170 Journal New York Entomological Society. [Vol. xxv. 



poms) of which I have specimens sent many years ago by Mr. Sher- 

 man, and bearing label " Peekskill, June 19, 1890," quite probably 

 taken under similar conditions. Laccophiliniis is larger and broader 

 and evidently less convex than sylvanus; there is less disparity in the 

 size of the elytral punctures and the females are opaque and more 

 finely punctate. 



HYDROPORUS. 



Hydroporus triangularis new species. 



Strongly elongate, convex, pointed behind, shining, subglabrous, the disk 

 with very short and sparse appressed hairs, and along the side and near the 

 apex a few long, excessively fine flying hairs. Color throughout yellowish 

 testaceous, head slightly darker, elytra with brownish fuscous markings as 

 follows : a transverse posteriorly convex basal spot, a broad subparallel-sided 

 fascia at middle and another somewhat narrower subapical one, the two con- 

 nected along the suture. Antennae of moderate length, intermediate joints 

 gradually thickened in both sexes, the fifth joint in the male enlarged, trian- 

 gular, the outer edge sinuately oblique, the apical edge at right angles to the 

 antennal axis. Head evenly convex, lateral impressions subobsolete, clypeus 

 not thickened, punctures fine and very sparse on an excessively finely, densely 

 punctulate ground. Prothorax slightly more than twice as wide as long, sides 

 arcuate, very finely margined, the margin not thickened anteriorly ; surface 

 like the head very densely, minutely punctulate with scattered larger punc- 

 tures. Elytra minutely reticulate and finely, sparsely punctate. Body beneath 

 finely, sparsely, rather feebly punctate, the punctures coarsest on the meta- 

 sternum, becoming very remote, fine and feeble toward the ventral apex. 

 Prosternum gradually declivous in front, the median carina nearly attaining 

 the front margin ; metasternum grooved at summit ; coxal lines parallel. 

 Anterior tarsi narrowly dilated, scarcely wider in the male, in which the claws 

 are unmodified. Length 3.75 to 4 mm.; width 1.75 to 1.9 mm. 



Wisconsin (Sauk City) 4 S's, 6 ?'s. Specimens sent by Mr. Sher- 

 man are said to have been collected by Mr. W. S. Marshall. This 

 remarkable species, though close to the one which follows, is other- 

 wise very distinct from any other in our fauna. 



Hydroporus pilate'i new species. 



Closely related to the preceding species, differing as follows. Fourth and 

 fifth antennal joints in the male conspicuously enlarged, the fifth larger than 

 the fourth, longer than wide, the outer (posterior) edge rounded in apically, 

 instead of sinuately produced to form an acute angle. The apical margin of 

 the prothorax is infuscate, the punctuation of the upper surface even finer 

 and sparser than in triangularis j the lower surface virtually impunctate in 

 the usual sense, though with the same excessively fine, dense punctulation 



