CALANDRIDAE. 511 



2. Body not depressed, beak not dilated at tip. 3. 

 Body depressed, beak dilated at tip ; antenna! inserted near the tip, 



grooves descending rapidly. Cossonus. 



3. Antennje inserted near the middle of the beak. 4. 

 Antennae inserted near the tip of the beak; funicle stout, club mode- 

 rately small. Macrorhyncolus. 



Antennse inserted near the base of the beak; body very narrow. 



Macrancylus. 



4. Antennal grooves descending obliquely. 5. 

 Antennal grooves directed towards the eyes. Allomimus. 



5. Body pale, very elongate ; funicle slender, club large. Stenomimus. 

 Body black, less elongate; funicle gradually stouter, club large. 



Caulopbilus. 

 Body black, less elongate ; funicle very stout, club small. Mesites. 



Macrorliyncholus is found in California; Cossonus extends 

 across the continent; tlie otlier genera belong to the Atlantic 

 region. 



Tribe III.— RHYXCOLISfl. 



The genera of this tribe while diflering from those of the Cos- 

 sonini only by having the prosternum very narrow between the 

 coxae, and by having a deep transverse gular groove beneath in 

 front of the eyes, exhibit other characters which show a strong 

 approximation to the Scolytidaj; thus the number of joints in the 

 funicle of the antennee varies so as to be barely of generic value; 

 the beak becomes very much shortened, and the head compara- 

 tively larger, as in Stenoscclis; the form of the club varies, be- 

 coming w^edge-shaped, truncate, and spongy at tip in Wollastonia, 

 thus recalling the form seen in Rhyiichophorus, etc.; quite rounded 

 or perhaps a little transverse in Stenoscelis. The form is also 

 that of certain Scolytida^. Ilhyncolus resembles closely one sec- 

 tion of Hylastes, while Stenoscelis has altogether the appearance 

 of Hylurgops (//. rugipennix, etc.). 



As in the Uhynciiophora, from the nearly perfect representation 

 of past and present forms, there are almost always intermediate 

 genera to be found, so in the i)resent tribe Phlceophagus seems 

 to be one of such intermediates, and would be in jdace in the pre- 

 ceding tribe, did we hot regard the approximate front coxse as 

 having greater systematic value than the longer beak and the 

 weaker gular groove. 



The antennal grooves always commence near the tip of the 

 beak and descend oljliquely below the eyes. 



