Austin.] 8 [October 25, 



Medium size, antennae thickened externally, joints 8 — 10 strong- 

 ly transverse, 11th short, conical . 4. littoreus Zimm. 



Medium size, antennae slender, as long as the head and thorax, 

 scarcely thickenedexternally, joints 8 — 10 longer than wide 



5. compotens Lee. 

 Smaller species (.20 to .25 in.) 3. 



3. Elytra very short, sparingly punctured with moderate punctures 



6. palustris n. sp. 

 Elytra longer, sparingly punctured with large shallow punc- 

 tures; antennae as long as the head and thorax, slender 



l.floridanus n. sp. 

 Elytra short, densely punctured, particularly on the sides . 4. 



4. Thighs red, with the apical third black; tibiae, tarsi and mouth 



parts dark; antennae thickened, shorter than the head and 



thorax, joints 8 — 10 transverse . 8. nevadensis n. sp. 



Legs and mouth parts red; knees sometimes blackish; antennae 



more slender, joints 8 — 10 not transverse 9. littorarius Grav. 



5. Small species ; elytra sparsely and rather coarsely punctured 



10. ustus Lee. 



6. I have seen no species from the United States belonging to this 



group. P. cceruleipennis Boh. is described as being black, 

 with the elytra blue, and is said to be from California and the 

 Sandwich Islands; but as the localities of insects collected by 

 that expedition are sometimes a little uncertain, it is not un- 

 likely that the species is foreign to the United States. Sev- 

 eral species of this group are, however, found in Mexico and 

 Central America. 



7. I have only seen a single specimen in Dr. Horn's collection, from 



Louisiana, belonging to this group, and merely call attention 

 to the fact in order that collectors may look for similar spe- 

 cies. 



1. Pasderus femoralis Lee. Proc. Ac. Phil., 1858, 62. 



This species is readily distinguished from any known to me by the 

 character given in the table. Arizona. 



2. Paederus grandis sp. n. 



This is closely allied to the last, but has the head more densely 

 punctured; the elytra are greenish instead of blue, and are less 

 densely punctured. The form of the head, however, affords the 



