ODONATA OF BAJA CALIFORNIA, 497 



to be " two-branched, external branch conical, straight, 

 internal branch longer flat," a form of appendage quite 

 different from that described for ■perparva by de Selys. 

 The inferior appendages of dejixum are " unguiculated, 

 longer, oblique, recurved," an expression similar to that 

 employed for Ranihurii (p. 76) and therefore hardly 

 likely to have been applied to such a trifid or bifid ap- 

 pendage as exists in perparva. 



3. Lastly it is believed that a comparison of Ilagen's 

 original descriptions of defixuni and creduhun, justifies 

 the assertion that both apply to the same insect, since it 

 has been shown under J<.chniira Ramburii var. crcdula 

 (see ante in this paper) that the extent of the black on 8 

 and 9 is a variable quantity. Since credulum is recog- 

 nized as not specifically distinct from Ramburii Selys 

 {iners Hagen, 1861), dcfixum Hagen must also be referred 

 there. 



Distribution oi pcrparva Selys (dr/ixa Selys). Califor- 

 nia, Washington (Olympia, June 4, 1893, by Mr. Trevor 

 Kincaid), Colorado (Denver, by Mr. E. V. Beales), Texas 

 (Mr. S. F. Aaron). (Collections of Amer, Ent, Soc. 

 and P. P. Calvert). 



12. ISCHNURA CERVULA SclyS. PI. XV, fig. 3. 

 /. c. Selys, Bull. Ac. Belg. (2) xli, p. 262, 187(). 

 1 6 Comondu, Baja California, March, 1889, CD. Haiues. 

 2$ 19 San Ignacio, Baja California, April, 1889, C. D. Haines. 

 4 5 1? California (Calif. Acad, coll.) 

 1 S Mendocino Co., Calif. (Am. Ent. Soc. coll.) 



$ Black with a metallic lustre, the following blue or 

 green: lips, except a transverse, basal, black, labral 

 stripe; rhinarium, frons, gen£e, head beneath, a very 

 small, isolated postocular spot each side; two small spots 

 on each side of thoracic dorsum, representing respectively 

 the upper and lower ends of an antehumeral stripe; sides 



