Coleopterological Notices, V. 501 



SOGNORUS Reitter. 

 Ctenistes Lee. nee Reieh. 



There is apparently but little doubt that the American species 

 separated under this name by Reitter should be considered generic- 

 ally distinct from Ctenistes, for, apart from the radically different 

 structure of the antennse, the second joint of the maxillary palpi is 

 very much more slender and elongate in the former than in the 

 latter. The fact that the difference of antennal structure evinces 

 itself principally in one sex does not by any means deprive it of 

 significance in the present family, where sexual characters fre- 

 quently become of generic import. Sognorus is truly very closely 

 allied to Ctenistes, but I think that the characters given must 

 compel us to treat it for the present as a valid genus. 



The species of the United States may be known as follows : — 



Smaller species, not exceeding 1| mm. in length. Atlantic and Gulf regions. 

 Appendiculate processes of the maxillary palpi short, not longer than the 

 width of the joints. 

 Blacker ; elytra not as long as wide ; antennae shorter ; pubescence 



sparse piceus 



More testaceous or ferruginous, the pubescence denser shorter and more 



squamiform ; antennae longer COllSOl)rinilS 



Appendiculate processes very long, about twice as long as the width of the 

 joints ; antennae very slender, more incrassate toward tip, the last joint 

 stouter and subequal to the four preceding together in the male. 



z i m 111 e rman n i 

 Larger species, never less than 2 mm. in length. Arid regions of Arizona and 

 northern Mexico. 

 Antennae more slender, the fifth joint in the male shorter than the fourth, 

 though one-half longer than wide ; last two joints of the maxillary 

 palpi gradually and greatly produced at the sides, with the apical 

 appendage short. 

 Eyes small, from above about one-fourth as wide as the interocular sur- 

 face and situated at one-half their length from the base ; body stout. 



Southern California pulvereilS 



Eyes very large and prominent, one-half as wide as the interocular sur- 

 face, the tempora very short ; body narrower and less robust. 



ocularis 

 AMtennse long hut much stouter, the fifth joint in the male much shorter 

 than the fourth and but slightly longer than wide ; last two joints of the 

 maxillary palpi abruptly produced at the sides in a much shorter process 

 bearing a short apical appendage ; eyes large, prominent, about one-third 

 as wide as the interocular surface ; elytra longer, with more oblique sides 

 and narrower humeri albruptlis 



