loS 



Probable Damage to the Forest. — While the affected trees, at a 

 casual glance, look dead, and are evidently considered by the set- 

 tler to be killed, it is still an open question whether they are really 

 so. It is true the foliage is gone and the tree must have an im- 

 paired vitality, but as long as the terminal bud remains untouched 

 the tree would partially recover itself in the ensuing spring, unless 

 again stripped of its scanty covering. In this case it is probable 

 death would ensue. What remedial measures can be adopted it is 

 too soon to say. Observations should be carried on for the bal- 

 ance of the season, and I have suggested the propriety of this 

 course to Professor Pumpelly, who is at the head of the North 

 Transcontinental Survey. 



That such an increase of this butterfly is extremely rare, or 

 that if it does occur frequently it is not fatal to the trees, is 

 proved by the otherwise healthy condition of the timber. The 

 number of trees which may be put down as absolutely dead, but 

 yet standing, is very small, and the fallen trees are practically ab- 

 sent, even in the worst districts. I am, therefore, in hopes that 

 the plague is only temporary and the damage more imaginary 

 than actual. 



(Unfortunately my pup^e were killed in transit, by the break- 

 age of a bottle of chloroform, so that I have failed to raise their 

 parasitic contents.) 



TecJinical Notes. — Mr. Henry Edwards has given a good de- 

 scription of the pupa in the Proc. of the California Academy of 

 Sciences, but was not acquainted with the larva- I therefore add 

 a description of the mature form. I have not Mr. W. H. Ed- 

 wards' figure of the male for reference, but know that it must 

 be good. 



Mr. Strecker's figure of the female reminds me of specimens 

 I have seen from California, though it is roughly drawn ; but it 

 does not resemble a single female among those taken on this trip. 

 Indeed, when I first took the female I made the suggestion that 

 we had found a new species, as there was no trace of red. on the 

 secondaries beneath, and the predominant color was black. Not 

 having types before me for comparison, I am unable to deter- 

 mine whether or not the insect now under consideration is 

 worthy of a special name, and I therefore add a full description 

 of both sexes for future reference. 



Description of Imago. — Head and body black above, with 

 white hairs, the latter white beneath. Palpi yellowish, with fringe 

 of black hairs; antennae black. 



$. — Primaries pure white, with jet black markings as follows: 

 Fringes white, a black costal streak, narrowest at the base, extend- 

 ing to the discal vein, at which point it is suddenly bent inwards 

 and extends over the discal vein to the median nervules. A 

 black apical patch deeply three-notched inwardly, and cut square 

 off on the second median-nervule, containing five white spots ; the 



