190«J.] NATURAL SCIENCES OF PHILADELPHIA. 451 



Trimerotropis oalifornioa Bruner. 



This interesting species is represented by a series of twenty-eight 

 specimens from the following localities: Pasadena, July 14, 1898, 

 F. Grinnell, Jr., two males; Pasadena, August 1, 1907, nine males, 

 seven females; Los Angeles River, August 24, one male, one female; 

 near Rubio Canyon, San Gabriel Mountains, 1,000 to 1,600 feet, 

 August 8, four males, two females; Altadena, August 8, one male; 

 summit Cahon Pass, September 9, one male. There is a moderate 

 amount of variation in size and also a great deal in coloration, although 

 the latter is chiefly in the depth of the pattern. Some individuals 

 have the tegminal bars poorly contrasted, but in all they are fairly 

 well defined, though made up of annuli in some individuals. There is 

 some individual variation in the width of the tegminal bars and in 

 the number and position of the quadrate annuli in the apical portion. 

 One of the Pasadena females is entirely suffused with ferruginous, 

 others are partially so, while some are quite dull and others hoary- 

 white. The Cahon Pass specimen is a typical individual, in a grayish 

 type of coloration seen in a pair from Claremont. The wing-band 

 varies to an appreciable extent in width and also somewhat in 

 position. 



The species was nowhere really plentiful and was found to be local 

 in distribution, restricted usually to dry places, particularly in the 

 Arroyo Seco at Pasadena. Although moderately vigorous it was 

 more difficult to find than to capture. 



This species has been recorded from San Luis Valley, Claremont, 

 Los Angeles and Ontario, California. 



Trimerotropis strenua McNeill. 



This Great Basin and interior desert form is represented by four 

 males from the Mohave desert and the region to the north, two taken 

 at Cima, August 12, on a plateau of tree yucca, one at Cottonwood, 

 September 9, and the other in the foothills of the Bird Spring Moun- 

 tains, Lincoln County, Nevada, August 11. 



The Cima specimens are inseparable from Salt Lake City individuals, 

 but a tendency toward call) arnica is noted in the Cottonwood speci- 

 men. The latter has the wing-band narrower than in typical individ- 

 uals, but the general facies is more distinctly that of strenua than that 

 of californica, although the former is probably nothing more than a 

 geographic race of the latter. 



In action the species was more vigorous than T. californica and is 

 apparently a very much scarcer form. The specimens captured 

 at Cima were taken on the tree yucca plateau among brush. 



