THE IMMATURE STATE OF THE ODONATA. 31 
lower angle produced in tooth, inner edge sharply denticulated. Movable 
hook, sharp, bent, not reaching base of opposite one. Prothorax small. 
nearly as broad as occiput, notched in front; median line impressed ; front 
angles produced and sharp. Processes long, not very sharp, not much sep- 
arated ; posterior half as long as anterior. Legs short, of nearly equal 
length, middle legs reaching seventh segment; femora somewhat bent. 
Wing cases nearly reaching segment five. Abdomen broad, rounded above, 
rounded off rather abruptly beyond seventh segment. Segments of nearly 
equal length, tenth shortest, almost smooth ; eight dark points on each seg- 
ment, as in B. pratense. Stout lateral spines on segments four to nine, 
smaller on four and five. Lateral spines on segment nine only one third 
length of tenth segment. Appendages stout, blunt, one half longer than 
segment ten. Lateral inferiors cut obliquely at tip; middle a little notched 
on tip, as long as inferiors. Lateral superiors cylindrical, strong, pointed, 
somewhat more than half the length of middle one. Female valve reach- 
ing end of segment nine. There are in the collection two very young male 
nymph, 20 and 22 mm. lone ; 
g; one from Medford, Mass., very similar to the 
above. Antennx six-jointed, male projection just indicated, conical, flat, 
shorter than the lateral superiors. 
The peculiar features, unusual number of joints of antenne, etc., were strong 
reasons for referring it, even before it was raised, to Epizeschna Heros, which 
is the largest species living in this country, and differs so considerably from 
other species as to form a new genus. 
ZESCHINNA ?? 
Body stout, short, broad in proportion. Head, length half breadth. 
Eyes in anterior half of head, orbicular, rather small comparatively, pro- 
longed at inner hind angles in narrow and extended lobe. Antenne five (2), 
Jointed, third joint longest. Mask extending to middle legs, small compar- 
atively ; middle third of foreborder produced in cleft lobe, having a small 
tooth on each side of cleft. Legs strong, long, and with femora notched at 
upper edge ; hind legs more separated at base than fore and middle legs. 
Abdomen rather rounded behind than tapering ; tenth segment enclosed 
in ninth. Dorsal spines on all segments; lateral spines on all segments. 
Appendages short, stout. sharp on tip; middle one blunt. Male projection 
conical. 
This curious nympha was referred to Gomphina at first, with which it 
