566 CALIFORNIA ACADEMY OF SCIENCES. 



port of the U. S. Entomological Commission, 1890) 

 states that there are two. Packard, in Forest Insects, 

 quotes Mr. Behrens of San Francisco as saying that 

 three generations appear annually. In our year of ob- 

 servation but two generations appeared. Moths were 

 flying in May, 1894, the larvse from whose eggs became 

 full-grown in September, and produced the October 

 moths. From the slowly and irregularly hatching eggs 

 of these moths came the_slow- growing winter brood of 

 larvae which became full-grown in the laboratory in the 

 last of March, but out of doors not until the middle of 

 May. From these came again a late May and early June 

 brood of moths. It is to be noted that the occasional ap- 

 pearance of moths, as, for example, two specimens capt- 

 ured on February 20, 1895, resulting from the more rapid 

 growth and transformation of a few individuals of a brood, 

 is not an unusual phenomenon in the life history of this 

 insect. It may explain, too, some of the unwarranted 

 statements occasionally heard concerning this pest, cred- 

 iting it with five or six annual generations.* 



The descriptions of the egg, larval stages and chrysalid 

 follow. The only illustration of the larva of this species 

 we have seen, that of Stretch, after which the figure for 

 Packard's Forest Insects was made, is a case of mistaken 

 identity, the conspicuous tufts of hair on the figured cat- 

 erpillar having no counterparts on the Phryganidia larva. 



Sg-g- (see a, plate Ivi) — Smooth, spherical, becoming 

 slightly depressed at one pole soon after exclusion, this 

 depression becoming conspicuous in a few days. Diam- 



*Dr. H. H. Behr, in an article entitled "On the power of adaptation in 

 insects," Proc. Cal. Acad. Sci. ser. 2, vol. 5, Aug., 1S95, states that there 

 are four or five generations annually, but after considering again the data 

 at command concludes (as expressed in a private letter) that "Phryganidia 

 has but two regular generations, but under certain circumstances there 

 must develop at least one more." 



