Sept., 1903. 1 Needham & Anthony: The Thorax of Odonata. 121 



urernents made showed considerable discrepancies and were discarded 

 altogether ; but, with practice, they came into much closer agreement. 

 It is not claimed, however, that the figures herein given are to be re- 

 lied upon absolutely within the limits of two or three degrees. 



Suborder Anisoptera. 

 Fain. ^.SCHNID^. 



.^^SCHNIN.I':. 



X Z X z 



Boyeria Irene 21 19* Staurophlebia magnifica ... 3 6 25 



Anax Junius 27 21 Epiceschna heros 37 23 



^schna californica 34 22 Goinphceschna furci/Iata ...t,"] 24 



CoryphcFSchna ingens 34 25 Gynacantha trijida 39 27 



^schnophlebia anisoptera 35 34f Basiceschna Janata 42 27 



^Eschna verticalis 36 23 Planccschna niultipunctata^z 2 8 



GoMPHIN.«. 



Dromogomphus spinosus 31 25 Lanthus albistylus 42 28 



Gomphus similliinus 2^2 22 Herpetogomphus designatus^\ 28 



Gomphus villosipes t^t^ 26 Ophiogomplius serpentinus.^\ 27 



Gomphoides stigma tus 36 26 Frogomphus obscurus 44 27 



Gomphidia confluens 37 26 Onychogomphus uncatus...jf-i 27 



Aphylla producta 39 27 Epigoniphus paiudosus 47 29 



Hagenius brevistylus 40 2 2-'' PPemigomphus ochraceus 50 297 



Gomphus di la tat us 41 22 



Petalurin^. 

 Tachopteryx thoreyi 40 28 



CORDULEGASTERIN.I-:. 



Cordulegaster diastatops 37 35 



Fam. LIHKLLULID.-E. 

 Macromun^i^. 



Didymops transversa 29 20 Epophtlialmia elegans 33 18* 



Macromia tnagnifica 32 22 Synthemis brevistyla 39 33t 



* Minima : second column, 

 f Maxima : second column. 



