86 



again specimens occurred which were almost typical chalcedona. Mr. 

 Jas. Cottle of San Francisco, who was at Dunsmuir at the time, stated 

 emphatically that these larvae differed from those of chalcedona he 

 had collected at San Francisco. 



It is evident then that we have two larval forms ; one lacking the 

 dorsal and lateral pale stripes and producing an imago almost wholly 

 black and yellow which frequents the low lying coast land particularly 

 around San Francisco and feeds on Scrophularia species ; the other 

 very similar, with the addition of a geminate dorsal and a lateral pale 

 stripe, found on Pentstemon species throughout the whole Sierra 

 range at moderate altitudes and producing an imago with generally 

 well defined red marginal spots and often red spots in the discal cell ; 

 we imagine they are merely forms of a single species, the differences 

 in both imago and larva being due largely to environment but they cer- 

 tainly represent good geographical races and as such should be kept 

 separated. For the former the name chalcedona (not chalcedon as 

 generally written) will be used; for the latter we believe the correct 

 name to be dwinellei Hy. Edw. ; this was described as a variety of 

 chalcedona (Pap. I, 51, 1881) from McCloud fishing station at Baird, 

 Shasta Co. and specimens of our bred series from Siskiyou Co. have 

 been compared with the type and agree exactly; the red suffusion of 

 the yellow spots mentioned in the description is not nearly so marked 

 in the types as one would be led to suppose but the red marginal 

 spots are well defined and the specimens as a whole cannot be separ- 

 ated from a series from Truckee, the type locality of macglashani 

 Rivers. Dwinellei Edw. will have priority over this name in our 

 opinion but if desired macglashani may be employed for the Truckee 

 form which is scarcely distinguishable but does in general, as noted by 

 Rivers, show a more checkered appearance than either the San Fran- 

 cisco or Shasta Co. specimens ; San Bernardino specimens are also 

 very close to macglashani; it is possible that specimens from the 

 coast region of southern California may approach typical chalcedona 

 but this is a point for our entomological enthusiasts on the spot to 

 settle as we have no authentic material from this region before us. 



Wright figures what we consider almost typical cJwlcedona as 

 colon (PI. XVIII, Fig. 154) his quino (Fig. 155) is also we think the 

 same species; his chalcedona (Fig. 157) is the San Bernardino race, 

 almost inseparable from macglashani which is correctly figured (Fig. 



