494 CALIFORNIA ACADEMY OF SCIENCES. 



postocular spots confluent behind with yellow of rear of 

 head; a complete, luteous, antehumeral stripe leaving a 

 much narrower black humeral stripe, lateral thoracic 

 sutures each with merely a short, superior, black line: 

 1-2 and 8-9 black, articulations of 1-2, 7-8, 8-9 yellow- 

 ish; abdomen beneath and valvules luteous; appendages 

 blackish, half as long as 10; apical ventral spine on 8 

 distinct but small; pterostigma similar on all the wings, 

 pale luteous, some double cells beyond it on the hind 

 wings. 



Abdomen $ 17.5-20, ? 21.5. Hind wing 12-13. 5, 



?I5;5- 

 It is not certain that this female is of the same species 



as the males, but it was the only Agrionine female, other 



than A rgy'a v/v/da, received from Mr. Truman, and the 



two males oiexstriata were the only Agrionine males (other 



than Argia vivida) received from him. 



IscHNURA PERPARVA (McLachlan MS.) Selys. PI. xv, 

 fig. 4. 



/. p. Selys, Bull. Ac. Belg. (2) sli, p. 263, 1876. /. defixa Selys, 

 I. c, p. 261. 



Baron de Selys described an " Ischmtra defixa Hagen," 

 as allied to perparva, and which he doubtfully considered 

 to be the same as Agrton defiximi Hagen, Syn. Neur. 

 N. A. p. 80. It is here contended: i. That defixa 

 Selys and perparva are not distinct species; 2, that de- 

 flxum Hagen is different from these two forms, and 3, is 

 a variety of Ranihnrii Selys, not distinct from variety 

 credula Hagen. 



I. De Selys' description of his defixa is comparative 

 only, that of perfarva is detailed, and from it the im- 

 portant characters common to both maybe learned, viz.: 

 Pterostigma oblique inside but not outside, almost rounded 

 beneath, surmounting almost one cell on the superiors, 



