NO. 1710. NORTH AMERICAN DRAGONFLIEti— WILLIAMSON. 



375 



Abdominal appendages similar to those of txniolata, but seen in 

 profile the apices of the superiors are less curved and upturned, the 

 apical portion between the median external tooth and the apex less 

 inflated, approaching the form of illinoiensis; median lateral external 

 tooth present in every case. 



From j)acijica, which it resembles in color of costa, wahashensis is 

 separated at a glance by the shorter antehumeral stripe, the smaller 

 abdominal spots (on 3-6 scarcely one-third as large), and the ob- 

 scurely colored ventral surface of the apical segments, especially of 8. 

 Differences in the appendages exist, but are scarcely definable. 



From georgina it is separated at a glance by the obscure and 

 scarcely evident ventral markings on 7 and 9, which are isolated from 

 the dorsal spots. 



From both georgina and australensis it is separated by the brown 

 latero-ventral metathoracic carina, and it lacks the distinct pale ven- 

 tral basal areas on 8 and 9 of australensis. 



Fig. 4.— Wings of male Maceomia wabashensis, Bluffton, Indiana, August 6, 1905. 



Unfortunately I have been unable to take a female of this species. 

 Its habits at Blufl^ton seem indistinguishable from those of tseniolata, 

 with wdiich species and pacifica it is associated. The three species 

 are discussed under jjacijica. On living colors of txniolata and 

 wabashensis I have the following note: Eyes, Hooker's green above; 

 below, in front up to vesicle, and behind up to tubercle, dark nile 

 green; yellow markings, chrome yellow; thorax black, with metallic 

 green reflections; abdomen dead black, velvety in appearance. 



Type. — A male, in author's collection, taken at Bluft"ton, Indiana, 

 June 28, 1908. 



Material examined. — All collected by E. B. Williamson, Blufi'ton, 

 Indiana, June 15, 1902, male; August 6, 1905, male; August 8, 1905, 

 2 males; August 11, 1907, 2 males; June 28, 1908, male; July 10, 1908, 

 male; August 1, 1908, 2 males (1 P. P. C); total, 10 males. 



