Vol. XXVlii] ENTOMOLOGICAL NEWS. 259 



Studies on Costa Rican Odonata. 



VIII. A New Genus Allied to Cora. 

 By PHILIP P. CALVERT, University of Pennsylvania, 



Philadelphia, Pa. 



In our recent book on Costa Rica* we have referred (page 

 255) to the capture, at Peralta, August 8, 1909, of "a medium- 

 sized dragonfly, of an apparently new genus allied to Cora." 

 Only a single male was obtained in spite of search in the same 

 locality on following days in August and in March, 1910. The 

 insect is evidently distinct from Cora, although the latter is its 

 closest known ally. Mr. E. B. Williamson has very recently 

 obtained a long series of the same genus, and possibly the same 

 species, in Colombia, some specimens of which he has kindly 

 sent me for examination, so that the recognition of this form 

 as generically distinct seems thoroughly justified. The fol- 

 lowing account is based on the Costa Rican specimen, leaving 

 to Mr. Williamson the future description of his Colombian 

 material. 



MIOCORAf new genus. 



Possessing these characters of the legion Thore of Selys, 

 viz. : Upper and lower sectors of the arculus (Mi-3 and M4) 

 separating from the upper (anterior) end of the arculus ; 

 proximal side of the quadrilateral much longer than the distal, 

 its anterior (upper) side concave, costal and subcostal series 

 of antenodals subequal in number but not coinciding in position 

 in most cases; quadrilateral and median cell (M) cross-veined, 

 the former shorter than the latter ; and the following charac- 

 ters of the genus Cora Selys, viz. : M3 unbranched, no sup- 

 plementary sectors between M4 and Cui, and only one ante- 

 nodal cross-vein (here the 8th or 9th, front wings, 9th or 

 loth, hind wings, of the costal series) thicker than the others. t 



*A Year of Costa Rican Natural History by Amelia Smith Calvert 

 and Philip Powell Calvert, New York. The Macmillan Company, 1917. 



fGreek p-uw, less, and Cora, in allusion to the reduced venation 

 in comparison with that genus. 



tin the Colombian specimens the thickened antenodal varies from 

 the gth to the I4th, front wings, 8th to I3th, hind wings. 



