192 :\rr. W. F. Kiiby o/i 



Genus MiSTHOTUS, nov. 



Eyes contiguous, scarcely expanded behind, frontal tubercle 

 rounded ; abdomen about as long as the fore wings, ratlier 

 slender, neither thickened nor constricted at the base, with 

 the second and third segments carinatcd ; terminal appendages 

 of male rather short and slender, thickened towards the 

 extremity, scarcely longer than the broad triangular lower 

 appendage : fore wings with 11 or 12 continuous antenodal 

 cross-nervures and 9 to 11 postiiodal cross-nervures in tiie 

 upper space and 7 or 8 in the lower (only 5 in female) ; 

 })terostignia rather long, with 2 or 3 nervures in the space 

 below it; only 1 nervure in the lower basal cell; no supra- 

 triangular nervures; triangle regular, traversed, followed by 

 3 rows of post-triangular cells, only increasing towards the 

 extremity^ subtriangular space consisting of ?> cells ; sectors 

 of the arculus stalked, only slightly waved, lower sector of 

 the triangle rising just beneath the triangle : hind wings with 

 9 or 10 continuous antenodal cross-nervures (sometimes an 

 accessory one in the u|)per series), and 11 postnodal upper 

 cross-nervures and 8 lower; triangle untra versed, followed by 

 two rows of cells increasing above the upper sector, which 

 rises close to the lower one. 



Differs from Orthctrum chiefly by the uninflated and 

 unconstricted abdomen. Several species desciibed under 

 (h-thctniin (among others 0. Jiavidulum^ Kirb.) will probably 

 fall into this genus. 



Misthotus Marti/iaUi, s]). n. 



Exp. al. 58 mm.; long. pter. 3 mm. ; long. corp. 31 mm. 



JlJa/e. — Head black ; vertex pur])le, coarsely punctured ; 

 below it a yellow spot on each side, touching the eye ; 

 mentum with the sides broadly yellow ; outer orbits yellow, 

 spotted with black ; thorax and abdomen })ruinose blue, with 

 some slight yellow markings at the base of the legs, on the 

 sides of the base of the abdomen beneath, and on the lower 

 abdominal a})pendage above; thorax very hairy ; legs black : 

 wings very clear hyaline, with blaekisli neuration; stigma 

 dark brown, slightly bordered with smoky yellow on the inner 

 edge ; base of wings with a smoky yellow patch, nearly 

 obsolete on the fore wings ; membranule of hind wings small, 

 grey. 



KSallsbury, Nov. and Dec. 1903. Two specimens. 



Female (taken in cop. with one of the two males described 



