388 



THE CANADIAN ENTOMOLOGIST 



The colour-characters of the males as seen in the dried speci- 

 mens may be tabulated as follows: — 



British Guiana Trinidad Guatemala 



Face grass green. 



Face grey-bluish green. 



T-spot, with distinct narrow T-spot with distinct narrow 

 stem. stem. 



A dark brown line on fronto- 

 nasal suture and base of 

 labrum. 



Thorax grass-green, a chocolate 

 streak in front of antealar 

 sinus and extending _ along 

 base of mid-dorsal carina. 



Green colour of thorax extend- 

 ing on abdomen not beyond 

 sides of seg. 1, shading into 

 ochre yellow on 2 and base of 

 3, posterior to which abdo- 

 men is orange-brown, darker 

 on each segment behind 

 transverse carina (golden- 

 brown in life). 



A dark brown line on fronto- 

 nasal suture, sometimes faint 

 and base of labrum. 



Thorax of a darker and colder 

 or more bluish-green with 

 similar markings. 



Green colour of thorax extend- 

 ing on abdomen to trans- 

 verse carina on 2, distal part 

 of 2 and 3 front of trans- 

 verse carina reddish-brown, 

 shading into dark-greenish 

 brown on the remaining seg- 

 ments (bluish-green in life). 



Face grayish olivaceous. 



T-spot reduced to a narrow 

 streak along frontal margin, 

 no stem. 



Such lines not distinctly pres- 

 ent. 



Thorax dark reddish-brown,- 

 with a dull greenish bloom 

 (dull green in life), scarcely 

 darkened in front of antealar 

 sinus and base of median 

 carina. 



Abd. segs. 1 and 2 apparently 

 concolorous with thorax. Seg. 

 3 anterior to transverse car- 

 ina clear reddish-brown, sha- 

 ding into dull dark greenish- 

 brown in the remaining segs. 

 (dull blue in life). 



The females in the dried condition are similar in colour to the 

 males from the same localities. In those from Trinidad the brown 

 line on the fronto-nasal suture is faint, as it is in some of the males. 



Structural characters. 



A careful search was made for structural characters particu- 

 larly in the genitalia of both sexes, the abdominal appendages of 

 the male and the wing-venation. The results were entirely nega- 

 tive, except in the venation, and even here no constant differentials 

 were found, nor anything approaching such characters. All that 

 could be detected was the presence of slight differences in the aver- 

 age number of certain cross-veins, cells, etc., as shown in the table 

 below. Only the males from British Guiana and Trinidad were in 

 sufficiently large series to be used for this purpose. 



In this analysis the following characters were specially noted 

 and tabulated: — 



1. Number of first antecubital veins. 



2. Number of first postcubital veins. 



3. Number of cubital cross-veins. 



4. Number of cross-veins in the triangle. 



5. Number of cross-veins in the supratriangle. 



6. Number of marginal cells between Rs and Ma. 



