1909.] NATURAL SCIENCES OF PHILADELPHIA. 465 



The only previous Calif ornian records of the species are from Los 

 Angeles County and Indio. 



iEoloplus tenuipennis Seudder. 



A single male of this species was taken at Summit House, September 

 3. The measurements — length of body 16 mm. ; length of pronotum 

 3.5; length of tegmen 13; length of caudal femur 8.3 — are slightly 

 larger than those of the type as given by Seudder. 



The record of this species from Tucson, Phoenix and Yuma, Ari- 

 zona, made in a recent publication by the authors, 16 requires correction 

 when comparison of the Summit House specimen of typical tenui- 

 pennis is made with the Tucson, Phoenix and Yuma specimens, all 

 formerly placed under that name being richly and contrastingly colored 

 individuals of M. arizonensis. 



The only previous published records of this species are from Port 

 Grant (type) and Bill Williams Fork, Arizona. 



iEoloplus arizonensis Seudder. 



This species appears to be the commonest one of the genus over a 

 considerable extent of country, ranging from southeastern Arizona 17 

 to southern Nevada and the Colorado Desert. The California and 

 Nevada series before us consists of seventy-seven specimens distributed 

 as follows: Indio, July 29, twenty-seven males, twenty-six females; 

 Cima, August 12, two females; Las Vegas, Nevada, August 10, ten 

 males, twelve females. This species exhibits a remarkable amount 

 of variation in size and considerable diversity in coloration; sometimes, 

 however, a series from one locality will be more uniform in this respect 

 than an equally large one from another region. The Las Vegas series, 

 while showing the instability of the species in these two respects, 

 averages smaller and is more uniform than the Indio series, which 

 shows great diversity in both sexes. Some have the body very pale 

 buffy without distinct markings save on the femora, while others 

 have the stripes on the head and pronotum moderately distinct, the 

 ground color varying greatly in depth. The femoral bars are dis- 

 tinct in all the specimens, but the color of the caudal tibiee may be 

 purplish (solferino, rose purple, lilac or heliotrope purple), pale glaucous, 

 a mixture of the two or some one of several tones of either. 



The Las Vegas series has rose purple or a shade of it the predominat- 

 ing color of the caudal tibiae, while the Indio series has glaucous the 

 color in all the specimens. The two Cima specimens are quite small 



16 Proc. Acad. Nat. Sci. Phlla., 1908, p 394. 



17 See above under JE. tenuipennis. 



