LeConte.] COSSOXIXf. 837 



1. G-. lutosus, n. sp. 



Dull pitchy b'ack, without lustre, and clothed with a thin crust of dark 

 color. Head and beak very coarsely rugosely punctured. Prothorax 

 coarsely granulate, each granule with a central puncture; disc with two 

 broad shallow grooves, or rather with three fine but not prominent carinfe. 

 Elytra with shallow oribrate grooves, inte: spaces narrow, carinate, alter- 

 nately a little more elevated. Benea h very coarsely punctured; antennae 

 testaceous. Length 2.5 mm. ; .10 inch. 



Haulover, Florida, March 16th; Messrs. Hubbard and Schwarz. A very 

 singular insect, of which I hope more specimens may be obtained than the 

 single one I have examined. 



Tribe II. COSSOXINI. 



I would associate as a distinct tribe certain other genera, which have not 

 the body covered with a crust, but shining and bare; some of the foreign 

 genera are more or less setose, but ours are glabrous. 



The beak is never very short, and is frequently dilated at tip; the anten- 

 nae are inserted near the tip, or at the middle; the antenna! grooves fre- 

 quently descend rapidly on the sides of the beak, and sometimes are di- 

 rected towards the eyes, but the antennae are not received in repose in a 

 deep transverse gular groove as in the next tribe. The club varies in form, 

 and in our genera the funicle is 7 -jointed: whether any of the genera of 

 other countries, with less number of joints in the funicle, belong to the 

 tribe as here constituted, must be determined by subsequent investigations. 



The arrangement here proposed differs radically from that offered by Mr. 

 Wollaston, and, if found in accordance with natural affinities, will result in 

 a great reduction of the number of genera. 



The genera I recognize in our fauna are as follows: 



Body not depressed, beak not dilated at tip.. 2. 



Body very depressed, beak not dilated at tip, HOMALOXENUS. 



Body depressed, beak dilated at tip; antennae 



inserted near the tip, grooves descending 



rapidly COSSONUS. 



2. Antennae inserted near the middle of the 



beak 



Antenna} inserted near the tip of the beak; 



funicle stout, club moderately small. . . M ACRORH YNCOLUS 

 Antenna; inserted near the base of the beak, 



body very narrow M ACR ANC YLUS . 



3. Antennal grooves descending obliquely. 4. 



" directed towards the 

 eyes ALLOMIMUS 



4. Body pale, very elongate; funicle slender, 



club large STENOMIMUS. 



Body black, less elongate: funicle gradu- 

 ally stouter, club large CAULOPHILUS. 



Body black, less elongate, funicle very 



stout, club small ". MESITES. 



PROC. AMEIl. PUH.O8. SOC. XV. 96. 2^ 



