XXXI, '20] ENTOMOLOGICAL NEWS 255 



although the sun was shining. We revisited these same swampy spots 

 but not a single individual of the bright red species of dragonfly nor one 

 of the peculiar frogs was to be seen there ... "t 



On March 4, 1910, this species was at a tank in a coffee 

 plantation at Cachi and on March 5, by stagnant pools near 

 the bank of the Rio Reventazon near Cachi; on March 9 

 and 10 it was not found at these two places respectively 

 although the days were sunny. 



The dates at which this species was observ^ed at localities 

 other than the vicinity of Cartago and Cachi were: Septem- 

 ber 25, Laguna Ochomogo; December 4, La Carpintera; 

 December 9, Alajuela and vicinity; March 17, east of Tres 

 Rios. 



On April 21, 191 6, Professor Anastasio Alfaro, Director 

 of the Museo Nacional de Costa at San Jose, who has done 

 so much to advance scientific knowledge of that country, 

 collected some Sympetra on the Volcano Poas. These at 

 first sight appeared to be intermediate between S. illotum 

 virgula and S. illotum gilvum, but a detailed study apparently 

 justifies their recognition as a distinct species for which I pro- 

 pose the name 



Sympetrum nigrocreatum n. sp. 



Similar to S. illotum virgula Selys but differing as follows: Size larger. 

 Range of length of abdomen cT, 26-28 mm. (22-25*), ? > 26-28 (21-23); 

 average cf 27.045 (23.33), 9 27.14 (22.6) mm. Range of length of hind 

 wing cf 30-33 (26-29), ? 31-34 (27-30); average cf 31-72 (27-41), 9 

 32.35 (28) mm. 



No additional transverse carina on abdominal segment 4 in cf, except 

 in one cf in which it is low but distinct (present, distinct), but present 

 in the 9 (present, distinct). 



tA Year of Costa Rican Nat. Hist., pp. 73,74. 



*The figures and other statements enclosed in parentheses in this de- 

 scription are those obtained from 12 cf, 5 9 of 5. illotum virgula and 

 intermediates between it and S. illotum illotum on one hand and S. illotum 

 gibrum on the other, from the seven Costa Rican localities mentioned on 

 page 249. They are given immediately after the corresponding figures 

 for 5. nigrocreatum which latter are based on 11 cf , 7 9 • Where percent- 

 ages of variation are given, as for venational characters, each wing, fore 

 or hind, =. 2.777 % for nigrocreatum and 2.941 % for S. illotum virgula 

 and intermediates. 



