1893.] NATURAL SCIENCES OF PHILADELPHIA. 377 



THE ODONATE GENUS ORTHOLESTES. 

 BY PHILIP P. CALVERT. 



In Entomological News for December, 1891 (Vol. II, p. 199), I 

 briefly described an Odonate from Jamaica as Ortholestes clara 

 new genus and species, and added that a detailed description would 

 appear later. The present paper is a fulfillment of tbat promise. 

 Since then I have seen two additional specimens of 0. clara and 

 have found a new species, 0. abbotti, from Hayti. Ortholesies is an 

 Agrionine of the legion Lestes Selys. 



Generic Characters. — (1) Wings ceasing to be petioled about as 

 far in front of the basal post costal cross vein as the latter is long. 



(2) Median sector separating from the principal at less than one- 

 third the distance from the arculus to the nodus, the subnodal aris- 

 ing one cell after the median. 



(3) Quadrilateral distinctly trapezoidal, superior side longer 

 than one-half the inferior, (4) internal side one-third to one-fourth 

 the inferior. 



(5) Ultra-nodal sector unbroken or but very slightly angulated ; 

 (6) subnodal and short sectors hardly more angulated. 



(7) Nodal sector arising from two and a half to four cells after 

 the nodus. 



(8) No supplementary sectors between the median and short 

 sectors. 



(9) With supplementary sectors forming an irregular network 

 (7-16 marginal cells) between the subnodal and median sectors. 



(10) Pterostigma three times as long as wide. 



(11) Hairs of the feet long (more than twice as long as the spaces 

 separating them). 



(12) Prothorax with the hind margin rounded and but very 

 slightly, if at all, emarginated in the middle. 



Until the publication of Ortholestes, the legion Lestes Selys was 

 known to contain but five ("sub-") genei*a: Megalestes of Southern 

 India, Archilestes of tropical America, the cosmopolitan Lestes, the 

 Paleearctic Sympycna, and Platylestes of Southern India. The genus 

 Ortholestes, while undoubtedly belonging to this legion, differs from 

 some of the minor legionary characters as laid down by De Selys 

 (Bull. Ac. Roy. Belg. (2) xiii, pp. 288-338, 1862) by those above 



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