1915] Muttkowski: Studies in Tetragoneuria (Odonata) 
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Antenodals: fore wing (f.w.), hind wing (h.w.), each wing being listed. 
The left figure refers to the left wing, the other to the right. 
Postnodals: fore wing (f.w.), hind wing (h.w.) 
Substigmal series arises at: (referring to second postnodal series arising 
at the nth postnodal of the first series): l.f.w., r.f.w., l.h.w., r.h.w., right 
and left fore and hind wing, respectively. 
Venation; Cu-vein (cubito-anal cross-vein) coincident with A a or dis- 
tal thereto: coin. = coincident, dist. = distal, d/c or c/d = distal in the 
left wing and coincident in the right wing, respectively. T.f.w. = triangle 
of fore wing — crossed or open. 
Length; Abdomen (abd.), appendages (App.), fore wing (f.w.), hind 
wing (h.w.) 
Color; Wings — stated to which type they belong. T-spot — present 
(pres.), absent (abs.), shadowed (shad.) 
In tabulation the specimens were taken in order of numbering. 
The results have been sufficiently summarized under “ Venation’ ’ 
on pages 92 and 93. A comparison of the tables under species, 
or those of different species for any character mentioned will 
make the ascendency in venational characters clear. 
LIST OF SPECIES 
This check-list is intended to supplant that published in my 
Catalogue, pp. 124-127, 1910. 
Tetragoneuria HAGEN 
Type — semiaquea (Burmeister) Distribution — Nearctic. 
Syn. Neur. N. Am., p. 140, 1861. 
BRAUER, Verh. Ges. Wien, 18, p. 370, 1868. 
CALVERT, Trans. Am. Ent. Soc., 20, p. 223, 1893. 
KELLICOTT, Odon. Ohio, p. 86, 1899. 
WILLIAMSON, Drag. Ind., p. 249, 1900. 
NEEDHAM, Bull. 47 N. Y. State Mus., p. 249, 1901; Proc. U. S. 
Nat. Mus., 26, p. 724, 1903; Ann. Ent. Soc. Am., 1, p. 280, 1908. 
MARTIN, Cat. Coll. Selys, 17, pp. 10, 40, 1907. 
MUTTKOWSKI, Bull. Wis., N. H. Soc., 2 (6), p. 103, 1908; Bull. 
Milwaukee Museum, 1, p. 124, 1910 (catalogue of spp.); Bull. 
Wis. Nat. Hist. Soc., (2) 9, pp. 91-134, 1911; monograph of 
spp. Ibid., (2) 13, pp. 49-61, 1915; additions. 
Syn. Tetragoneura SELYS, Bull. Acad. Belg., (2) 31, p. 259, 1871. L. c., 
(2) 45, p. 207, 1878. 
basiguttata SELYS, MARTIN, syn. ad cynosura. 
calverti MUTTKOWSKI, forma sub semiaquea. 
