36 SYNOPSIS OF SPECIES DESCRIBED. 



3. A. Mauricianiis Rambur. (Supposition.) 



Nympba, full-grown, male and female, ilauritius Isl. ; Zanzibar. 



Similar to A. formosus ; processes blunt, enclosing an obtuse angle ; mask more suddenly 

 enlarged ; middle appendage nearly as long as inferiors. 



4. A. Junius Drury. (Raised.) 



Nymphoe, full-grown and young, male and female. United States. 



Processes similar to A. formosus, more obtuse at tip, equal in size ; lateral appendages 

 cylindrical, pointed suddenly at tip; male projection notched at tip. 



5. A. Julius Brauer. (Supposition.) 



Nymphse, male and female. Japan. 



Processes and lateral appendages similar to A. formosus; male jjrojection as in A. Junius. 



6. A. GuttatUS Burm. (Supposition.) 



Nymphas, full-grown, male and female. Marshall Isl., Pacific Ocean. 



Body more elongated ; processes inequal, anterior blunt, posterior smaller, angular behind ; 

 enclosing a very obtuse angle, with small median notch ; male projection narrow at tip, cut 

 square. 



7. A. Amazili Burm. (Supposition.) 



Nympha?, full-grown, male and female. Jamaica ; Central America. 



Similar to A. Junius, Init more elongated ; processes of equal length and size, enclosing 

 a very obtuse angle ; lateral appendages sharply pointed ; male projection shorter ; notched 

 at tip. 



8. A. spec. 



Nymphae, male and female. East India. 



Similar to A. Junius ; processes more blunt, posterior smaller, enclosing an obtuse angle ; 

 lateral appendages abruptly pointed ; male projection notched at tip. 



^schna Fabr. 



Body, long, stout ; head large ; eyes very prominent at the forecorner ; mask extending to 

 middle legs, broad, front border slightly produced in round or ol>lique lobe, cleft; legs longer, 

 stouter; abdomen broader; lateral spines on segments six to nine, or five to nine, or four to 

 nine ; appendages long, sharp ; male projection conical ; female valves reaching tip of segment. 



A. Lateral spines on sixth to ninth segments ; no teeth on front border of mask ; lateral 

 ap2}endar/es shorter than the inferiors ; viiddle one notehed at tip. 



9. 2C Rufescens Vander Lind. (Raised.) 



Nymphse, full-grown, male and female. Europe, 



Hind angles of head rounded ; mask large, gradually enlarged ; processes enclosing an 



