of pronotum 1.62 mm. ; 
