386 gundlach's work on the odonata of cuba 



Width of black mid-dorsal thoracic stripe .7-.77, of pale antehumeral .28-. 35, 

 of black humeral .42-.49 mrh. 



Second lateral thoracic suture with a black stripe on the upper three-fourths 

 or two-thirds of its length, the stripe continued as a line for the rest of the 

 suture. 



9 . Mesostigmal lamina chiefly black, near its hind edge with a yellow 

 line, hence both margined with the ])lack of the mid-dorsal and humeral stripes 

 and with a black spot on itself at its lateral end. 



Mesepisternal tubercles present. 



Width of the black mid-dorsal thoracic stripe .84-.91, of pale antehumeral 

 .18-.21, of black humeral .48-.56 mm. 



Second lateral thoracic suture with a black line for its whole length, wi'den- 

 ing into a narrow stripe in the upper two-thirds or three-fourths. 



Black on dorsum of abdominal segment nine of uniform width. 



Abdomen c? 24-26, 9 25.5-26.5; hind wing d' 15.5-17, 9 17-18; costal edge 

 of stigma, front wing, cf .49-.56, 9 .56-.63 mm. 



Material examined: Massachusetts, Sherborn, 1897, taken by A. L. Bab- 

 cock, Scf'. New Jersey, Hammonton, August 23, 1 9 ; Clementon, July 22, 

 3d', 1 9 ; May's Landing, August 25, 4 d", 3 9 (2 of the 9 in cop.) ; all in 1899, 

 taken by P. P. Calvert: Manahawkin, Aug. 5, 1912, 1 o^ taken by H. S. 

 Harbeck . 



On Gynacantha ereagris Gundlach and its Allies 



Of the four Cuban species of Gynacantha mentioned by Gund- 

 lach, trifida, septhna, gracilis and ereagris, he did not possess 

 septima, so that his description thereof is a translation of Hagen's 

 of 1861. His "gracilis Burm. " =?iervosa Ranibur. A compari- 

 son of his own descriptions of the three species which he had, 

 in as far as they include the same parts of the body, gives these 

 differences : 



trifida — Head anteriorly greenish, with a [black] T-spot above. 



Eyes above obscure blue, below yellowish brown. 



Thorax blackish brown, mesothorax with a lateral, longitudinal, wedge- 

 shaped (point toward the head) ray and the sides green, the latter with three 

 blackish brown bands from the base of the wings to that of the legs. [Sides 

 of the mesothorax means here the mesepimeron, metapleuron and part of the 

 mesepisternum.] Metathorax with small green spots arranged thus, 1, 3, 2, 3, 1. 



Abdomen: segment one black with two green spots on each side, segment 

 two with the intermedian [mid-dorsal, longitudinal] line and three transverse 

 bands green, following segments black with two small transverse spots at the 

 middle (jf each segment and two more rounded at the posterior border, the 

 former (not the latter as Ouiidlach says) almost disappearing on eight and 

 liacking on nine and ten. 



nervosa — ( 9 only) — Mouth and face very clear olive brown, frons with a 

 blackish brown intermediate [mid-dorsalj line above. [A black T-spot on the 



