176 Trans. Acad. Sci. of St. Louis. 



Kraatz as Poly stoma grisea will, however, have to be placed 

 in another genus as previously defined, the body being more 

 convex, the basal joint of the hind tarsi long and the meso- 

 sternal process much longer, attaining the tip of the meta- 

 sternum and closing the gap so characteristic of Mheocharat 

 Emplenota and many other genera of this section of the 

 Aleocharae. It is probable that other species of this genus 

 will be found on our Florida and Gulf coasts, but I have seen 

 none as yet. 



Echochara n. gen. 



This is an isolated type, necessitating a special generic title, 

 as suggested above, for a species originally described by the 

 ' writer under the provisional name Rheochara lucifuga 

 (Annals N. Y. Acad. Sci., VII, p. 288). The middle coxae 

 are subcontiguous, the very finely acuminate mesosternal 

 process being more or less bilaterally compressed and it 

 differs from Rheochara in addition, by the long, acutely angu- 

 late metasternal process projecting anteriorly between the 

 coxae. The tarsi are of nearly the same type as those of 

 Rheohioma and Rheocharella^ but are stouter, more decidedly 

 shorter than the tibiae, with the basal joint somewhat longer 

 than the fifth, though only intermediate in length between 

 the next two and three together. The abdomen differs greatly 

 from either in having the first four tergites impressed at 

 base, successively less strongly, the fourth feebly so, and 

 even the fifth is noticeably and broadly concave, almost as 

 strongly so as the fourth ; these basal impressions differ 

 from those of Maseochara and Emplenota in being strongly 

 punctured. The antennae are of the usual type, with the 

 fourth joint smaller than the fifth, and, as is sometimes the 

 case, the outer sides of the penultimate joints are a trifle 

 longer than the inner, causing the rectilinear apices to be 

 feebly oblique. The eyes are smaller than usual, though 

 still well developed, and are at a long distance from the base. 

 The punctures of the head and pronotum are extremely 

 minute and but little larger than the base of the hairs borne 

 by them ; each is surrounded by a minute incised ring ; those 



