no. 2089. NOTES ON NEOTROPICAL DRAGON FLIES— WILLIAMSON '. 621 



Prothorax. — Male. Black; a large orange (red in life) spot on the 

 middle lobe, slightly narrower at the middle and divided by the 

 merest line of black; hind lobe slightly emarginate at the center. 



Female. Black; a light yellow spot on the side of each lobe, form- 

 ing an interrupted lateral stripe, which is continued onto the meso- 

 thorax by a spot on the mesothoracic lamina; hind lobe convex. 



Thorax. — Male. Black; mesepisternum with a large triangular 

 orange (red in life) spot below; this spot is about half the length of 

 the mesepisternum and below attains nearly the full width of the 

 mesepisternum, reaching the humeral suture and separated from its 

 fellow on the opposite side narrowly by black in the middorsal line; 

 the black inclosed between the orange spots is triangular in shape, 

 the apex below; an isolated, short and wide band of pale bluish on 

 the metepisternum, surrounding the metastigma; metepimeron pale 

 bluish below for its entire length, the pale encroaching most on the 

 black near the middle of the second lateral suture, which however 

 is not reached by the pale area; metasternum pale flesh, a black 

 transverse band just posterior to the third coxae. 



Female. Black; middorsal carina and a narrow humeral stripe 

 pale yellow, the latter more or less interrupted above at one or two 

 points ; metepisternum with a flesh colored or pale yellow area similar 

 to the same area in the male but more extensive; below similar to 

 the male. No mesostigmal spines or processes. 



Abdomen. — Male. Black; 1 and 2 each with a lateral, quadrate, 

 pale blue spot ; ventral edge of sides of segments 7-9 yellowish, wider 

 on 8, very narrow on the other two; 3-6 very long and slender, 4-6 

 each slightly longer than 3; these 4 segments make up over three- 

 fourths the total length of the abdomen. Appendages black, the 

 superiors brown at the middle. 



Female. Black; 1-2 similar to the male; very narrow basal rings 

 on 3-6; a narrow ventral edge of yellowish on sides of 6-9, wider on 

 8 and 9. Genital valves slightly exceeding 10, the long slender palps 

 slightly exceeding the conical black appendages, which are shorter 

 than 10. 



Legs. — Male. Coxae and the extreme base of femora flesh colored; 

 otherwise all black. 



Female similar to the male, but basal half (first legs) to two-thirds 

 (last legs) of the femora pale, the pale area with a median brown 

 patch. 



Wings clear and shining; stigma black in* the male, dark brown in 

 the female. The 3 antenodal costal spaces of the front wing of a 

 male are in length, respectively, 6, 3, 3 J in units of an eyepiece 

 micrometer; of a hind wing, 5f , 3, 3. In the front wing the total, 

 12 J, reaches from the nodus almost to the eighth postnodal; in the 

 hind wing the total, llf, reaches to just beyond the seventh post- 

 nodal. In the front wing of a female the spaces measure 5, 2'i, 3§; 



