2G6 COLEOPTERA OF NORTH AMERICA. 



Tribe IV.— ANTHICIK I. 



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 eniar- 

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

 dilated ; the middle coxa? are nearly contiguous in other genera, 

 but absolutely so in Tanarthrus ; the hind coxa? are 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 in 

 our genera, 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. Notoxus. 



Thorax not prolonged over the head ; 



Antenna? nioniliform ; thighs thickened. Tomodeeus. 



Antennae not inoniliform ; 



Body without wings ; humeral angles rounded. Foemicomus. 



Body winged ; humeral angles distinct. Anthicus. 



11th joint of antennas elongated, almost divided into two. Tanaetheus. 



The species are numerous ; the genera, except Tanarthrus, are 

 represented on the Atlantic district, but thus far no species of 

 Tomoderus has occurred in the Pacific region. The differences 

 between the second, third, and fourth genera seem to me rather 

 indefinite. Tanarthrus, besides the elongated 11th joint of the 

 antennae, and contiguous middle coxae, is farther remarkable for 

 having the elytra shorter than the abdomen, and subtruncate at 

 the extremity. The genus contains but two species, from the 

 Colorado Desert, one of which, T. salinus Lee, flies and runs on 

 salt mud, after the manner of a Cicindela. The species of Notoxus 

 live on flowers and leaves ; those of Anthicus are very numerous ; 

 some are found on plants, but the greater number live near the 

 •margin of water, especially in sandy localities. 



Fam. lix.— pyrochroidae. 



Mentum trapezoidal, narrowed in front, supported by a 

 large gular process ; ligula large, prominent, bilobed, labial 

 palpi 3 -jointed. 



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