Sept, 1903.] Letcher: Phryganidia Californica. 125 



vergent lines of development, but give merely the degree of progress 

 in two particular lines of specialization arbitrarily selected. The 

 figures, however, are interesting to one who knows these species by 

 sight — even surprising — especially in the Libellulinai, where they 

 seem to support no one's theory of the interrelationships of the 

 genera. 



PHRYGANIDIA CALIFORNICA, /'.-/6'A'^v^Z>. 

 Bv Beverly Lktchkr. 



Had the general excellence of the account of the life history of 

 this moth as set forth by Vernon L. Kellogg and F. J. Jack (Proceed- 

 ings of the California Academy of Sciences, second series, Vol. V, 

 1895, P^g^ 562) been maintained throughout their article, there would 

 hardly have been occasion for the present but with them critical obser- 

 vation seems to have ceased with the pupal stage. Other differences 

 are slight but as they are of some interest, may be noted. 



To afford a ready comparison of the head measurements, they have 

 been tabulated, those of Kellogg and Jack appearing in the first column 

 and those of the writer in the third. Little value can be attached to 

 the several durations of stages in the fourth column as they were made 

 on larvae subject to the artificial surroundings of the study : they are 

 from observations of the summer brood while those of Messrs. Kellogg 

 and Jack were made on wintering larvae. 



A practical agreement is to be noted for the ist, 2d, 3d, 4th and 

 5th stages. My observations show a stage supplemental to the ist and 



