12 ENTOMOLOGICAL NEWS. [Jan., '17 



applied to the other three species figured as having penes simi- 

 lar to that of llndcnii. I have so used it, though I should have 

 compared these species in other characters had I had time. A 

 good series of intermediate forms exists in the genus Cocna- 

 grion between the puella penis and such penes as are shown in 

 figs. 46-49. 



Of the two groups represented by lindenn and puella re- 

 spectively, the penes would seem to indicate relationship of the 

 Hawaiian Megalagrions with Cercion rather than with Cocna- 

 grion of the puella group. This agrees with McLachlan's ob- 

 servation* that the Hawaiian forms seemed more like lindenn 

 than any of the other Eurasian species. As the American 

 Coenagrions have penes which are aberrant forms of the 

 puella type, this agrees with what is thought concerning the 

 origin of the other peculiar Hawaiian genera : that these are 

 not North American in origin. 



My first paper showed that too much dependence cannot be 

 put on penile characters alone, nevertheless a study of these in 

 this case has thrown an interesting side light on this Hawaiian 

 problem. 



EXPLANATION OF PLATES II AND III. 



Drawings of the penes of Megalagrion, Cercion and Coenagrion, 

 being ventral and lateral views of the last two segments. 

 Figs. 1-2. Megalagrion pacificum (McLachlan). Northwest Koolau 

 Range, Oahu, Hawaiian Islands; 1500 ft. elevation. April, 1901. 

 R. C. L. Perkins coll. 



Figs. 3-4. Megalagrion xanthomclas (Selys). Honolulu, Oahu, Ha- 

 waiian Islands. Nov., 1900. R. C. L. Perkins coll. 

 Figs. 5-6. Megalagrion leptodemas (Perkins). Northwest Koolau 

 Range, Oahu, Hawaiian Islands; 1800 ft. elevation. April, 1901. 

 R. C. L. Perkins coll. 

 Figs. 7-8. Megalagrion amaurodytum var. pclcs (Perkins). Hawaii, 



Hawaiian Islands, 1901. Koebele coll. 

 Figs. 9-10. Megalagrion calliphya (McLachlan). lao Valley, Maui, 



Hawaiian Islands. 1902. R. C. L,. Perkins coll. 



Figs. 11-12. Megalagrion calliphya var. microdemas Kilauea, Ha- 

 waii, Hawaiian Islands. July, 1903. R. C. L. Perkins coll. 

 Figs. 13-14. Megalagrion cudytum (Perkins). Lihue, Kauai, Hawaiian 

 Islands ; 1000 + ft. elevation. R. C. L. Perkins coll. 



*Ann. and Mag. Nat. Hist. (5), Vol. 12, p. 240. 



