2 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 121 



The species Dineutus analis described by R6gimbart (1882) from 

 Texas was not defined so clearly. It was characterized as follows: 

 oval, slightly narrowed anteriorly; bronzed above; reddish black 

 below, sides of the next to last abdominal segment and the last 

 segment entirely rufous; male anterior femur unidentate. R£gimbart 

 compared the four specimens (two males and two females) from which 

 he described the species with D. americanus (Say) (=D. assimilis 

 Kirby) and D. emarginatus (Say). 



Roberts (1895) redescribed D. analis from 20 specimens, from 

 "Hab.-Texas," and called attention to the serrulate elytral apices 

 that R6gimbart did not include. Roberts also compared D. analis 

 with D. serrulatus LeConte, separating the two by stating that 

 D. analis was less convex, more bronzed above, with a different 

 outline of the elytral apices, a weaker femoral tooth, finer serration 

 of the elytra, and with undersurface dark brown. Roberts' key 

 separated D. serrulatus and D. analis essentially by the difference 

 in color of the venter. 



Since the papers by RSginibart (1882, 1884, 1892, 1902, 1907) 

 and Roberts (1895), only Hatch (1930) and Young (1954) have 

 compared the two species. The portion of the 1930 paper by Hatch 

 concerning these species is principally a key. Young discussed the 

 species of Dineutus in Florida and stated (pp. 148-150) that he did 

 not recognize D. analis among his Floridian specimens. He further 

 stated that he might have mixed D. analis with D. serrulatus and 

 that some specimens identified as D. analis were to him indistin- 

 guishable from D. serrulatus. 



R6gimbart in his 1882 description of D. analis overlooked the 

 elytral serration in this form as he did also in the case of D. carolinus 

 LeConte, when he synonymized that species with D. emarginatus 

 (Say). Roberts, in redescribing the species, cleared up these over- 

 sights and the concepts of Roberts became those of R6gimbart in 

 his later papers (1902, 1907). At the same time, Roberts' interpreta- 

 tion of D. serrulatus delimited that species as being the form with 

 reddish-brown venter and toothed male profemur found in Florida. 

 In deciding this, Roberts used specimens only from Florida for the 

 latter form and specimens only from Texas for D. analis. 



Recently, specimens from drainage ditches in southeastern Missouri 

 were found to run to D. analis in the keys of Roberts and Hatch, 

 but the male and female genitalia were those of D. serrulatus (figs. 1, 

 2). Further study of the species of Dineutus in North America revealed 

 that this population extended from eastern Texas north to south- 

 eastern Missouri and south to western Florida, where it intergraded 

 with D. serrulatus. 



