June, I9I3-] ROBERTS: NOTES ON HaLIPLID.E OF AMERICA. 117 



Male and female types from Staten Island, N. Y. (Roberts), in 

 my collection. 



Other localities from which I have seen specimens are Cam- 

 bridge (U. S. National Mus.) and Tyngsboro (F. Blanchard), Mass.; 

 Fairfield Co., Conn. (Roberts) ; Camden Co., N. J., and Washington, 

 D. C. 



Named for my very good friend and enthusiastic co-worker in the 

 Dytiscidse, Mr. John D. Sherman, Jr. 



The presence of the subhumeral spot at once separates this spe- 

 cies from mnticus, and the remarkable production of the joints of the 

 middle tarsi in the male distinguishes it from any of those species 

 having the posterior femora black or unicolorous. 



Peltodytes sexmaculatus n. sp. 



0\al, greenish yellow, spots round, well separated. 



Size: length 3J/2 mm.; width 2^/2 mm. 



Head narrow between the eyes ; eyes large, round, prominent ; antennae 

 pale yellow ; finely, evenly punctured with the punctures slightly finer on vertex. 



Pronotimi finely, evenly punctured except a small discal space impunctate ; 

 punctures scarcely larger than those of the head with a few coarser ones 

 placed in the small black basal spots. 



Elytra elongate oval, eleven striate, with the fourth stria interrupted ante- 

 medianly ; apices, viewed from above, subsulcate the exterior angle being 

 quite sharp and slightly produced with the interior rectangular ; strise com- 

 posed of coarse punctures, blackened, except those of the loth and iith striae, 

 gradually reduced in size towards the apex, but not confused ; maculate with 

 six round spots on each elytron, moderate in size and placed as follows : one 

 antemedian, two below this one at about the median line, the exterior sub- 

 lateral and the interior subsutural, three below these forming a small tri- 

 angle ; base and suture narrowly margined with black, from suture to humerus 

 and from base to apex. 



Under side color of upper. 



Prosternal process broadest at base, strongly constricted just beyond the 

 front coxae, very little broader at apex than at point of constriction, margined 

 at the sides and apex, the side margin basally being somewhat thickened ; 

 confluently punctured and wrinkled between the margins. 



Mid-metasternum margined, slightly impressed along the margins interi- 

 orly, margins nearly parallel and somewhat thickened between the middle 

 coxae, confluently punctured at base and with a few fine punctures near the 

 margins. 



Hind coxal wings with small, evenly placed, not deep punctures ; apices 

 evidently subangulate. 



Posterior leg with the femora dark brown basally, deepening to almost 

 black apically, and with the apex of tibia black. 



