ODONATA OF BAJA CALIFORNIA. 523 



2$ Comondii. 



San Jose del Cabo, not dated. 



San Jose del Cabo, September, 1893, G. Eisen. 



San Jose del Cabo, October, 1893, G. Eisen. 



Miratlores, September, 1894, Eisen & Vaslit. 



San Jose del Cabo, September, 1894, Eisen & Vaslit. 



323 a 253 ? 



At first it seemed that these specimens represented a 

 variety of riifinervis Burm., differing only as they do by 

 color and not by any structural characters. Upon Mr. 

 Henshaw's comparing a pair from San Jose del Cabo 

 with Dythemis at Cambridge, he wrote: "Appears to 

 me nearer to some specimens from Livingstone, Guiana, 

 placed with Dyth. stcrilis by Dr. Hagen than it does to 

 Dyth. riifinervis. I send you one of these by mail." 

 Further study of the specimen sent by Mr. Henshaw 

 leads the writer to adopt his conclusion. The following 

 description, however, having been previously drawn up, 

 is mainly comparative with that of Mr. Scudder (Proc. 

 Bost. Soc. N. H. X, p. 192, 1S66) for his vinosa = rufin~ 

 ervis. 



Frons usually "olivaceous yellow," brown above, la- 

 brum in some cases edged with black (Rambur's descrip- 

 tion, Ins. Nevr. p. 91, of conJuncta^= riifinervis, speaks 

 of the labrum as black), tip of the vertex slightly con- 

 cave, vertex and occiput olivaceous. Thorax brown, 

 mid-dorsal carina, a straight antehumeral and a sinuated 

 humeral stripe greenish -yellow; a transverse greenish- 

 yellow stripe, just in front of the antealar sinus, may or 

 may not connect with the two preceding stripes at their 

 upper ends, and extends almost to the mid-dorsal carina. 

 On the sides of the thorax greenish-yellow may occupy 

 the lower part of the mesepimeron, a stripe in front of the 

 second lateral suture and the greater part of the metepi- 

 meron ; or the brown may be reduced to a posthumeral 

 stripe, a stripe at the (obsolete) first lateral and one at 



