LEPIDOPTERA 



721 



scaled, sometimes semi-transparent; they are black with a common 

 white band near their middle ; and the discal veins are usually white 

 and broadly bordered with black. There are great variations in the 

 width of the white band on the wings. The larva feeds on the leaves 

 of oak ; it is brownish black, with a lateral yellow stripe ; and is armed 

 on each segment with large, branching, venomous spines. The larva 

 almost always enters the ground to transform. 



The New Mexico range-caterpillar, Hemileuca olivics. — Of the ten 

 western species of Hemileuca this is doubtless of the greatest economic 

 importance. It is a grass-feeding species, which has been very de- 

 structive in certain sections of the cattle-range in northeastern New 

 Mexico. It was estimated that in 1909 the total infested area was 

 at least 15,000 square miles, and that there were an average of 10 

 caterpillars to the square rod over this region. For a full account see 

 U. S. Dept. Agr. Bull. No. 85, Part V. 



Fig. 921. — Pseud ohazis hera. 



Pseudohdzts.— In the West there occur two species of Pseudohazis. 

 These are P. hera in which the ground-color of the wings is white 

 (Fig. 921), and P. eglantenna, in which the ground-color is buif or 

 salmon. Both species are spotted and striped with black as shown 

 in the figure. 



Color ddia pandora. — This is a brownish gray species found in the 

 Rocky Mountains. The wings are only moderately broad, and each 

 ismarked with a small black spot at the end of the discal cell. Thehind 

 wings are semi-transparent. The expanse of the wings is from 75 to 



