ELISHA MITCHELL SCIENTIFIC SOCIETY. 103 



My Figs. 21, 23, 25 and 26, Plate IV, represent a male which 

 differed from Heterodera radiclcola mainly in the presence of a 

 short curved caudal })rocess represented at a, Fig. 26. At first 

 I thought this might possibly he a different species from Hetero- 

 dera radiclcola, but as I only found one specimen 1 have con- 

 cluded it may possibly be an accidental vai'iation. 



All of the males which I have studied were found in potatoes. 

 My impressions are that the species in all the different galls 

 found here are identical. More than this at the present time 

 could not be said. As this report is only preliminary, and it has 

 been impossible for me during the very short period of my obser- 

 vations to find and carefully study the males, where we must 

 probably look for the most satisfactory specific characters, in the 

 different galls, I hope to continue these investigations during the 

 coming year. This will also afford me an opportunity to study 

 more fully some structural features necessarily passed over in the 

 present work. 



Distribution of Heterodera, — The genus Heterodera is 

 world-wide in its distribution. It has been long known in cen- 

 tral Europe, where Heterodera Schachtii was discovered by 

 Schacht* in 1859 and named by Schmidtf in 1871. Heterodera 

 radiclcola was first recorded in i S7 2 and nmned as Anguillula 

 radiclcola by Greef,J and transferred to this genus by Muller§ in 

 1884. It has been found in Java in the roots of sugar-cane by 

 Treub,|| who named the species Heterodera Javanlca, the char- 

 acters being based on some differences in size of the females from 

 Heterodera radicicola. Beijerinck^ doubts if it is distinct from 

 Heterodera radicicola. 



*Ueber einige Feinde der Rubenfeldei. Zeitschrft, d. Ver. d. Rubenzuckerindus- 

 trie. Bd. IX, S. 175—179, 1859. 



fUeber den Rnben-Nematoden (Heterodera Schachtii A. S.) Zeitschr. d. Ver, f. d. 

 Rubenzackerindnstrie im ZoUverein. Bd. XXI, S. 1-19, 1871. (Both cited by Mulier, 

 Mittheilungen uber unsei'en Kulturpflanzen schadliche Wnrmer). 



tSitzungsberieht. d. Marburger Gesellsehaft z. Beford. d. Naturwiss. S. 1G9, 1872. (Cited 

 by Mulier, Mittheilungen, etc.). 



gMittheilungen uber unseren Kulturpflansen .schadliche, das Geschlecht Heterodera 

 biidenden Warmer. Landwirthschaltliehe Jahrbucher, Bd. XIII, Heft I, 1884. 



IIQuelques mots sur les etfets du para.^sitisme de 1' Heterodera Javanica dans les racines 

 de la eanne a sucre. Ann. d. Jardin bot. de. Buitenzorg, Vol. VI, Part I, pp. 93-9fi, 

 Leide, 188G. Abstract in Bot. Centralblatt, Bd. XXVIII, p. 269, 188G. 



fThe Gardenir-root disease. Gard's. Chron. ser. Ill, Vol. I, pp. 488, 489, 1887. Abstract 

 in Bot. Centralblatt, Bd. XXXV, p. 92, 1888. 



