412 COLEOPTERA OF NORTH AMERICA. 



region to California; otherwise there is no species known to us 

 from tiie Pacific slope. 



Tribe III.— MAtRATRlIXI. 



Two very narrow, brown, pubescent species of Macratria are 

 found in the Atlantic States, on flowers and leaves. 



The head is deflexed, conbtricted far behind the eyes, which 

 are oval, and not at all eraarginate, somewhat coarsely granulaied, 

 and slightly hairy ; the neck is very small ; the epistoma is not 

 separate from the front; the maxillary palpi are comi)ressed and 

 dilated, with the last joint large and securiform; the last three 

 joints of the antennse are longer than the others; the middle coxa^ 

 are distinctly separated; the hind coxai are nearly contiguous; the 

 intercoxal process of the abdomen is very small and acute ; the 

 first joint is longer than the others, and the sixth is visible in the 

 male; the penultimate joint of the tarsi is bilobed; the first joint 

 of the hind tarsi is very long; the claws are suddenly and broadly 

 dilated at base. 



Tribe IV.— AXTHICIIVI. 



Head deflexed, constricted behind the eyes, which are regularly 

 oval, and rather coarsely granulated ; the epistoma is not separate 

 from the front ; the neck is very small ; the mandibles are emar- 

 ginate at tip ; the last joint of the maxillary palpi is moderately 

 dilated; the middle coxae are nearly contiguous in other genera, 

 but absolutely so in Tanarthrus ; the hind coxse arc moderately 

 separated; the intercoxal process is acute at tip, except in For- 

 micomus, where it is broad and obtuse; the ventral segments are 

 five in both sexes; the penultimate joint of the tarsi is bilobed 

 except in Mecynotarsus, and the claws are simple. 



Our genera are: — 



Antennae with the 11th joint equal to the 10th ; 

 Thorax prolonged over the head into a horn ; 



Posterior tarsi not longer than the tibiae. Notoxus. 



Posterior tarsi much longer than the tibiae. Mecynotarsus. 



Tliorax not prolonged over tlie head ; 



Antennae moniliform ; tliighs thickened. Tomoderus. 



Antennae not moniliform ; 



Body without wings ; humeral angles rounded. Formicomus 



Body winged ; humeral angles distinct. Anthicus. 



lllh joint of antenuR' elongated, almost divided into two. Tanarthrus. 



