Casey — A Revision of the American Paederini. 247 



for a short distance to the rather broadly arcuato -truncate base; pro - 

 thorax less than three-fifths as wide as the head, distinctly elongate, the 

 sides subangularly rounded at apical two-fifths, the base nearly twice 

 as wide as the apex, the surface slightly elevated along the middle ; 

 elytra quadrate, parallel, as long as wide, equal in width to the head, 

 slightly longer than the prothorax and very much wider, the surface 

 rather depressed, somewhat coarsely, very densely, rugosely and granu- 

 larly punctate, the suture not at all margined; abdomen at base as 

 wide as the elytra, still more coarsely, closely and rugosely punctate, 

 the last two segments becoming much more finely so and with the side 

 margin greatly reduced, the segments not impressed at base. Male 

 with the fifth ventral unmodified, the sixth with an abruptly formed, 

 subparabolic emargination, deeper than wide, about a third as wide as 

 the apex, with its bottom broadly rounded; ligula of the seventh white 

 in color and submembrauous, subcylindric, slender, with the apex 

 slightly expanded and truncate; female having the sixth ventral 

 obtusely and evenly rounded at tip. Length 2.8 mm.; width 0.5 mm. 

 Mississippi (Vicksburg) and Louisiana (Bayou Sara). 



lndovicianus n. sp. 



The sexual characters are somewhat obscured in the only 

 male at hand by a hardened exudation filling the emargination 

 of the sixth ventral, so that I am not certain of the entire 

 correctness of the description; the white submembranous 

 ligula, however, is clearly defined and is radically different 

 from anything else in the Paederini that I have observed. 



tieptogenius Csy. 



This genus is also represented by a single species thus far, 

 readily distinguishable from the preceding by its still smaller 

 size and more slender form , small eyes which are setulose and 

 not nude, oblong, and not orbicular, basally sinuato-truncate 

 head and normal terminal segments of the abdomen ; it may 

 be briefly described as follows : — 



Body minute, slender, subparallel, only feebly convex, densely dull in lustre 

 and closely, somewhat coarsely and rugosely punctulate, pale red- 

 brown in color, the elytra generally darker except toward the sides and 

 base; head well developed, longer than wide, parallel at the sides, the 

 angles rounded, the eyes rather coarsely faceted and at between two 

 and three times their own length from the base, slightly convex and 

 prominent; antennae not quite as long as the head; prothorax small 

 though fully three-fourths as wide as the head, about as long as wide, 

 the sides subangulate and narrowly rounded at apical fourth, the base 



