PHFLIP P. CALVERT. 



65 



The following description is based on these two types; they differ 

 slightly from each other ; the M. C. Z. type is tlie larger. 



9 types. Vertex luteous, apex truncated. Face and lips yellow, a narrow 

 black band on frons superiorly in front of vertex and eyes; inner margin of 

 lateral labial lobes Hnd a narrow median stripe on the niedian labial lobe blackish. 

 Eear of eyes yellow with two black spots. Occiput luteous. Distance in which 

 the eyes are in contact equal to the median, antero-posterior dimension of occiput. 



Prothorax blackish, some yellow spots on either side above the bases of the 

 first legs. Hind lobe quite small, smaller than the other lobes, hind margin entire. 



Thorax luteous al)ove, becoming yellowish on the sides below and on the i)ectus ; 

 the upper and lower ends only of the humeral suture, an oblique stripe on the 

 lower part of the niesepimeron, a stripe on the site of the (obliterated ) first lateral 

 suture (not reaching the wing base however), a stripe on the second lateral suture, 

 a stripe along the median side of the latero-ventral metathoracic carina, uniting 

 with the preceding below and on the pectus with its fellow of the other side. — 

 blackish. 



Feet blackish : coxse. trochanters, first and second femora interiorly yellowish ; 

 third tibia? with 12-14 anterior (external) 13-15 postei'ior (internal^ slender spines. 



Abdomen luteous; sutures, transverse carinse (one supplementary transverse 

 carina on both 2 and 3) a narrow mid-dorsal and two lateral longitudinal stripes 

 on 2-3. latei'al margins of 3-7, 8-10 entirely (except two small, basal, luteous spots 

 on 8) — blackish. 



Appendages blackish, longer than 10. Vulvar lamina neither produced nor 

 excavated. 



Wings slightly smoky. Pterostigma blackish-brown, surmounting one and 

 parts of two other cells. Membranule small, pale. One submedian cross-vein 

 nearer the base than is the first antenodal, upper end of the arculus between first 

 and second antenodals, sectors of the arculus stalked, nodal sector not waved, no 

 hypertrigonals, one to three double cells between subnodal and next suppleiuentaiy 

 sector below. 



Front wings: 11-12 antenodals, last not continued to median vein; 8 postno- 

 dals ; internal triangle 3-celled, discoidal triangle with one cross-vein; 3 post- 

 triangular rows to beyond the level of the nodus. A faint yellowish, basal tinge 

 reaching to the apex of the submedian space i Halle type), or confined to the 

 extreme base of the wing (M. C. Z. type). 



Hind wings : 8-9 antenodals, 9 (right) 10 (left) postnodals, no internal triangle, 

 discoidal triangle free, its inner side barely nearer the base than the arculus is, 

 two posttriangular rows increasing, sectors of the triangle barely (Halle type), 

 or distinctly (M. C. Z. type) separated at origin. Faint yellowish basal tinge 

 reaching outward to the triangle (Halle type), or to the level of the first ante- 

 nodal, and backward to two cells beyond the apex of the membranule (M. C. Z. 

 type). 



Total length 30-34.5 mm., abdomen 20-23, third tibia 4.5 5, front wing 26-28.5, 

 hind wing 25-28, i)terostignia 3, abdominal ajipendages .75. 



Are the females of L. JuemaUna from Mauritius, Bourbon and 

 Madagascar described by Rambur (Nevr. p. 85) this species? 



As above indicated lateralis is not an Orthetrum, as given in IVIr. 

 Kirby's Catalogue, page 38. 



TRANS. AM. KNT. SOC. XXV. (9) SEPTEMIIER. 1898. 



