18 
terisierenden Varianten läßt es wünschenswert erscheinen, einen Orga- 
nismus, der sich wie Hydra so ungemein leicht kultivieren läßt, gele- 
gentlich des Auftretens solcher auffälliger und wahrscheinlich vererb- 
barer Abweichungen zum Gegenstande von Untersuchungen über 
Vererbung bei Organismen mit geschlechtlicher und ungeschlechtlicher 
Vermehrung zu machen. 
Wien, II. Zoologisches Institut, im August 1913. 
4. Gregarines from some Michigan Orthoptera!. 
By Max M. Ellis, University of Colorado. 
(With 8 figures.) 
eingeg. 16. August 1913. 
During the month of July 1913, three species of gregarines were 
collected from Orthoptera taken in the vicinity of Douglas Lake, at the 
University of Michigan Biological Station. Of the several species. of 
Orthoptera examined the following were found to contain gregarines, 
Melanoplus luridus (Dodge), Melanoplus femur-rubrum (De Geer), Me- 
lanoplus bivittatus (Say), Ceuthophilus maculatus (Say), Ceuthophilus 
latens Scudder, and Ischnoptera pennsylvanica (De Geer). 
Gregarina longiducta sp. nov. 
Hosts, Ceuthophilus latens Scudder and Ceuthophilus maculatus 
(Say); Douglas Lake, Michigan; det. Dr. Paul S. Welch. 
Habitat, Intestine. 
Primite. Primite shorter than the satellite in all associations ob- 
served; length of the protomerite 2 to 3 in the length of the deutomerite; 
width of the protomerite about equal to or a little less than the length 
of the deutomerite; protomerite broader than long rather oval in outline, s 
in some specimens with a slight concavity in its anterior end, (see fig 5). 
Deutomerite rather cylindrical, varying to barrel-shaped, widest towards 
the anterior end, its greatest width usually 0,75 or more of its length. 
Epicyte thin and flexible over the entire gregarine; sarcocyte scarcely 
if at all visible in the living animal; endocyte very dense, black by trans- 
mitted light and a milky white by reflected light, completely obscuring 
the nucleus. 
Satellite. Longer than the primite, to which it is broadly joined, 
otherwise much the same; posterior portion of the deutomerite tapering 
gradually, its margin broadly rounded. 
Associations. Average associations 800 to 900 u; practically all 
of the individuals above 300 in association; smallest association noted 
1 Contribution trom Univ. Michigan Biol. Station Nr. 15. 
