AiisJ^ist — December 1SS9.] 



PSYCHE. 



241 



ensis. Still others, while but little more 

 widely diffei"entiated are considered as 

 distinct species ; there are many of these 

 but a few will answer for illustration, 

 Eurygaster alternatits and E. maii- 

 rus^i Neottiglossa undata and N. in. 

 jflexa^ Triphleps insidlosus and T. 

 niger^ Cixius piiii-Awd C. stigmatictcs^ 

 and Deltocephalus debilis and D. ab- 

 dominalis. The first series may probably 

 have been introduced from one faunal 

 region to another, but the two latter 

 series naturally lead us to look back to 

 a common preglacial ancestor whose 

 descendants in the second series have , 

 in accomodating themselves to their 

 changing environments, undergone a 

 similar modification in the diflerent re- 



gions, or have exhibited greater stability 

 in resisting these changes. In the third 

 series the change has been a little — 

 sometimes only a very little — more per- 

 ceptable. 



In Psyche v. 5. p. 311-214, Mr. C. 

 VV. VVoodworth, in an intei-esting and 

 instructive paper on the genera of the 

 North American typhlocybini, sajs he 

 has not recognized a single European 

 species of the group from this country; 

 he seems to have been unaware of the 

 fact that Kybos smaragduhts occurs not 

 only throughout the northern states and 

 Canada but even as far west as Califor- 

 nia from whence I have recently receiv- 

 ed examples from Mr, Coquillett. 



SYNOPSIS OF THE ODONATA OF NORTH AMERICA, No, i 



BY HERMANN AUGUST HAGEN, CAMBRIDGE, MASS. 



Since iS6i,when my Synopsis was 

 published by the Smithsonian Institu- 

 tion, I have, of course, studied these 

 Odonata. The specimens described in 

 my first work we're never less than 

 three years old, mostly over twenty, 

 some nearly sixty. During my resi- 

 dence here I have always tried to com- 

 pare fresh specimens, and if possible to 

 describe living ones. There are very 

 few of which the old types could not be 

 studied again with new specimens. Of 

 the species described since 1861 I have 

 seen the types or had sufficient informa- 

 tion by the authors themselves. The 

 localities are given here always as com- 

 plete and detailed as possible. 



Tribe I, Agrionina. 

 Eyes distant ; antennae four-jointed ; 

 wings equal ; abdomen cylindrical, 

 slender ; accessory male-genitals with 

 the anterior hamulus connate ; penis and 

 vesicula separated ; female genitals 

 vaginate. 



Sub-family, CALOPrERYGiNA. 



Antecubital veins numerous. 



Calopteryx Leach. 

 Wings broad, densely reticulated ; 

 pterostigma absent in the male ; in the 

 female absent, or very small, or irreg- 

 ular, areolate ; basal space without 

 transverse veins ; quadrangular space 



