494 Memoirs on the Coleoptera 



very remote and inconspicuous squamules; beak in the female thicker 

 and more arcuate, also more strongly sculptured than in the same sex 

 of simulator, and as long as the head and prothorax, the antennae behind 

 the middle; prothorax narrower, longer than wide, the parallel sides 

 rounding more gradually from anterior third to the tubulate apex, which 

 is fully two-thirds as wide as the base; punctures nearly similar; elytra 

 between two and three times as long as wide, evidently wider than 

 the prothorax and two and one-half times as long, otherwise as in the 

 preceding throughout and, similarly, with a very feeble sinuation at 

 each side of the rounding apex as in Limnoharis. Length (9 ) 2.15 mm.; 

 width 0.55 mm. Colorado (Greeley), — Wickham. One specimen. 



Coming from the same source and locality as the types of simu- 

 lator, I hesitated a long time before deciding to separate this as a 

 distinct species, but the different form of beak, much narrower and 

 more elongate prothorax, with more gradually rounded sides 

 anteriorly, as well as the much smaller size and still more slender 

 outline of the body, seemed to be decisive. 



The species named Limnoharis tenuis — inadvertently published 

 in the erroneous form " tenua" — by Mr. Blatchley, possibly belongs 

 to this genus, but I have not seen it. 



Limnobaroides Chmp. 

 This remarkable genus serves to show how large and complex 

 groups may and often do refuse to lend themselves to consistent 

 systematic treatment. Judging by the temperate fauna of North 

 America, for instance, there could be no doubt that a division on the 

 visibility of the pygidium in both sexes is entirely natural and 

 clearly cut, but in Limnobaroides, we have a genus that combines the 

 characters of the two subdivisions mentioned, for in no known 

 instance among the northern species, do male prosternal spines — 

 a purely Centrinid character — appear in species having the pygidium 

 exposed and vertical in both sexes, but in Limnobaroides this aberrant 

 character suddenly appears in well developed form. The genus is 

 purely tropical, extending from southern Mexico to the Amazon. 

 The following is a hitherto undescribed species from the former 

 region : 



*Limnobaroides sculpturatus n. sp. — Very stout, oblong-oval and 

 convex, feebly shining, deep black, the legs obscure rufous, the prosternal 

 spines testaceous, long, slender, evenly curved and extending somewhat 

 beyond the head; vestiture above consisting of sparse, slender, rather 

 long and conspicuous squamules, wanting in a large medial pronotal 



