140 MEMOIRS ON THE COLEOPTERA 



between the coxae, expanding to a truncate apex; it is perfectly 

 horizontal and free behind them. The middle coxae are very widely 

 separated. The first ventral segment is as long as the entire re- 

 mainder of the abdomen. The antennae and tarsi are broken off 

 in my single example, which was taken in Kansas. Its dimensions 

 are 0.85 by 0.68 mm. 



Symbiotes Redt. 



The species of this genus differ greatly from those of Rkymbus in 

 their oblong or oblong-oval form. The sublateral sulci of the pro- 

 notum are always broad and deep basally and the vestiture is long 

 and more or less bristling. There is a distinct subsutural stria, 

 sometimes flexed outwardly at base, and the punctures are always 

 distinct and generally though not always serial in arrangement. 

 In 1910 Mr. Blatchley supplied the first description of an American 

 Symbiotes under the name S, duryi Walton MS. (Coleop., Indiana, 

 p. 536). This was followed two years later by the description of 

 S. duryi by Prof. L. B. Walton, with very satisfactory drawings 

 accompanying (Ohio Nat., Feb., 1912, p. 461). As Mr. Blatchley 

 states that his specimen came from Prof. Walton, it is to be pre- 

 sumed that the same material forms the basis of S. duryi Blatch., 

 and S. duryi Walton. As Mr. Blatchley published his description 

 first, the name is to be attributed to him in the records. Still later, 

 Mr. Chas. Dury published two species (Cin. Soc. Nat. Hist.), im- 

 pressus and waltoni, taken in the suburbs of Cincinnati and well 

 characterized by the singular male sexual modifications at the apices 

 of the elytra. On going over the material in my collection I find 

 four distinct species, no one of which can be identified with any one 

 of the three already published, showing that the genus Symbiotes is 

 not only widely distributed in North America, but that it is undoubt- 

 edly one of our largest genera of Endomychidae. 



In the following species the elytral punctures have scarcely a 

 trace of serial arrangement at any part: 



Symbiotes montanus n. sp. Oblong-oval, shining, testaceous through- 

 out, convex, the vestiture not dense but long and bristling, pale in color; 

 head fully three-fifths as wide as the prothorax, minutely, sparsely 

 punctulate; antennae well developed, extending well behind the prothorax, 

 the basal joint large, the second shorter and thinner, third not quite as 

 long as the next two combined, four to eight compact, subquadrate, 



