THE IMMATURE STATE OF THE ODOXATA. 15 



Island, Mr. Pike, one full-grown male and two yonnger ones in alcohol, to- 

 gether with some imagos. Zanzibar, Mr. C. Cooke, ten specimens, male and 

 female, in alcohol ; length, 23 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 Ijelong to A. 

 formosus, and the young ones are indeed similar to this species. One male, 

 3i mm. long, does not show the male projection ; the smallest, 26 nun. long, 

 has the wing cases just covering the first segment. Apparentlj^, 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. 



Plate I. Fig. 2. 

 Drury; Hagen, Synops. N. Amer. Neur. p. 118. 



Nympha, male and female, dry and in alcohol. Length, 40 to 52 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. IL 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. Zocil. 



Very similar to Anax formosus. Differs in having the palpus not so 

 straight at tip, witli 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 tban A. Ibruiosus, in which it is tajiering. 

 Male projection notclied at tip. Very young specimens, 16 mm. 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. S. Henshaw. 



Several specimens from San Diego, Cal., differ in having two black teeth 

 in the middle of tlie comb of the front border of the mask, and the abdo- 

 men more bul]<v and broader. From the same locality and from the same 

 collection A. validus was received. Nevertheless, it seems very doubtful 



