380 PROCEEDINGS OF THE ACADEMY OP [1893. 



wing to the second ante-cubital, while in the other three genera it is 

 usually at two-thirds that distance. 



The ninth abdominal segment is at least twice as long as the tenth ; 

 the appendages are longer than the tenth. In Lestes the appendages 

 of the females are shorter than 10. 



Recently, I have expressed the opinion' 2 that the Calopteryginae 

 are to be looked upon as representing the most primitive of the liv- 

 ing subfamilies of the Odonata, that from them the Agrioninse are 

 descended, and that of the latter group the legion Lestes is phylo- 

 genetically the oldest. De Selys long ago suggested 3 that the Calop- 

 terygine genus Amphipteryx, of tropical America, stands in near 

 relationship to the Lestes. Whether we look upon Amphipteryx as 

 most nearly approaching the ancestral form of the Lestes or not, if 

 we accept the general phylogenetic series above sketched, Ortholedes 

 possesses more primitive characters than any other genus of its 

 legion in those above numbered 3, 5 and 6. If we go a step farther 

 and attach a direct ancestral importance to Amphipteryx, then may 

 we look upon characters 1,9 and 11 as relatively long inherited, 

 while 8 appears to be much more lately acquired and cpuite distinc- 

 tive of Ortholestes. 



Ortholestes clara Calvert, Ent. News IT, p. 199, 1891. 



$ . Head. Teneral : labrum, clypeus, middle only of top of 

 head brown with a slight metallic, bluish reflection; labium, man- 

 dibles, yellow; gense, sides of frons and vertex bright yellow, but 

 with a brown patch adjoining the margin of the eyes opposite the 

 vertex; antennre yellow. Adult: labrum, clypeus, frons and vertex 

 dark metallic blue or black, a small orange spot on the outer side of 

 each posterior ocellus, a pruinose spot around anterior ocellus, a 

 small pruinose postocular spot each side ; labium, mandibles except 

 at tips, gena?, pale luteous (perhaps yellow or even blue in life) ; 

 antenna? black, first and second articulations yellowish. 



Thorax. Teneral: brown; prothorax with a small yellow spot 

 each side on middle lobe, hind margin yellowish ; remainder of 

 thorax with the following yellow : an antehumeral stripe not attain- 

 ing the antealar sinus, a comjdete humeral stripe, a lateral stripe in 

 front of the metastigma with a small spot above, the two forming 

 a reversed ! all behind the second lateral suture, pectus. Adult: 



2 Tran=. Am. Ent. Soc. XX, p. 212, 1893. 

 3 Monog. Calopt. p. 241, 1854. 



