CEDEMERID^E OF BOREAL AMERICA. 387 



than the thorax, but less closely and with denuded slight- 

 ly elevated spots more numerous near the apex. Body 

 beneath moderately closely punctate, sparsely pubes- 

 cent. Length .30-. 48 inch.; 7.5-12111111. 



The male has the fifth ventral broadly but not deeply 

 emarginate. 



Specimens have been collected in Texas and at Cabo 

 San Lucas, Baja California. It will probably be found 

 in Arizona also. 



Microtonus Lee. 



Form slender. Head short, frontal suture distinctly 

 impressed. Eyes rather coarsely granulate, slightly emar- 

 ginate by a canthus under which the antennae are in- 

 serted. Antennae slender, eleven-jointed. Maxillary 

 palpi with the terminal joint cultriform but not long. 

 Anterior tibiae with two small spurs. Middle coxae dis- 

 tinctly separated. Tarsi slender, the penultimate joint 

 scarcely dilated but distinctly lobed beneath. Claws 

 simple. 



I have already adverted to the doubt as to the position 

 this genus should occupy in our system. Mr. Champion 

 has suggested Melandryidae with very probable correct- 

 ness. There will be observed an important character 

 which seems to have escaped notice. The antennae in 

 all (Edemeridae known to me are inserted with a naked 

 base. In Microtonus they are inserted under a canthus 

 as is quite commonly seen in Melandryidae. 



One species only is known in our fauna although six 

 others have been described, mostly from Guatemala. 



Microtonus sericans Lee. New Species, 1862, p. 259. 



Slender, brownish, feebly shining, sparsely clothed 

 with short yellowish hairs with silken lustre. Head 

 coarsely and moderately closely punctate. Thorax trans- 



