synopsis or species di:s( jribed. 



SUBFAMILY CORDULINA. 



LEGIO MACROMIA. 

 Anterior part of the head transformed in <"< erect pyramidal horn. 



DIVISION I. — Palpi narrow, Comb-like, not interlocking. 



1. Epophthalmia ? Burmeister. (Supposition.) 



Nympha skin. Canton, China. 



Body large, stout ; head broad ; wing covers spotted with black ; the very aberrant 

 form of the palpi narrow, comb-like, with very long, not interlocking teeth, separates 

 this species from all others. 



DIVISION II.' — Palpi broad; interiorly denticulate, closely interlocking. 



Macromia Rambur. 



The anterior part of the head just in front of the antenna 1 transformed in a large 

 erect pyramidal horn ; a character unique among the earlier stages of Odonata. 



2. M. transversa Say. (Eaised.) 



Nymphas full-grown, male and female. North America. 



Head saddle-shaped ; abdomen truncate at tip ; no dorsal hook on 10th segment ; 

 lateral spines on 9th segment long ; apical ventral edge of 9th segment hairy. 



3. M. Illinoiensis Walsh. (Supposition.) 



Nymphse full-grown, male and female. North America. 



Head flat above ; abdomen more ovate, hairy ; dorsal hook on 10th segment ; lateral 

 spine on 9th segment as long as the 10th segment; apical ventral edge of 9th segment 

 not hairv. 



