26 
NORTH AMERICAN THROSCIDAE 
Var. debilis Horn 
Prostemal striae shorter. This is hardly worthy of a name as it rims into 
sericeus. 
This species varies almost as much as does chevrolati. Some 
specimens of the debilis form are more coarsely punctate above 
and below, and again the smaller specimens of sericeus are fre- 
quently very finely punctate. No sexual characters have been 
observed except the pubescent antennal club and the dilation of 
the hind angles of the pronotum in the male. Var. debilis is 
more northern — Oregon, Washington and Vancouver — while true 
sericeus occurs in Oregon, California, Arizona, New Mexico and 
Colorado. 
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