112 H. C. FALL. 



ous, nearly straight, somewhat contorted, gradually tapering to tip, 

 and closely ciliated on their external margin ; the copulatory spicule 

 laterally compressed, curved and more obtusely pointed. In Gynop- 

 terus the lateral pieces are corneous, flattened and arcuate, as viewed 

 from above, widest just before the tip, which is finely ciliate; the 

 copulatory spicule vertically compressed, straight, slender and finely 

 aci culate. 



1. Elytra dissimilar in form in the sexes ; elongate, subparallel in the male ; oval, 



more or less ventricose in the female; fourth ventral segment short; 

 female apterous Subgenus PTINUS. 



Setae of strial punctures well developed, usually more or less bristling 2. 



Setae of strial punctures miuute and contained entirely within the punc- 

 tures 5. 



2. Setae of elytral interspaces equal or subequal in length 3. 



Alternate elytral interspaces with longer erect hairs 4. villiger . 



3. Humeri prominent, sides of elytra nearly straight or even a little sinuate to- 



ward the base 4. 



Humeri small, sides of elytra slightly arcuate 3. bicinctus. 



4. Elytral setae longer, suhbasal and subapical spots of recumbent scales wanting 



in the male, represented in the female by coarse appressed hairs which 

 are present only in the humeral region ; surface of bead polished. 



1. bruimeus. 



Elytral setae shorter, subbasal and subapical patches of pale scales conspicuous, 



especially in the female ; head alutaceous 2. fur. 



5. All the elytral interspaces setiferous 6. 



Interspaces 2-4-6 (at least in the female) nonsetiferous, setfe short and equal 



in length throughout '• 5. alteriial lis. 



6. Eyes very large, elytral setae ( % ) very short and much inclined, the recum- 



bent vestiture squamiform 6. ca?lebs. 



Eyes smaller, elytral setae longer and more erect, recumbent vestiture more 

 hair like 7. 



7. Recumbent hairs relatively dense and more uniformly distributed, fulvous or 



fulvocinereous in color 8. 



Recumbent hairs less uniformly distributed, largely condensed in subbasal and 

 subapical transverse spots, especially in the female, color white or 

 nearly so 9. 



8. Bristles of elytral interspaces erect and not recurved 7. vertiralis. 



Bristles of elytral interspaces inclined and recurved 8. gandolpbei. 



9. Elytral setae ( 9) unusually long ( Southern California) 9. signal u*. 



Elytral setae ( 9 ) much shorter (Middle California, Oregon). .10. COgnatus. 



II. Elytra similar in form in the sexes, oblong, more or less elongate ; fourth ven- 

 tral segment longer; both sexes winged- . .Subgenus GYNOPTERUS. 

 Longer hairs of the elytra excessively developed, nearly as long as the width 



of the prothorax at its narrowest part 11. longive*! is. 



Longer hairs of the elytra much shorter than the width of the prothorax at 

 its narrowest part 2. 



