Ije Caaailian mnt0m0la0bt. 



Vol. XXXII. LONDON, SEPTEMBER, 1900. 



No. 9 



CONTENTS. 



Sanderson — Larva; of Don.Tcia 249 



French — Parasite supposed cause of cases of 



Epilepsy , . . 263 



Webster — Harpalus caliginosus a strawberry 



pest, etc 265 



Dyar — Life-history of Dichogama Retiten- 



bacheri 271 



Fletcher — Larva of Grapta J-Album 273 



Bird — New histories in HydrcEcia 276 



Dyar — Note on the genus Dyaria, Neuin. . . . 284 



Osborn — Two new species of Jassida; 285 



Correspondence — H. H. Lyman 286 



C. E. Grant 2S7 



THE LARVAE OF DONACIA PISCATRIX, LAC, AND CRAS- 



SIPES, FAB.* 



BY E. DWIGHT SANDERSON, NEWARK, DEL. 



Though the larvte and life-histories of several species of the 

 Chrysomelid genus Donacia have been described more or less fully by 

 European entomologists, I have been able to tind but one such note in 

 American entomological literature. In 1877 ^^- ^- S- Packard gave a 

 brief description of the larva and life-history of Donacia cindicornis, 

 Newm., var. proxiina, Kby., in the report of the L". S. Geological Survey 

 for that year (p. 806), together with figures of the larva and cocoon 

 (PI. LXX., figs. 17-19) which he found on the roots oi JViiphar advefia. 



Recently I have been fortunate in being allowed to study the 

 Chrysomelid larva? in the collection of the LT. S. National Museum, and 

 among them was glad to find several species of this genus and Hiemonia, 

 which with it form the tribe Donaciince. Specimens of eggs, larvfe and 

 pupse of Donacia piscatrix and larvae of Hcemonia nigricortiis are both 

 present from the Detroit and St. Clair Rivers, collected, I judge, by 

 Messrs. Hubbard & Schwarz, and larvae of D. semicuprea, D. crassipes, 

 and H. zosterce from Europe. The larvte of Donacia piscatrix and 

 crassipes I have found so very similar that they may be described 

 together without mentioning the minute points of difference. 



Several very distinct or typical shapes exist among Chrysomelid 

 larvae, which to a certain extent are characteristic of different tribes. 

 Such are (i) the short, inflated larvae of Chrysomela and its allies ; (2) 

 the case-bearing Cryptocephalinae and Clythrini, with their recurved 



*Read before the Entomological Society of Washington, May 3r(l, 1900. 



