Sept., 1903] Needham & Anthony: The Thorax of Odonata. 123 



Vestalin.-e. 



Neurobasis chincnsis 46 39 Calopteryx maculata 54 43 



Mnais strigata 50 40 Helceritia ai7iericana 58 40 



Calopteryx angiistipen/iis 51 35* Lais pudica 59 49 f 



Thorin/e. 

 Thore picta 52 48 Cora inca 59 50 



Fai/i. AGRIONIIX^. 



Lestinj.. 

 A rch ilestes gra ndis 59 38 L estes recta ngu laris 66 48 



Agrionin^. 



Calicnemis atkinsoni 57 51 Disparoneiira vittata 64 55 



Hyponeura lugcns 58 53 Oxyagrion terminate 64 58 



Platycnemis pennipes 61 42 Nehallemiia irene 64 61 



Hemicnemis lyilineata 61 51 Leptagrion macriiritm 65 47 



A mpliiagrion sai/cii/in 62 4 2 '-i^ Enallagma doubledayi 65 48 



Xanthagrion erythroneiinii/i.. 62 47 Protoneiira capillaris 65 53 



Ischniira grcBllsii 62 48 Tclebasis allaiidi 65 53 



Argia violacea 63 59 Ceriagrion glabra in 65 53 



Ceratura capreola 64 48 A canthagrion gracile 65 54 



Mecistogaster sp ? 64 49 Acanihagrion cheliferuni. ... 65 57 



Anovialagrion hastatntn 64 51 Erythragrion salvum 67 45 



Agriocnemispulveriilans 64 55 Aciagrion pallidum 72 62"^ 



The maxima, minima and averages for both angles are given for the 

 subfamilies, of which representatives were studied, in the following 

 table : 



Angle of hu- Angle of tilt 

 meral suture. of wing bases. 



r^SCHNID.'E 

 AnisopteraJ 



Mi. Ma. Av. Mi. Ma. Av. 



'.ESCHINI.N.E 21 42 35 19 34 25 



GOMPHlN.^i 31 50 40 22 29 26 



Petalurin.^ 40 — — 35 — — 



^ cordulegasterin^ 37 — — 35 — — 



I CMacromiin^ 29 39 y^ i8 n 24 



'-LIBELLULID.E ^ Cordui.iin.^ 30 38 35 23 29 25 



i^ LlBELLULIN^ 28 52 41 19 38 30 



* Minima : second column. 

 •f Maxima : second column. 



