OF WASHINGTON, VOLUME XIX, 1917 



1.31 



was nearly in its original state so that the margins were lined 

 with a considerable accumulation of dead reeds matted together 

 with a very wet algal growth, among which this beetle, with occa- 

 sional specimens of Hydroscapha, was slowly crawling about. 

 Larvae, apparently of Epimetopus, were also collected but were 

 lost in the fire a few days later at Williams, Arizona, which un- 

 fortunately destroyed the bulk of our alcoholic material from the 

 Hot Springs. The specimens now before us were all preserved 

 dry and in the washing and remounting operations, most of the 

 females have lost their egg-sacks (cf. Sharp, 1874, p. 248) so that 

 we have almost no biological material and this (the egg-sack) is 

 to be described in a work on Hydrophilid biologies by Mr. E. A. 

 Richmond. 



FIG. 1. 



FIG. 2. 



In regard to the mode of life of our only previously known 

 species of this genus which as far as we know comes from a 

 single locality, viz., Bosc Co., Texas. The senior writer remem- 

 bers having seen a letter from Theo. Belfrage to Dr. John L. 

 LeConte in which he states that the species occurs not infrequently 

 at the swampy margin of rivers, in company with the usual ri- 

 parian coleopterous fauna such as Tachys, Tachyusa, Stenus, 

 Bledius, Heterocerus, etc. We know of no specimens except 

 those collected by Belfrage, but Dr. Sharp 1882 records it from 

 two localities in Guatemala. 



Of the seven species now comprising the genus four are Ameri- 

 can and three are Asiatic, but only the two United States species 

 have been seen by us; four of the other five species appear to be 

 described from unique examples. In contrasting their descriptions 

 the following table of species was drawn up, the most salient dif- 

 ferences being taken from the characters there stilled, and their 

 comparative value in this table may not be trustworthy. The 

 three Asiatic species appear to be not congeneric witli the Ameri- 

 can forms, apparently having a different type of pronotal lobe 

 and more pronounced elytral tubercles with inHnlliV luster. 



