Casey — A Revision of the American Paederini. 155 



anterior more or less stronj^ly dilated in both sexes. Palaearctic and 



Nearctic regions. [= Eamona Csy.] Psendomedon 



Body minute in size, feebly, not very densely sculptured, the head and elytra 

 larger than the prothorax; palpi well developed; gular sutures as in 

 Pseudomedon but less widely separated; mentum shorter, strongly 

 transverse; antennae short, unusually enlarged or claviform distally; 

 eyes well developed; neck fully two-fifths as wide as the head; pro - 

 sternum scarcely at all carinate; hind tarsi rather long, very slender and 

 filiform, the basal joint distinctly shorter than the next two combined, 

 the anterior merely thicker, not at all dilated. Regions bordering the 

 Gulf of Mexico Lena 



The European Hypomedon Key, is included for comparison 

 and completeness ; it is undoubtedly distinct from Medon and 

 not a subgenus as stated by Heydeu, Reitter and Weise in the 

 catalogue of those authors. Micromedon (n.gen.) is founded 

 upon the European Medon se7ninigrum, of Fairmaire. It is 

 more closely related to Hypomedon than any other genus, but 

 differs greatly in habitus and in labral structure, as well as in 

 its non-spongiose anterior tarsi and minute eyes. 



Neomedon Shp. 



The genus Neomedon, as outlined by Dr. Sharp in the 

 " Biologia," has the body subdepressed, the labrum short, 

 broad, scarcely or not at all emarginate and minutely trituber- 

 culate at each side, the first joint of the posterior tarsi one- 

 half longer than the second and the anterior slightly dilated. 

 In view of these characters, in connection with the compara- 

 tively large size of the species, and the fact that the genus 

 appears to extend to the northernmost limits of the regions 

 covered by the "Biologia," leads me to believe that the 

 following species, from which the generic diagnosis of the 

 above table is taken, is truly a member of the genus under 

 consideration : — 



Bo'ly St JUt, subdepressed, parallel, black in color, the elytra, legs and an- 

 tennae more or less bright rufous, the surface distinctly shining, with 

 the punctures of the head coarse, rounded and distinctly separated, 

 those of the pronotum finer but almost as close- set and about equal to 

 those of the elytra, the abdomen very minutely and densely punctulate, 

 head large, distinctly wider than long, parallel and straight at the sides; 

 the basal angles rather broadly rounded, the base broadly sinuate; 



