Zool— Vol. I.] CALVERT-ODONATA. 395 



31. Macrothemis inacuta Calvert. 



Plate XXV, Figs. 7, 10. 



Macrothemis inacuta Calvert, Proc. Bost. Soc. Nat. Hist., Vol. XXVIII, 

 1898, pp. 318, 32S (very brief diagnosis. ) 



Male. Vertex brown, tip metallic blue. Frons deeply grooved above, olive 

 or pale bluish in front, metallic blue just before the vertex and extending 

 down in a narrow limb on either side, anterior surface much pitted. Clypeus 

 luteous or olivaceous. Labrum luteous or with the free margin narrowly 

 black. Labium luteous or brown, darker on the median lobe and on the 

 adjoining parts of the lateral lobes. Occiput luteous, extending forwards 

 between the eyes so that the distance they are in contact is less than the 

 length of the occiput. Rear of the eyes brown with two pale green spots. 



Prothorax luteous. Thorax brown, a pale green antehumeral stripe each 

 side which is much and abruptly widened on the inner side at its upper end ; 

 humeral and lateral sutures with ill defined blackish stripes; a narrow, 

 oblique, pale green or yellow mesepimeral stripe interrupted in the middle 

 of its course; an oblong yellow or pale green spot on the metepimeron just 

 above the latero- ventral metathoracic carina, and a small, ill defined pale 

 cloud below the base of the hind wings. 



Legs luteous or brown, darker or even blackish inferiorly, spines of the 

 posterior (inner) row of the third tibiae shorter, stouter, and slightly more 

 numerous (16) than those of the anterior row (13). 



Abdomen of almost uniform width, very slightly narrower at 3; luteous, 

 articulations and carinas with black lines, 3-9 with an ill defined brownish 

 stripe from base to middle on 3, nearly to apex on 4-9, on either side of the 

 dorsum, ventral surface darker. 



Superior appendages almost as long as 9+10, slightly arched, apex rounded, 

 not pointed, thicker before the apex, with an inferior conical tooth at three- 

 fourths the length from the base, this tooth being itself denticulated at tip. 

 Inferior appendage about one-seventh shorter, about twice as long as its 

 width at base, apex narrow, ending in the usual two upturned denticles. 



Genitalia of 2: anterior lamina slightiy less prominent than the hamule, 

 profile of the former conical, with a rounded apex. Hamule with its apical 

 half very slender and curved backwards and somewhat upwards to form 

 a hook. Genital lobe projecting about half as much, tapering, tip rounded. 



Wings with or without a faint yellowish hue, with a brown tinge at the 

 extreme base of the subcostal and median veins. Pterostigma blackish 

 brown (yellow in the Guatemala male), outer and inner ends oblique. Mem- 

 branule white. Front wings with thirteen to fourteen antenodals, seven to 

 eight postnodals, triangle free, internal triangle two-celled, two post-trian- 

 gular rows to the level of the nodus (three cells, then two rows in one wing 

 1 male) increasing to four to six marginal cells. Hind wings with nine to eleven 

 antenodals, eight to ten postnodals, two post-triangular cells, the upper usu- 

 ally reaching across the entire width of the field, then two rows to the level 

 of the origin of the subnodal sector increasing to nine to fourteen marginal 

 cells. 



