224 ENTOMOLOGICAL NEWS. | June, 'l8 



P. carpinicola Crawford.- Common on Carpimts caroliuiaiw. May 15 

 to October u. 



P. cephalica Crawford. Washington, D. C, July 1, August 17, 

 E. A. Schwarz. 



BIBLIOGRAPHY. 



CRAWFORD, D. L. 1914. A monograph of the jumping plant-lice or 

 Psyllidae of the New World. Bui. 85, U. S. Nat. Mus.. 186 pp., 

 541 figs. [Records 15 species from the District of Columbia. 

 Among them Hcmitrioza sonchi, new genus and species and 

 Psylla cephalica new species are described from District ma- 

 terial in part.] 



McAxEE, W. L. 1915. Psyllidae wintering on conifers about Wash- 

 ington, D. C. Science, N. S., 41, June 25, p. 940. [Five species 

 discussed.] 



OSTEN SACKEN, C. R. 1861. Ueber die Gallen und andere durch 

 Insecten hervorgebrachte Pflanzendeformationen in Nord-Am- 

 erica. Ent. Zeit. Stettin. 22, Nos. 10-12, Oct.-Dec. pp. 450- 

 423. [Describes Celtis gall and gall maker, Psylla (now 

 Pachypsylla) venusta from Washington, D. C.] 



SCHWARZ, E. A. 1904. Notes on North American Psyllidae, Part I. 

 Proc. Ent. Soc. Wash., 6, No. 4, Nov., pp. 234-245, figs. 6-12. 

 [Describes Calophya flavida new species and records C. niyri- 

 pcnnis Riley, from the vicinity of Washington, D. C.] 



Life History and Habits of Gastroidea caesia 



Rog. (Col.) 



By MILTON T. GOE, Portland, Oregon. 



These beautiful, little, dark-green beetles are to be found in 

 countless numbers in and around Portland, Oregon, from the 

 latter part of March until late in autumn. Plants of the Dock 

 species, Rum ex crispus and Rnmcx obtusifolins, are their fa- 

 vorite hosts, and on bright, warm days both adult and larva 

 may be found feeding upon the leaves of these plants; but 

 during cold or rainy days they take shelter in the ground near 

 where they are feeding. From my observations, I find of the 

 two Rumcx species, they prefer obtusifolins. The adult beetle 

 and the larva both feed greedily upon the leaves of these 

 plants ; the larvae eat the parenchyma off the upper and under 

 surface of the leaves, but are more often found on the under 

 side. The adults are even more devastating than the larvae, 



