THE IMMATURE STATE OF THE ODONATA. 15 
Island, Mr. Pike, one full-grown male and two younger ones in alcohol, to- 
gether with some imagos. Zanzibar, Mr. C, Cooke, ten specimens, male and 
female, in alcohol ; length, 25 to 26 mm. 
Very similar to A. formosus; differing by the two processes above the first 
legs, more blunt, enclosing an obtuse angle; mask narrower, the apical third 
more suddenly enlarged; middle appendage longer, nearly as long as the 
inferiors. 
I had at first the specimens from Zanzibar, considered to belong to A. 
formosus, and the young ones are indeed similar to this species. One male, 
34 mm. long, does not show the male projection; the smallest, 26 mm. long, 
has the wing cases just covering the first segment. Apparently, the char- 
acters are not so well expressed in the young ones; and I consider them 
probably belonging to A. Mauricianus, though this species is not yet received 
from Zanzibar. 
4. ANAX JUNIUS. 
PuatE I. Fic. 2. 
Drury ; Hagen, Synops. N. Amer. Neur. p. 118. 
Nympha, male and female, dry and in alcohol. Length, 40 to o2 mm. ; 
breadth, 10 mm. Locality, Springfield, Mass.; Boston and Cambridge, 
Mass.; Amherst, N. H.; Caledonia Creek and Crown Point, N. Y., Mr. 
J. A. Lintner; New Jersey; Detroit, Mich., Mr. H. J. Hubbard, a large 
number, young and full-grown ; Charleston, S. C.; Pilichody, Mobile, Ala. ; 
St. Louis, Mo., Mr. Ch. V. Riley, Kentucky; N. Mexico; Port de France, 
Martinique. Coll. Mus. Comp. Zoil. 
Very similar to Anax formosus. Differs in having the palpus not so 
straight at tip, with stronger end hooks; processes more obtuse, and enclos- 
ing an obtuse angle, of same size and shape ; lateral appendages having the 
lower end more abruptly pointed than A. formosus, in which it is taperin 
e. 
Male projection notched at tip. Very young specimens, 16mm. long, from 
Springfield and from Detroit, have the palpus cut straight at tip; wing cases 
covering first segment. Besides the numerous specimens in alcohol, there 
are three raised by Mr. Ch. V. Riley and Mr. 8. Henshaw. 
Several specimens from San Diego, Cal., differ in having two black teeth 
in the middle of the comb of the front border of the mask, and the abdo- 
men more bulky and broader. From the same locality and from the same 
collection A. validus was received. Nevertheless, it seems very doubtful 
