174 Journal New York Entomological Society. [Voi. xxv, 



(liiicolatus Lee.) is also quite marked, but the latter is narrower, fully 

 to more than twice as long as wide, with better defined elytral vittse, 

 and with the posterior coxal processes more closely appressed to the 

 ventral surface. 



Hydroporus dilatatus new species. 



Broadly ovate, shining, thinly pubescent, flavo- to rufotestaceous ; elytra 

 with heavy black markings of the undiilattis type ; antennje, legs and under 

 surface entirely pale. Head more distinctly alutaceous and less shining than 

 the prothorax and elytra, finely punctate, impressions moderate, clypeus feebly 

 thickened. Prothorax rather narrowly margined at sides, which are nearly 

 straight ; punctuation moderate, subevenly distributed, the punctures sepa- 

 rated by more than thejr own diameters as a rule ; a small, somewhat diffuse 

 dark spot at the middle of the apical margin, and the basal margin narrowly 

 infuscate in middle half. Elytra one third longer than wide, margin con- 

 tinuous with that of the prothorax, slightly prominent at the humeri, thence 

 straight and parallel or even faintly sinuate to a point just before the middle, 

 broadly arcuately convergent and somewhat pointed posteriorly ; punctuation 

 similar to that of the prothorax, fuscous markings predominant, and so disposed 

 as to leave an irregular subbasal pale fascia which broadens out at the margins, 

 and on the disk is made up of transversely confluent longitudinal spots or dashes ; 

 a similar postmedian fascia and apex pale. The suture is entirely dark and 

 the lateral margins are pale throughout. Metasternum and coxal plates rather 

 coarsely, evenly, not densely punctate, the first two abdominal segments punc- 

 tured nearly as the coxal plates, following segments gradually, more finely 

 punctate ; prosternal anterior intercoxal protuberance obsolete. Front tarsi 

 moderately dilated, only very slightly more so in the male, in which the ante- 

 rior claw is a trifle shorter, stouter, and feebly sinuate internally. Length 

 4 to 4.4 mm. ; width 2.2 to 2.35 mm. 



Maryland (Bladensburg, September 21 — type c? — Sherman) ; Mas- 

 sachusetts (Tyngsboro, August 31-September 5, Blanchard) ; New 

 Hampshire (Farmington, August 21). 



I have used for this species Zimmermann's MS. name, which is 

 attached to a specimen in the Cambridge Museum. Mr. Sherman's 

 specimens were taken in running brooks at Bladensburg, Maryland. 

 Mr. Blanchard and I have taken it in a small meadow brook at Tyngs- 

 boro, Mass. ; and the New Hampshire specimens were taken by the 

 writer in the Cocheco River, a small clear stream with gravelly bed. 



This species may be recognized by its broad ovate form, shining 

 surface and rather distinctly contrasting markings (except in var. 

 snffiisa). Spnrius Lee. (pdfatus Sharp) is similar in form, size and 

 markings, and at Tyngsboro, Mass., and Farmington, N. H., occurs 



