(Page 608) 

 into a series of coordinate smaller genera: Etheothassa , Fhloeostiba , 

 X ylodromus , Phloeonomus , Omaliun, Phyllodrepa . flapalaraea. Acrolocha , 

 Pycnoglypta and Acrulea . The most similar elements are thereby collect- 

 ed and separated from less closely allied species. 



Key to Species. 



1. Antennae at base reddish-yellow 2. 



Antennae at base pitch-black or dark, distally toward tip occasionally 



brownish 5. 



2. The constricted neck of the head densely or very densely punctated; 3. 

 The constricted neck of the head with simple punctation 4. 



3. The impressions of the forehead before the ocelli rounded, foveiform; 



the temples obliquely rounded off; abdomen somewhat glistening. 



L. 3.5-4 mm 1. 0. rivulare Payk. 



Impressions of the forehead before the ocelli short linear; temples 

 very short, suddenly constricted; abdomen dull. L. 3-3.5 mm.... 

 2. 0. e eptentrionls Thorns. 



4. Head and pronotum almost smooth; elytra very finely punctated, dul- 



ly shining. L. 4-4.5 mm 3. 0. laeviusculum iyllh. 



(Page 609) 



4. Head, pronotum and elytra rather robustly punctated, these glistening. 



L. 3.5-4 mm 4. 0. rlparium Thorns. 



5. Temples of the head especially short, nearly obsolete, suddenly con- 



stricted. e# 



- Temples of the head about as long as the diameter of the eye, smooth- 



7 

 ly rounded off 



-50- 



