Oomphine Dragon/lies from South America, 135 



light no differentiating characters of greater value than the 

 following : — 



G. calverti. 



(1) Meso-metathorax with a 

 second antehumeral green stripe, 

 about half as long as the first, very 

 narrow, linear in front, almost 

 touching posteriorly the ante-alar 

 ridge, lying a little above the 

 humeral suture. 



(2) The pale basal colour on 

 abdominal segments 4-7 inter- 

 rupted mid-dorsally, and therefore 

 divided into spots. 



(3) Expansion of inferior lateral 

 margin of" segment 8 smaller, not 

 rounded ; that of 9 not very pro- 

 nounced, parallel and co-extensive 

 with the long axis of the segment. 



(4) Upper anal appendages with 

 the two inferior processes more 

 obtuse ; the superior subapical 

 sinuation longer. 



(5) Fore wings with 18-19 ante- 

 nodals, 10-13 postnodals. Hind 

 wings with 13-14 autenodals. 



(6) Abdomen 37'5 mm. ; hind 

 winff 28 mm. 



G. camposi. 



(1) Meso-metathorax without a 

 second antehumeral green stripe. 



(2) The pale basal colour on 

 abdominal segments 4-7 not inter- 

 rupted mid-dorsal] y, and therefore 

 not divided into spots. 



(3) Expansion of inferior lateral 

 margin of segment 8 larger, strongly 

 convex ; that of 9 more pi^onounced 

 than in calverti, regularly convex. 



(4) Upper anal appendages with 

 the two inferior processes more 

 acute ; the superior subapical 

 sinuation shorter. 



(5) Fore wings with 20-22 ante- 

 nodals, 13-14 postnodals. Hind 

 wings with 16 autenodals. 



(6) Abdomen 43 mm. ; hind 

 wing' 32 mm. 



It was realized that differences of this description might 

 lnse their significance, if sufficient material of both species 

 became available for study, and, with a view to throwing 

 further light upon the question at issue, Dr. Calvert prepared 

 and sent me camera lucida drawings of the penis and accessoiy 

 genitalia of G. camposi (PI. VII. figs. 8 & 9), for comparison 

 with the corresponding structures in Kiiby's type. The 

 liamulesdid not seem to be conspicuously different, but, when 

 the penis of G. calverti came to be dissected out and com- 

 pared with the figure of G. camposi, a state, of things was 

 disclosed which removed all reasonable doubts on the score 

 of specific distinctness. The camera lucida drawings repro- 

 duced as figs. 7 and 8 show the remarkable difference in form 

 and proportion of each of the three joints of which the penis is 

 composed, and especially the enormous disparity in the length 

 of the lateral lobes of the third joint. The vesicle of the 

 penis, too, is widely different in the two species. It may be 

 pointed out that the drawing of G. camposi appears to have 

 been made from the penis extended, but still in situ, while 

 that of G. calverti was made from the organ after it had been 

 dissected out. 



